Appendix A - MWRA Member Communities named as Co-permittees

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Fact Sheet NPDES Permit No. MA0103284
2023 Reissuance
Appendix A: MWRA Member Communities named as Co-permittees
Page 1 of 5 
MWRA Sewer Member Communities 
and Co-permittees to NPDES Permit MA0103284 
with individual permit number 
Permit
Number 
Co-permittee Responsibilities 
MAC013284 Town of Arlington 
Water and Sewer Department 
51 Grove Street 
Arlington, MA 02476 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC023284 Town of Ashland 
Department of Public Works 
20 Ponderosa Road 
Ashland, MA 01721 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC033284 Town of Bedford 
Department of Public Works 
314 Great Road 
Bedford, MA 01730 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC043284 Town of Belmont 
Department of Public Works 
19 Moore Street 
Belmont, MA 02478 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC063284 Town of Braintree 
Department of Public Works 
P.O. Box 850903 
Braintree, MA 02185-0903 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC073284 Town of Brookline 
Department of Public Works 
333 Washington Street 
Brookline, MA 02445 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC083284 Town of Burlington 
Department of Public Works 
25 Center Street 
Burlington, MA 01803 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC103284 Town of Canton 
Department of Public Works 
801 Washington Street 
Canton, MA 02021 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC123284 Town of Dedham 
Department of Public Works 
55 River Street 
Dedham, MA 02026 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J.

Fact Sheet NPDES Permit No. MA0103284
2023 Reissuance
Appendix A: MWRA Member Communities named as Co-permittees
Page 2 of 5 
Permit
Number 
Co-permittee Responsibilities 
MAC133284 City of Everett 
Department of Public Works 
19 Norman Street 
Everett, MA 02149 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC143284 City of Framingham 
Department of Public Works 
110 Western Avenue 
Framingham, MA 01701 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC153284 Town of Hingham 
Department of Public Works 
25 Bare Cove Park Drive 
Hingham, MA 02043 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC163284 Town of Holbrook 
Department of Public Works 
50 N. Franklin Street 
Holbrook, MA 02343 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC173284 Town of Lexington 
Water & Sewer Department 
201 Bedford Street 
Lexington, MA 02420 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC183284 City of Malden 
Department of Public Works 
356 Commercial Street 
Malden, MA 02148 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC193284 City of Medford 
Department of PublicWorks 
21 James Street 
Medford, MA 02155 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC203284 City of Melrose 
Department of PublicWorks 
72 Tremont St. 
Melrose, MA 02176 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC213284 Town of Milton 
Deaprtment of Public Works 
629 Randolph Avenue 
Milton, MA 02186 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC223284 Town of Natick 
Director of Public Works 
75 West Street 
Natick, MA 01760 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J.

Fact Sheet NPDES Permit No. MA0103284
2023 Reissuance
Appendix A: MWRA Member Communities named as Co-permittees
Page 3 of 5 
Permit
Number 
Co-permittee Responsibilities 
MAC233284 Town of Needham 
Department of Public Works 
500 Dedham Avenue 
Needham, MA 02492 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC243284 City of Newton 
Department of Public Works 
1000 Commonwealth Avenue 
Newton, MA 02459 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC253284 Town of Norwood 
Department of Public Works 
566 Washington Street 
Norwood, MA 02062 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC263284 City of Quincy 
Department of Public Works 
55 Sea Street 
Quincy, MA 02169 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC273284 Town of Randolph 
Department of PublicWorks 
41 South Main Street 
Randolph, MA 02368 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC283284 Town of Reading 
Department of Public Works 
16 Lowell Street 
Reading, MA 01867 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC293284 City of Revere 
Department of PublicWorks 
321 Rear Charger Street 
Revere, MA 02151 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC313284 Town of Stoneham 
Public Works Department 
16 Pine Street 
Stoneham, MA 02180 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC323284 Town of Stoughton 
Department of PublicWorks 
950 Central Street 
Stoughton, MA 02072 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC333284 Town of Wakefield 
Department of Public Works 
1 Lafayette Street 
Wakefield, MA 01880 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J.

Fact Sheet NPDES Permit No. MA0103284
2023 Reissuance
Appendix A: MWRA Member Communities named as Co-permittees
Page 4 of 5 
Permit
Number 
Co-permittee Responsibilities 
MAC343284 Town of Walpole 
Department of PublicWorks 
135 School Street 
Walpole, MA 02081 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC353284 City of Waltham 
Water & Sewer Division 
165 Lexington Street 
Waltham, MA 02452 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC363284 Town of Watertown 
Department of Public Works 
124 Orchard Street 
Watertown, MA 02472 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC373284 Town of Wellesley 
Department of Public Works 
20 Municipal Way 
Wellesley, MA 02481 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC383284 Town of Westwood 
Department of PublicWorks 
50 Carby Street 
Westwood, MA 02090 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC393284 Town of Weymouth 
Department of PublicWorks 
120 Winter Street 
Weymouth, MA 02188 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC403284 Town of Wilmington 
Water & Sewer Division 
121 Glen Road 
Wilmington, MA 01887 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC413284 Town of Winchester 
Department of PublicWorks 
15 Lake Street 
Winchester, MA 01890 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC423284 Town of Winthrop 
Department of Public Works 
100 Kennedy Drive 
Winthrop, MA 02152 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J. 
MAC433284 City of Woburn 
Public Works Sewer Division 
50 North Warren Street 
Woburn, MA 01801 
Draft Permit Part I.C., Part I.E., Part
I.F., and Part I. J.

Fact Sheet NPDES Permit No. MA0103284
2023 Reissuance
Appendix A: MWRA Member Communities named as Co-permittees
Page 5 of 5 
MWRA Sewer Member Communities 
and CSO-responsible Co-permittees 
to NPDES Permit MA0103284 
with individual permit number 
Permit
Number 
Co-permittee Responsibilities 
MAC053284 City of Boston 
Boston Water and Sewer Commission 
980 Harrison Avenue 
Boston, MA 02119 
Draft Permit Part I.B., Part
I.C., Part I.D., Part I.E., Part
I.F., and Part I.J. 
MAC093284 City of Cambridge 
Department of Public Works 
147 Hampshire Street 
Cambridge, MA 02139 
Draft Permit Part I.B., Part
I.C., Part I.D., Part I.E., Part
I.F., and Part I.J. 
MAC113284 City of Chelsea 
Department of Public Works 
500 Broadway 
Chelsea, MA 02150 
Draft Permit Part I.B., Part
I.C., Part I.D., Part I.E., Part
I.F., and Part I.J. 
MAC303284 City of Somerville 
Department of Public Works 
17 Franey Street 
Somerville, MA 02144 
Draft Permit Part I.B., Part
I.C., Part I.D., Part I.E., Part
I.F., and Part I.J.

Fact Sheet NPDES Permit No. MA0103284
2023 Reissuance
Appendix B: Authorized CSO Outfalls and Responsible Party
Page 1 of 3 
Outfall No. 
Responsible
Permittee or Co-
permittee 
Receiving Water Latitude and
Longitude 
MWR003 Massachusetts Water
Resources Authority Alewife Brook 42° 22’ 8” N,
71° 3’ 39” W 
MWR010 Massachusetts Water
Resources Authority Charles River 42° 21’ 6” N,
71° 6’ 22” W 
MWR018 Massachusetts Water
Resources Authority Charles River 42° 21’ 10” N,
71° 5’ 15” W 
MWR019 Massachusetts Water
Resources Authority Charles River 42° 21’ 18” N,
71° 4’ 51” W 
MWR020 Massachusetts Water
Resources Authority Charles River 42° 21’ 24” N,
71° 4’ 34” W 
MWR023 Massachusetts Water
Resources Authority Charles River 42° 21’ 6” N,
71° 5’ 33” W 
BOS003 Boston Water and
Sewer Commission Boston Inner Harbor 42° 21’ 28” N,
71° 1’ 40” W 
BOS004 Boston Water and
Sewer Commission Boston Inner Harbor 42° 21’ 53” N,
71° 1’ 37” W 
BOS009 Boston Water and
Sewer Commission Boston Inner Harbor 42° 22’ 13” N,
71° 2’ 39” W 
BOS010 Boston Water and
Sewer Commission Boston Inner Harbor 42° 22’ 24” N,
71° 2’ 32” W 
BOS012 Boston Water and
Sewer Commission Boston Inner Harbor 42° 22’ 40” N,
71° 2” 32” W 
BOS013 Boston Water and
Sewer Commission 
Boston Inner Harbor
(Chelsea River) 
42° 23’ 3” N,
71° 2’ 22” W 
BOS014 Boston Water and
Sewer Commission 
Boston Inner Harbor
(Chelsea River) 
42° 22’ 58” N,
71° 1’ 38” W 
BOS017 Boston Water and
Sewer Commission Mystic River 42° 23’8” N, 
71° 4’ 8” W 
BOS019 Boston Water and
Sewer Commission Mystic River 42° 22’ 48” N,
71° 3’ 4” W 
BOS046 Boston Water and
Sewer Commission Muddy River 42° 20’ 30” N,
71° 5’ 34’ W 
BOS057 Boston Water and
Sewer Commission Boston Inner Harbor 42° 21’ 51” N,
71° 2’ 58” W 
BOS060 Boston Water and
Sewer Commission Boston Inner Harbor 42° 21’ 34” N,
71° 2’ 54” W 
BOS062 Boston Water and
Sewer Commission Fort Point Channel 42° 21’ 16” N,
71° 3’ 4” W 
BOS064 Boston Water and
Sewer Commission Fort Point Channel 42° 21’ 5” N,
71° 3’ 10” W 
BOS065 Boston Water and
Sewer Commission Fort Point Channel 42° 20’ 55” N,
71°3’ 16” W

Fact Sheet NPDES Permit No. MA0103284
2023 Reissuance
Appendix B: Authorized CSO Outfalls and Responsible Party
Page 2 of 3 
Outfall No. 
Responsible
Permittee or Co-
permittee 
Receiving Water Latitude and
Longitude 
BOS068 Boston Water and
Sewer Commission Fort Point Channel 42° 20’ 42” N,
71° 3’ 34” W 
BOS070 Boston Water and
Sewer Commission Fort Point Channel 42° 20’ 34” N,
71° 3’ 40” W 
BOS073 Boston Water and
Sewer Commission Fort Point Channel 42° 20’ 52” N,
71° 3’ 13” W 
BOS076 Boston Water and
Sewer Commission Reserved Channel 42° 20’ 23” N,
71° 2’ 31” W 
BOS078 Boston Water and
Sewer Commission Reserved Channel 42° 20’ 19” N,
71° 2’ 24” W 
BOS079 Boston Water and
Sewer Commission Reserved Channel 42° 20’ 31” N,
71° 2’ 8” W 
BOS080 Boston Water and
Sewer Commission Reserved Channel 42° 20’ 30” N,
71° 1’ 31” W 
BOS081 Boston Water and
Sewer Commission North Dorchester Bay 42° 19’ 57” N,
71°1’ 30” W 
BOS082 Boston Water and
Sewer Commission North Dorchester Bay 42° 19’ 47” N,
71° 1’ 49” W 
BOS084 Boston Water and
Sewer Commission North Dorchester Bay 42° 19’ 43” N,
71° 2’ 29” W 
BOS085 Boston Water and
Sewer Commission North Dorchester Bay 42° 19’ 40” N,
71° 2’ 43” W 
BOS086 Boston Water and
Sewer Commission North Dorchester Bay 42° 19’ 36” N,
71° 2’ 44” W 
CAM001 City of Cambridge Alewife Brook 42° 24’ 7” N,
71° 8’ 7” W 
CAM002 
• CAM002A 
• CAM002B
(temporarily
closed) 
City of Cambridge Alewife Brook 42° 24’ 4” N,
71° 8’ 10” W 
CAM005 City of Cambridge Charles River 42° 22’ 25” N,
71° 7’ 58” W 
CAM007 City of Cambridge Charles River 42° 22’ 24” N,
71° 7’ 37” W 
CAM009 
(temporarily
closed) 
City of Cambridge Charles River 42° 22’ 10” N, 
71° 07’24” W 
CAM011 
(temporarily
closed) 
City of Cambridge Charles River 42° 22’ 8” N, 
71° 07’ 4” W

Fact Sheet NPDES Permit No. MA0103284
2023 Reissuance
Appendix B: Authorized CSO Outfalls and Responsible Party
Page 3 of 3 
Outfall No. 
Responsible
Permittee or Co-
permittee 
Receiving Water Latitude and
Longitude 
CAM017 City of Cambridge Charles River 42° 21’ 53” N,
71° 4’ 35” W 
CAM401A City of Cambridge Alewife Brook 42° 23’ 44” N,
71° 8’ 38” W 
CAM401B City of Cambridge Alewife Brook 42° 24’ 4” N,
71° 8’ 10” W 
CHE003 City of Chelsea Mystic River 42° 23’ 13” N,
71° 2’ 27” W 
CHE004 City of Chelsea Mystic River 42° 23’ 12” N,
71° 2’ 21” W 
CHE008 City of Chelsea Chelsea River 42° 23’ 41” N,
71° 1’ 9” W 
SOM001A City of Somerville Alewife Brook 42° 24’ 9” N,
71° 8’ 6” W 
SOM007A City of Somerville Mystic River 42° 23’ 38” N,
71° 4’ 34” W

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter Flow Flow Flow Flow 
CBOD5/NH
3-N 
CBOD5/NH
3-N 
CBOD5/NH
3-N 
Monthly
Ave Daily Max 
Monthly
Ave ANNL AVG 
Monthly
Ave Weekly Ave Daily Max 
Units MGD MGD MGD MGD mg/L mg/L mg/L 
Effluent Limit Report Report Report 436 25 40 Report 
Minimum 201.7 235.7 195.4 246.5 3.5 4.6 7.5 
Maximum 568.2 1002.8 483.9 319.6 10.9 13.9 39.4 
Median 322.1 488.65 298.1 283.55 6.2 7.8 13.45 
No. of Violations N/A N/A N/A 0 0 0 N/A 
1/31/2018 353.9 723.1 305.1 277.1 8.8 11.9 16.5 
2/28/2018 378.1 521.8 365.6 279.8 8.2 9.6 14.2 
3/31/2018 493.3 950.4 405.5 282.9 6.5 8.5 18.7 
4/30/2018 425 808.4 370.2 279.9 6.6 8.5 22.3 
5/31/2018 323.2 442.5 316 278.3 7.6 10.4 20.2 
6/30/2018 266.7 424.3 250.6 272.7 6.1 6.2 8.1 
7/31/2018 256.5 490.5 240.6 271.2 7.2 12.1 39.4 
8/31/2018 273 432.6 248.8 274.2 4.7 5 9.6 
9/30/2018 296.3 491.8 247.6 277.2 4.7 5.7 12.4 
10/31/2018 321 564.9 291.6 284.2 4.9 7.4 23.3 
11/30/2018 568.2 795.8 483.9 296 5.2 6.4 15.7 
12/31/2018 382.9 617 359 307.9 6.3 8.4 11.3 
1/31/2019 372.5 792.4 343.3 311.2 9.5 12.2 19.4 
2/28/2019 368.7 488.5 329.8 309.5 10.9 10.4 19.6 
3/31/2019 375.4 500 370.1 312 9.6 13.9 17.2 
4/30/2019 420.3 754.7 346.5 309 5.7 7 12.2 
5/31/2019 361.7 460.5 355.2 312.3 6.4 6.5 13.3 
6/30/2019 303.7 401.1 284.2 316.4 6.7 8.1 10.6 
7/31/2019 304.7 471.4 274.5 319.6 4.4 6 12.8 
8/31/2019 271 477.8 250.9 318.8 5.5 7 13.3 
9/30/2019 243.6 355.7 233.1 315 5.7 7 14.4 
10/31/2019 276.3 512.1 244.4 310.8 5.5 6.4 13 
11/30/2019 294.2 560.3 268.5 300.4 6.1 7.3 13 
12/31/2019 420.8 724.6 415.9 294.5 5.6 6 14.3 
1/31/2020 333.9 468.9 332.7 294 6.2 8.8 13.5 
2/29/2020 320.9 416.3 300.3 292.8 6.9 8.8 11.8 
1 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter Flow Flow Flow Flow 
CBOD5/NH
3-N 
CBOD5/NH
3-N 
CBOD5/NH
3-N 
Monthly
Ave Daily Max 
Monthly
Ave ANNL AVG 
Monthly
Ave Weekly Ave Daily Max 
Units MGD MGD MGD MGD mg/L mg/L mg/L 
Effluent Limit Report Report Report 436 25 40 Report 
Minimum 201.7 235.7 195.4 246.5 3.5 4.6 7.5 
Maximum 568.2 1002.8 483.9 319.6 10.9 13.9 39.4 
Median 322.1 488.65 298.1 283.55 6.2 7.8 13.45 
No. of Violations N/A N/A N/A 0 0 0 N/A 
3/31/2020 325.3 536.7 299.2 286.6 7.4 8.7 13.5 
4/30/2020 432.2 638.9 401.3 290.5 6.3 7.3 11 
5/31/2020 331.4 552.7 309.7 288 7.2 9.8 11.8 
6/30/2020 251.9 382.6 236.3 282.9 6.8 9.3 12.7 
7/31/2020 234.9 297.6 229.8 277.9 5.1 6.9 16.5 
8/31/2020 213.3 298.7 206.8 273.2 5.4 6.8 18.8 
9/30/2020 204.1 253.6 199.8 268.6 5 5.9 14.6 
10/31/2020 237 412.2 202 264.8 5.5 6.8 13.4 
11/30/2020 278.4 568.3 242.8 262.8 5.4 6.2 15.5 
12/31/2020 428.2 908.7 387.2 267.3 5.9 10.2 29.9 
1/31/2021 331.6 544.5 314.9 266.7 5.9 9.5 16.5 
2/28/2021 329.4 438.6 289.3 265 7.3 9.5 13.1 
3/31/2021 306.9 394.5 297.8 265 6.8 7.9 10.6 
4/30/2021 346.2 677.4 309.6 260.4 6.4 8.2 18.3 
5/31/2021 333 488.8 291.2 257.8 5.1 8.5 17.7 
6/30/2021 290.9 411 280.2 262 4.8 5.6 10.5 
7/31/2021 490.6 1002.8 378.7 269.9 4.7 7.4 15.6 
8/31/2021 347.1 564.6 300.1 279.6 3.5 4.8 10.3 
9/30/2021 404.4 969.1 344.6 294.7 3.9 4.6 9.5 
10/31/2021 358.1 626.4 305.7 304.9 5.1 8.1 13.4 
11/30/2021 340 498.9 328.5 313.6 5.1 5.9 9 
12/31/2021 280.8 385 270.5 305 7.8 8.7 17.4 
1/31/2022 292.8 466 282.9 302.4 8.3 10.5 19.5 
2/28/2022 396.4 555 368.9 304.8 7.4 11.3 17.3 
3/31/2022 359 456.1 339.8 308.3 8.5 9.5 13 
4/30/2022 319.1 420.1 305.5 308 6.5 7.4 9.3 
2 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter Flow Flow Flow Flow 
CBOD5/NH
3-N 
CBOD5/NH
3-N 
CBOD5/NH
3-N 
Monthly
Ave Daily Max 
Monthly
Ave ANNL AVG 
Monthly
Ave Weekly Ave Daily Max 
Units MGD MGD MGD MGD mg/L mg/L mg/L 
Effluent Limit Report Report Report 436 25 40 Report 
Minimum 201.7 235.7 195.4 246.5 3.5 4.6 7.5 
Maximum 568.2 1002.8 483.9 319.6 10.9 13.9 39.4 
Median 322.1 488.65 298.1 283.55 6.2 7.8 13.45 
No. of Violations N/A N/A N/A 0 0 0 N/A 
5/31/2022 256 303.6 253.6 302.5 6.4 7 10.2 
6/30/2022 233.6 338.3 224.7 297 7.9 7.7 38.1 
7/31/2022 205.6 235.7 202.2 282.7 6.2 11.4 8.7 
8/31/2022 201.7 272 195.4 272 5.8 6.4 9.6 
9/30/2022 223.3 324.9 208.9 262.8 5.3 5.7 7.5 
10/31/2022 252.1 423.3 227.2 256.6 5.2 6.8 10.2 
11/30/2022 241 358.7 224.5 246.5 8.9 9 16.1 
12/31/2022 339.2 638.3 298.4 248.3 6.7 10 15.1 
3 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
CBOD5/NH3-N %
Removal TSS TSS TSS 
TSS %
Removal 
Solids,
settleable 
Monthly Ave 
Monthly
Ave Weekly Ave Daily Max 
Monthly
Ave Weekly Ave 
Units % mg/L mg/L mg/L % mL/L 
Effluent Limit Report 30 45 Report Report Report 
Minimum 89.2 6.1 7 14.6 85.7 0 
Maximum 97 20.7 24.8 66.3 97.3 0.1 
Median 94.7 9.8 13.15 25.9 94.85 0.01 
No. of Violations N/A 0 0 N/A N/A N/A 
1/31/2018 92.1 16.2 23 38.5 92.3 0.01 
2/28/2018 91.9 15 18.3 23 91.8 0.01 
3/31/2018 91.1 16 21.1 35.5 88.8 0 
4/30/2018 93.1 17.1 24.8 54.4 91.3 0.01 
5/31/2018 93.9 11.7 15.9 29.2 94.9 0.01 
6/30/2018 95.9 8.9 9.9 19.2 96.7 0.04 
7/31/2018 95.1 9.2 11.5 33.6 95.9 0 
8/31/2018 97.0 7.9 9.4 18.3 97.1 0 
9/30/2018 97.0 8.9 11 30.8 97.3 0.01 
10/31/2018 96.1 8.6 12.2 38 96.8 0 
11/30/2018 94.6 9.2 10.5 16.5 95.4 0.07 
12/31/2018 95.0 10.7 14.3 18.8 94.7 0 
1/31/2019 90.7 16.5 23.5 36.6 88.5 0 
2/28/2019 89.2 20.7 24.2 39.2 85.7 0 
3/31/2019 90.3 18.6 24.2 26.8 86 0.01 
4/30/2019 94.3 11.4 15.6 28 92.7 0.01 
5/31/2019 94.2 10.9 13 21.4 93.8 0 
6/30/2019 95.0 11.2 13.8 22.8 94.2 0.01 
7/31/2019 95.7 7.4 9 23.1 96 0.01 
8/31/2019 95.8 9.6 12.5 34.4 95.5 0.04 
9/30/2019 96.6 10.6 13.7 24.7 95.8 0.01 
10/31/2019 96.0 8.5 11 28.5 96 0.01 
11/30/2019 95.8 9.6 12.4 33.7 96.1 0 
12/31/2019 94.9 9.3 10.8 24.1 94.8 0 
1/31/2020 95.1 9.6 17.4 21.7 95 0 
2/29/2020 95.1 14.4 15.9 24.4 94.7 0.01 
4 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
CBOD5/NH3-N %
Removal TSS TSS TSS 
TSS %
Removal 
Solids,
settleable 
Monthly Ave 
Monthly
Ave Weekly Ave Daily Max 
Monthly
Ave Weekly Ave 
Units % mg/L mg/L mg/L % mL/L 
Effluent Limit Report 30 45 Report Report Report 
Minimum 89.2 6.1 7 14.6 85.7 0 
Maximum 97 20.7 24.8 66.3 97.3 0.1 
Median 94.7 9.8 13.15 25.9 94.85 0.01 
No. of Violations N/A 0 0 N/A N/A N/A 
3/31/2020 94.0 14.5 17.3 33.2 92.8 0 
4/30/2020 92.6 8.2 10.8 16.4 94 0.06 
5/31/2020 93.1 9.4 12.2 18.2 94.1 0.01 
6/30/2020 94.7 9.9 13.2 26.4 95.3 0.03 
7/31/2020 96.0 6.1 8.9 14.8 97.1 0 
8/31/2020 96.3 6.6 9.3 26.2 96.9 0 
9/30/2020 96.9 7.1 7 24.2 96.1 0 
10/31/2020 96.4 7.4 10.8 28.7 96.5 0.1 
11/30/2020 95.7 7.6 9.2 27 96 0.03 
12/31/2020 91.9 9.9 13.8 34.5 91.8 0.04 
1/31/2021 94.2 6.4 7.9 17.8 96.1 0.03 
2/28/2021 93.4 12.2 14.1 40 92.4 0 
3/31/2021 93.4 10.4 11.7 16 94.2 0.01 
4/30/2021 93.8 12.7 15.2 20.5 92.8 0.07 
5/31/2021 95 9.5 15.4 28 95 0.01 
6/30/2021 95.7 7.8 9.7 24.8 96.2 0.01 
7/31/2021 93.6 8.5 14.2 30.8 93.6 0.01 
8/31/2021 96.3 6.8 7.5 20 96.1 0.01 
9/30/2021 95.3 6.7 10.7 22.6 95.3 0.1 
10/31/2021 94.8 11.7 18.5 29 93.3 0.04 
11/30/2021 94.6 7 7.8 14.6 95.4 0.01 
12/31/2021 94.6 11.6 13.7 25.8 95.4 0.01 
1/31/2022 92.6 13.9 19.3 28 92.6 0.07 
2/28/2022 91.4 15 22.3 31 90 0 
3/31/2022 91.2 16.6 19.7 24.4 90.9 0.01 
4/30/2022 93.6 13.9 18.3 26 92.4 0.01 
5 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
CBOD5/NH3-N %
Removal TSS TSS TSS 
TSS %
Removal 
Solids,
settleable 
Monthly Ave 
Monthly
Ave Weekly Ave Daily Max 
Monthly
Ave Weekly Ave 
Units % mg/L mg/L mg/L % mL/L 
Effluent Limit Report 30 45 Report Report Report 
Minimum 89.2 6.1 7 14.6 85.7 0 
Maximum 97 20.7 24.8 66.3 97.3 0.1 
Median 94.7 9.8 13.15 25.9 94.85 0.01 
No. of Violations N/A 0 0 N/A N/A N/A 
5/31/2022 94.5 12.3 16.9 21.8 94.4 0.01 
6/30/2022 94.1 12.7 13.1 66.3 94 0 
7/31/2022 95.5 10.2 19.7 23.2 95.1 0 
8/31/2022 96 8.9 11 15.4 96.1 0 
9/30/2022 96.3 8.3 10.4 15.8 96.5 0 
10/31/2022 96.3 7.9 12.1 26 96.5 0 
11/30/2022 94.7 11 13.6 20.7 94.8 0 
12/31/2022 93.9 9.7 11.7 26 94.5 0 
6 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Solids,
settleable pH pH 
Fecal
Coliform 
Fecal
Coliform 
Coliform, fecal - %
sample exceeds limit 
Daily Max Minimum Maximum WKLY GEO Daily Max Maximum 
Units mL/L SU SU #/100mL #/100mL % 
Effluent Limit Report 6 9 14000 14000 10 
Minimum 0 6.2 6.8 5 8 0 
Maximum 0.6 6.6 7.2 26 341 2.2 
Median 0.1 6.5 6.9 8 27.5 0 
No. of Violations N/A 0 0 0 0 0 
1/31/2018 0.1 6.5 7 8 44 0 
2/28/2018 0.1 6.5 7 6 10 0 
3/31/2018 0 6.5 7 9 23 0 
4/30/2018 0.1 6.5 6.9 9 15 0 
5/31/2018 0.1 6.3 6.9 7 11 0 
6/30/2018 0.3 6.6 6.9 6 8 0 
7/31/2018 0 6.6 7.1 6 11 0 
8/31/2018 0.1 6.6 7 6 15 0 
9/30/2018 0.1 6.6 7 7 29 0 
10/31/2018 0 6.5 7 7 43 0 
11/30/2018 0.5 6.5 7 16 63 0 
12/31/2018 0 6.4 7.2 12 70 0 
1/31/2019 0 6.4 7.1 13 103 0 
2/28/2019 0 6.4 6.9 9 85 0 
3/31/2019 0.1 6.3 6.9 9 36 0 
4/30/2019 0.1 6.4 6.9 9 19 0 
5/31/2019 0.1 6.5 6.9 7 18 0 
6/30/2019 0.1 6.4 6.9 10 57 0 
7/31/2019 0.1 6.4 6.9 8 25 0 
8/31/2019 0.3 6.5 7 7 12 0 
9/30/2019 0.1 6.5 7.1 6 10 0 
10/31/2019 0.1 6.5 7.1 8 54 0 
11/30/2019 0 6.6 7.1 9 23 0 
12/31/2019 0 6.5 7 9 45 0 
1/31/2020 0 6.5 7 9 54 1 
2/29/2020 0.1 6.5 6.9 8 31 0 
7 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Solids,
settleable pH pH 
Fecal
Coliform 
Fecal
Coliform 
Coliform, fecal - %
sample exceeds limit 
Daily Max Minimum Maximum WKLY GEO Daily Max Maximum 
Units mL/L SU SU #/100mL #/100mL % 
Effluent Limit Report 6 9 14000 14000 10 
Minimum 0 6.2 6.8 5 8 0 
Maximum 0.6 6.6 7.2 26 341 2.2 
Median 0.1 6.5 6.9 8 27.5 0 
No. of Violations N/A 0 0 0 0 0 
3/31/2020 0 6.4 6.9 6 9 0 
4/30/2020 0.2 6.3 6.9 7 20 0 
5/31/2020 0 6.4 6.9 10 124 1 
6/30/2020 0.1 6.3 6.9 7 28 0 
7/31/2020 0 6.3 6.9 5 9 0 
8/31/2020 0 6.4 6.9 5 9 0 
9/30/2020 0.3 6.6 6.9 5 45 0 
10/31/2020 0.1 6.4 7.1 8 102 1.1 
11/30/2020 0.1 6.5 6.9 6 8 0 
12/31/2020 0.3 6.4 6.9 7 18 0 
1/31/2021 0.1 6.4 6.9 7 16 0 
2/28/2021 0 6.5 7 7 46 0 
3/31/2021 0.1 6.3 6.8 6 8 0 
4/30/2021 0.5 6.4 6.9 7 13 0 
5/31/2021 0 6.5 6.9 6 15 0 
6/30/2021 0.1 6.5 7 7 41 0 
7/31/2021 0.1 6.2 6.9 14 126 0 
8/31/2021 0.1 6.5 6.9 26 320 2.2 
9/30/2021 0.6 6.5 6.9 25 260 0 
10/31/2021 0.1 6.5 6.9 14 29 0 
11/30/2021 0.1 6.4 6.9 8 24 0 
12/31/2021 0.5 6.4 7.1 6 9 0 
1/31/2022 0 6.5 7 8 91 0 
2/28/2022 0.1 6.5 7 10 84 0 
3/31/2022 0 6.5 7 11 35 0 
4/30/2022 0.1 6.5 6.9 8 22 0 
8 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Solids,
settleable pH pH 
Fecal
Coliform 
Fecal
Coliform 
Coliform, fecal - %
sample exceeds limit 
Daily Max Minimum Maximum WKLY GEO Daily Max Maximum 
Units mL/L SU SU #/100mL #/100mL % 
Effluent Limit Report 6 9 14000 14000 10 
Minimum 0 6.2 6.8 5 8 0 
Maximum 0.6 6.6 7.2 26 341 2.2 
Median 0.1 6.5 6.9 8 27.5 0 
No. of Violations N/A 0 0 0 0 0 
5/31/2022 0.1 6.6 6.9 8 11 0 
6/30/2022 0 6.5 6.9 10 53 0 
7/31/2022 0 6.5 7 7 13 0 
8/31/2022 0 6.5 6.9 6 14 0 
9/30/2022 0 6.5 6.9 8 33 0 
10/31/2022 0 6.4 6.9 7 31 0 
11/30/2022 0 6.4 6.9 7 27 0 
12/31/2022 0 6.5 6.9 12 341 0 
9 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter TRC TRC Ammonia Nitrate Nitrite TKN 
Arsenic,
total (as As) 
Monthly
Ave Daily Max 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Units ug/L ug/L mg/L mg/L mg/L mg/L ug/L 
Effluent Limit 456 631 Report Report Report Report Report 
Minimum 0 0 12.82 0 0.03 13.68 0 
Maximum 2.15 53.33 39.31 1.17 1.53 41.25 0.849 
Median 0 0 24.89 0.155 0.44 26.3 0 
No. of Violations 0 0 N/A N/A N/A N/A N/A 
1/31/2018 0 0 28.08 0.12 0.2 28.7 0 
2/28/2018 0 0 21.74 0.08 0.17 23.86 0 
3/31/2018 0.86 13.33 16.9 0.43 0.68 18.36 0 
4/30/2018 0 0 21.66 0.27 0.44 21.58 0 
5/31/2018 0 0 25.29 0.15 0.35 25.42 0 
6/30/2018 0 0 32.84 0.06 0.04 33.66 0 
7/31/2018 0 0 29.6 0.11 0.22 28.22 0 
8/31/2018 0 0 29.88 0.11 0.99 28.97 0 
9/30/2018 0 0 28.59 0.05 0.17 26.28 0 
10/31/2018 0 0 26.33 0.08 0.35 26.32 0 
11/30/2018 0 0 12.91 0.27 1.47 13.68 0 
12/31/2018 0 0 18.43 0.19 0.83 19.56 0 
1/31/2019 0 0 22.55 0.16 0.95 26.5 0 
2/28/2019 0 0 22.89 0.16 1.04 25.4 0 
3/31/2019 0 0 24.27 0.11 0.57 25.32 0 
4/30/2019 1.78 53.33 22.17 0.39 1.41 21.98 0 
5/31/2019 0 0 21.91 0.26 1.08 23.73 0 
6/30/2019 0 0 30.29 0.06 0.33 34.14 0 
7/31/2019 0 0 25.66 0.13 0.75 25.55 0 
8/31/2019 0.54 16.67 27.53 0.06 0.51 32.66 0 
9/30/2019 0 0 33.93 0.07 0.44 37.46 0 
10/31/2019 0 0 33.44 0.13 0.66 36.35 0 
11/30/2019 0 0 26.59 0.1 0.17 27.82 0 
12/31/2019 0.54 16.67 19.9 0.21 1.44 19.96 0.65 
1/31/2020 2.15 43.33 22.56 0.17 1 24.58 0 
2/29/2020 0 0 24.46 0.13 0.21 27.7 0 
10 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter TRC TRC Ammonia Nitrate Nitrite TKN 
Arsenic,
total (as As) 
Monthly
Ave Daily Max 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Units ug/L ug/L mg/L mg/L mg/L mg/L ug/L 
Effluent Limit 456 631 Report Report Report Report Report 
Minimum 0 0 12.82 0 0.03 13.68 0 
Maximum 2.15 53.33 39.31 1.17 1.53 41.25 0.849 
Median 0 0 24.89 0.155 0.44 26.3 0 
No. of Violations 0 0 N/A N/A N/A N/A N/A 
3/31/2020 0 0 24.97 0.15 0.44 26.54 0 
4/30/2020 0 0 16.51 0.46 1.31 18.14 0 
5/31/2020 0 0 22.69 0.21 0.44 26.56 0 
6/30/2020 0 0 30.99 0.17 0.21 34.1 0 
7/31/2020 0 0 31.04 0.03 0.12 31.42 0 
8/31/2020 0 0 34.56 0.01 0.12 34.74 0 
9/30/2020 0 0 34.7 0 0.03 38.72 0 
10/31/2020 0 0 33.66 0 0.42 35.14 0 
11/30/2020 0 0 28.45 0.03 0.17 34.34 0 
12/31/2020 1.08 33.33 17.27 0.42 1.38 19.4 0.695 
1/31/2021 0.54 16.67 22.47 1.17 0.78 22.74 0 
2/28/2021 0 0 21.54 0.03 0.46 23.52 0 
3/31/2021 0 0 25.03 0.02 0.43 24.83 0 
4/30/2021 0 0 22.83 0.15 0.61 23.28 0 
5/31/2021 0 0 20.46 1.1 0.61 23.42 0 
6/30/2021 0 0 22.59 0.41 0.26 23.95 0 
7/31/2021 0 0 12.82 0.53 1.53 15.43 0 
8/31/2021 0 0 20.77 0.23 0.5 22.32 0 
9/30/2021 0 0 19.61 0.23 0.4 22.23 0.403 
10/31/2021 0 0 21.59 0.4 0.48 24.22 0.401 
11/30/2021 0 0 19.04 0.83 0.33 20.52 0 
12/31/2021 0 0 29.5 0.57 0.11 29.7 0 
1/31/2022 0 0 26.89 0.27 0.35 29.06 0 
2/28/2022 0 0 21.79 0.27 0.57 23.9 0 
3/31/2022 0.43 13.33 23.16 0.62 0.64 26.02 0 
4/30/2022 0 0 24.16 0.34 0.54 27 0 
11 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter TRC TRC Ammonia Nitrate Nitrite TKN 
Arsenic,
total (as As) 
Monthly
Ave Daily Max 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Monthly
Ave 
Units ug/L ug/L mg/L mg/L mg/L mg/L ug/L 
Effluent Limit 456 631 Report Report Report Report Report 
Minimum 0 0 12.82 0 0.03 13.68 0 
Maximum 2.15 53.33 39.31 1.17 1.53 41.25 0.849 
Median 0 0 24.89 0.155 0.44 26.3 0 
No. of Violations 0 0 N/A N/A N/A N/A N/A 
5/31/2022 0 0 28.59 0.86 0.36 31.78 0.473 
6/30/2022 0 0 33.38 0.92 0.1 36.5 0.439 
7/31/2022 0.43 13.33 34.77 0.05 0.16 41.25 0 
8/31/2022 0 0 39.31 0.01 0.33 38.7 0.451 
9/30/2022 0 0 31.13 0.14 1.5 36.6 0.849 
10/31/2022 0 0 33.31 0.06 0.26 33.74 0 
11/30/2022 0 0 35.63 0.12 0.58 32.32 0 
12/31/2022 1.51 23.33 24.81 0.32 0.44 23.34 0 
12 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Arsenic,
total (as As) Copper Copper 
Mercury, total (as
Hg) 
Mercury, total (as
Hg) 
Daily Max 
Monthly
Ave Daily Max Monthly Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 2.09 2.51 0.00205 0.00223 
Maximum 1.39 13.15 36.2 0.01143 0.0317 
Median 0 5.22 6.32 0.003595 0.004415 
No. of Violations N/A N/A N/A N/A N/A 
1/31/2018 0 6.85 7.42 0.00381 0.00472 
2/28/2018 0 6.96 8.72 0.00571 0.00952 
3/31/2018 0 7.97 11.4 0.00534 0.00662 
4/30/2018 0 6.83 8.02 0.00558 0.00617 
5/31/2018 0 6.65 6.81 0.006 0.00717 
6/30/2018 0 3.78 4.76 0.00346 0.00426 
7/31/2018 0 4.05 9.18 0.00413 0.0111 
8/31/2018 0 3.84 4.61 0.0027 0.00315 
9/30/2018 0 4.57 6.24 0.00279 0.00309 
10/31/2018 0 4.12 4.67 0.00301 0.00344 
11/30/2018 0 4.86 6.25 0.00398 0.00527 
12/31/2018 0 4.24 5.26 0.00377 0.00484 
1/31/2019 0 7.35 9.58 0.00444 0.00492 
2/28/2019 0 7.78 8.99 0.00555 0.00613 
3/31/2019 0 7.69 8.38 0.00623 0.00638 
4/30/2019 0 6.6 7.35 0.00512 0.00587 
5/31/2019 0 5.2 5.63 0.0033 0.0035 
6/30/2019 0 6.12 7.06 0.00639 0.00837 
7/31/2019 0 3.55 3.91 0.00228 0.00246 
8/31/2019 0 5 10.2 0.00754 0.013 
9/30/2019 0 4.32 5.12 0.00281 0.0032 
10/31/2019 0 5.24 6.51 0.0026 0.00279 
11/30/2019 0 4.25 4.77 0.00293 0.00344 
12/31/2019 1.3 4.48 5.33 0.00381 0.00617 
1/31/2020 0 4.06 5.57 0.00286 0.00368 
2/29/2020 0 5.93 8.83 0.00414 0.00489 
13 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Arsenic,
total (as As) Copper Copper 
Mercury, total (as
Hg) 
Mercury, total (as
Hg) 
Daily Max 
Monthly
Ave Daily Max Monthly Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 2.09 2.51 0.00205 0.00223 
Maximum 1.39 13.15 36.2 0.01143 0.0317 
Median 0 5.22 6.32 0.003595 0.004415 
No. of Violations N/A N/A N/A N/A N/A 
3/31/2020 0 6.82 7.94 0.00391 0.00439 
4/30/2020 0 4.71 5.85 0.00341 0.00394 
5/31/2020 0 5.75 6.94 0.00302 0.00326 
6/30/2020 0 5.4 5.99 0.00464 0.00556 
7/31/2020 0 2.09 2.51 0.00205 0.00223 
8/31/2020 0 5.11 5.62 0.00305 0.00367 
9/30/2020 0 4.56 4.84 0.00276 0.00322 
10/31/2020 0 4.67 5.37 0.003 0.00392 
11/30/2020 0 4.85 6.08 0.0035 0.00414 
12/31/2020 1.39 13.15 36.2 0.01143 0.0317 
1/31/2021 0 4.11 4.58 0.00256 0.00292 
2/28/2021 0 6.05 7.43 0.00369 0.00434 
3/31/2021 0 5.63 5.89 0.0042 0.00487 
4/30/2021 0 5.64 6.8 0.00495 0.00616 
5/31/2021 0 5.29 5.65 0.00379 0.00444 
6/30/2021 0 2.99 3.44 0.00395 0.00534 
7/31/2021 0 4.88 5.74 0.00349 0.00453 
8/31/2021 0 3.99 5.02 0.00348 0.00397 
9/30/2021 0.806 5.2 7.58 0.00299 0.00368 
10/31/2021 0.802 4.67 5.3 0.00309 0.00378 
11/30/2021 0 4.38 4.92 0.00259 0.00292 
12/31/2021 0 6.08 7.66 0.00309 0.00337 
1/31/2022 0 5.28 5.49 0.00336 0.00402 
2/28/2022 0 6.21 7.01 0.0042 0.00496 
3/31/2022 0 8 8.37 0.0087 0.0104 
4/30/2022 0 7.09 7.88 0.00611 0.00683 
14 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Arsenic,
total (as As) Copper Copper 
Mercury, total (as
Hg) 
Mercury, total (as
Hg) 
Daily Max 
Monthly
Ave Daily Max Monthly Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 2.09 2.51 0.00205 0.00223 
Maximum 1.39 13.15 36.2 0.01143 0.0317 
Median 0 5.22 6.32 0.003595 0.004415 
No. of Violations N/A N/A N/A N/A N/A 
5/31/2022 0.946 7.64 8.13 0.00599 0.00738 
6/30/2022 0.877 6.02 6.44 0.00302 0.00333 
7/31/2022 0 6.32 7.84 0.00398 0.00546 
8/31/2022 0.902 5.33 6.39 0.00399 0.00457 
9/30/2022 0.874 4.87 6.77 0.00335 0.00431 
10/31/2022 0 4.79 6.09 0.00299 0.00326 
11/30/2022 0 4.65 5.51 0.00291 0.00349 
12/31/2022 0 5.75 6.46 0.00339 0.0053 
15 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Cyanide, total
recoverable 
Cyanide, total
recoverable 
.gamma.-Chlordane,
whole water 
.gamma. - 
Chlordane, whole
water 
Monthly Ave Daily Max Monthly Ave Daily Max 
Units ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report 
Minimum 0 0 0 0 
Maximum 37 37 0 0 
Median 0 0 0 0 
No. of Violations N/A N/A N/A N/A 
1/31/2018 0 0 0 0 
2/28/2018 13 26 0 0 
3/31/2018 0 0 0 0 
4/30/2018 0 0 0 0 
5/31/2018 0 0 0 0 
6/30/2018 0 0 0 0 
7/31/2018 0 0 0 0 
8/31/2018 0 0 0 0 
9/30/2018 0 0 0 0 
10/31/2018 0 0 0 0 
11/30/2018 0 0 0 0 
12/31/2018 0 0 0 0 
1/31/2019 0 0 0 0 
2/28/2019 0 0 0 0 
3/31/2019 10 20 0 0 
4/30/2019 0 0 0 0 
5/31/2019 0 0 0 0 
6/30/2019 0 0 0 0 
7/31/2019 0 0 0 0 
8/31/2019 0 0 0 0 
9/30/2019 0 0 0 0 
10/31/2019 0 0 0 0 
11/30/2019 0 0 0 0 
12/31/2019 0 0 0 0 
1/31/2020 0 0 0 0 
2/29/2020 0 0 0 0 
16 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Cyanide, total
recoverable 
Cyanide, total
recoverable 
.gamma.-Chlordane,
whole water 
.gamma. - 
Chlordane, whole
water 
Monthly Ave Daily Max Monthly Ave Daily Max 
Units ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report 
Minimum 0 0 0 0 
Maximum 37 37 0 0 
Median 0 0 0 0 
No. of Violations N/A N/A N/A N/A 
3/31/2020 0 0 0 0 
4/30/2020 0 0 0 0 
5/31/2020 0 0 0 0 
6/30/2020 0 0 0 0 
7/31/2020 0 0 0 0 
8/31/2020 0 0 0 0 
9/30/2020 0 0 0 0 
10/31/2020 0 0 0 0 
11/30/2020 0 0 0 0 
12/31/2020 0 0 0 0 
1/31/2021 0 0 0 0 
2/28/2021 0 0 0 0 
3/31/2021 0 0 0 0 
4/30/2021 0 0 0 0 
5/31/2021 0 0 0 0 
6/30/2021 0 0 0 0 
7/31/2021 0 0 0 0 
8/31/2021 0 0 0 0 
9/30/2021 0 0 0 0 
10/31/2021 0 0 0 0 
11/30/2021 0 0 0 0 
12/31/2021 0 0 0 0 
1/31/2022 37 37 0 0 
2/28/2022 0 0 0 0 
3/31/2022 0 0 0 0 
4/30/2022 0 0 0 0 
17 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Cyanide, total
recoverable 
Cyanide, total
recoverable 
.gamma.-Chlordane,
whole water 
.gamma. - 
Chlordane, whole
water 
Monthly Ave Daily Max Monthly Ave Daily Max 
Units ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report 
Minimum 0 0 0 0 
Maximum 37 37 0 0 
Median 0 0 0 0 
No. of Violations N/A N/A N/A N/A 
5/31/2022 0 0 0 0 
6/30/2022 0 0 0 0 
7/31/2022 0 0 0 0 
8/31/2022 0 0 0 0 
9/30/2022 0 0 0 0 
10/31/2022 0 0 0 0 
11/30/2022 0 0 0 0 
12/31/2022 0 0 0 0 
18 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 4,4'-DDT 4,4'-DDT Aldrin Aldrin 
Chlordane (tech mix.
and metabolites) 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max Monthly Ave 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 0 0 0 0 
Maximum 0 0 0 0 0 
Median 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A 
1/31/2018 0 0 0 0 0 
2/28/2018 0 0 0 0 0 
3/31/2018 0 0 0 0 0 
4/30/2018 0 0 0 0 0 
5/31/2018 0 0 0 0 0 
6/30/2018 0 0 0 0 0 
7/31/2018 0 0 0 0 0 
8/31/2018 0 0 0 0 0 
9/30/2018 0 0 0 0 0 
10/31/2018 0 0 0 0 0 
11/30/2018 0 0 0 0 0 
12/31/2018 0 0 0 0 0 
1/31/2019 0 0 0 0 0 
2/28/2019 0 0 0 0 0 
3/31/2019 0 0 0 0 0 
4/30/2019 0 0 0 0 0 
5/31/2019 0 0 0 0 0 
6/30/2019 0 0 0 0 0 
7/31/2019 0 0 0 0 0 
8/31/2019 0 0 0 0 0 
9/30/2019 0 0 0 0 0 
10/31/2019 0 0 0 0 0 
11/30/2019 0 0 0 0 0 
12/31/2019 0 0 0 0 0 
1/31/2020 0 0 0 0 0 
2/29/2020 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 4,4'-DDT 4,4'-DDT Aldrin Aldrin 
Chlordane (tech mix.
and metabolites) 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max Monthly Ave 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 0 0 0 0 
Maximum 0 0 0 0 0 
Median 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A 
3/31/2020 0 0 0 0 0 
4/30/2020 0 0 0 0 0 
5/31/2020 0 0 0 0 0 
6/30/2020 0 0 0 0 0 
7/31/2020 0 0 0 0 0 
8/31/2020 0 0 0 0 0 
9/30/2020 0 0 0 0 0 
10/31/2020 0 0 0 0 0 
11/30/2020 0 0 0 0 0 
12/31/2020 0 0 0 0 0 
1/31/2021 0 0 0 0 0 
2/28/2021 0 0 0 0 0 
3/31/2021 0 0 0 0 0 
4/30/2021 0 0 0 0 0 
5/31/2021 0 0 0 0 0 
6/30/2021 0 0 0 0 0 
7/31/2021 0 0 0 0 0 
8/31/2021 0 0 0 0 0 
9/30/2021 0 0 0 0 0 
10/31/2021 0 0 0 0 0 
11/30/2021 0 0 0 0 0 
12/31/2021 0 0 0 0 0 
1/31/2022 0 0 0 0 0 
2/28/2022 0 0 0 0 0 
3/31/2022 0 0 0 0 0 
4/30/2022 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 4,4'-DDT 4,4'-DDT Aldrin Aldrin 
Chlordane (tech mix.
and metabolites) 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max Monthly Ave 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 0 0 0 0 
Maximum 0 0 0 0 0 
Median 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A 
5/31/2022 0 0 0 0 0 
6/30/2022 0 0 0 0 0 
7/31/2022 0 0 0 0 0 
8/31/2022 0 0 0 0 0 
9/30/2022 0 0 0 0 0 
10/31/2022 0 0 0 0 0 
11/30/2022 0 0 0 0 0 
12/31/2022 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Chlordane (tech
mix. and
metabolites) 
Chlordane,
.alpha.-, whole
water 
Chlordane, .alpha.-,
whole water Dieldrin Dieldrin 
Daily Max Monthly Ave Daily Max 
Monthly
Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 0 0 0 0 
Maximum 0 0 0 0 0 
Median 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A 
1/31/2018 0 0 0 0 0 
2/28/2018 0 0 0 0 0 
3/31/2018 0 0 0 0 0 
4/30/2018 0 0 0 0 0 
5/31/2018 0 0 0 0 0 
6/30/2018 0 0 0 0 0 
7/31/2018 0 0 0 0 0 
8/31/2018 0 0 0 0 0 
9/30/2018 0 0 0 0 0 
10/31/2018 0 0 0 0 0 
11/30/2018 0 0 0 0 0 
12/31/2018 0 0 0 0 0 
1/31/2019 0 0 0 0 0 
2/28/2019 0 0 0 0 0 
3/31/2019 0 0 0 0 0 
4/30/2019 0 0 0 0 0 
5/31/2019 0 0 0 0 0 
6/30/2019 0 0 0 0 0 
7/31/2019 0 0 0 0 0 
8/31/2019 0 0 0 0 0 
9/30/2019 0 0 0 0 0 
10/31/2019 0 0 0 0 0 
11/30/2019 0 0 0 0 0 
12/31/2019 0 0 0 0 0 
1/31/2020 0 0 0 0 0 
2/29/2020 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Chlordane (tech
mix. and
metabolites) 
Chlordane,
.alpha.-, whole
water 
Chlordane, .alpha.-,
whole water Dieldrin Dieldrin 
Daily Max Monthly Ave Daily Max 
Monthly
Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 0 0 0 0 
Maximum 0 0 0 0 0 
Median 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A 
3/31/2020 0 0 0 0 0 
4/30/2020 0 0 0 0 0 
5/31/2020 0 0 0 0 0 
6/30/2020 0 0 0 0 0 
7/31/2020 0 0 0 0 0 
8/31/2020 0 0 0 0 0 
9/30/2020 0 0 0 0 0 
10/31/2020 0 0 0 0 0 
11/30/2020 0 0 0 0 0 
12/31/2020 0 0 0 0 0 
1/31/2021 0 0 0 0 0 
2/28/2021 0 0 0 0 0 
3/31/2021 0 0 0 0 0 
4/30/2021 0 0 0 0 0 
5/31/2021 0 0 0 0 0 
6/30/2021 0 0 0 0 0 
7/31/2021 0 0 0 0 0 
8/31/2021 0 0 0 0 0 
9/30/2021 0 0 0 0 0 
10/31/2021 0 0 0 0 0 
11/30/2021 0 0 0 0 0 
12/31/2021 0 0 0 0 0 
1/31/2022 0 0 0 0 0 
2/28/2022 0 0 0 0 0 
3/31/2022 0 0 0 0 0 
4/30/2022 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Chlordane (tech
mix. and
metabolites) 
Chlordane,
.alpha.-, whole
water 
Chlordane, .alpha.-,
whole water Dieldrin Dieldrin 
Daily Max Monthly Ave Daily Max 
Monthly
Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report 
Minimum 0 0 0 0 0 
Maximum 0 0 0 0 0 
Median 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A 
5/31/2022 0 0 0 0 0 
6/30/2022 0 0 0 0 0 
7/31/2022 0 0 0 0 0 
8/31/2022 0 0 0 0 0 
9/30/2022 0 0 0 0 0 
10/31/2022 0 0 0 0 0 
11/30/2022 0 0 0 0 0 
12/31/2022 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter Heptachlor Heptachlor 
Heptachlor
epoxide 
Heptachlor
epoxide 
Hexachloro
benzene 
Hexachloro
benzene PCB-1016 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report Report 0.000045 
Minimum 0 0 0 0 0 0 0 
Maximum 0 0 0 0 0 0 0 
Median 0 0 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A N/A 0 
1/31/2018 0 0 0 0 0 0 0 
2/28/2018 0 0 0 0 0 0 0 
3/31/2018 0 0 0 0 0 0 0 
4/30/2018 0 0 0 0 0 0 0 
5/31/2018 0 0 0 0 0 0 0 
6/30/2018 0 0 0 0 0 0 0 
7/31/2018 0 0 0 0 0 0 0 
8/31/2018 0 0 0 0 0 0 0 
9/30/2018 0 0 0 0 0 0 0 
10/31/2018 0 0 0 0 0 0 0 
11/30/2018 0 0 0 0 0 0 0 
12/31/2018 0 0 0 0 0 0 0 
1/31/2019 0 0 0 0 0 0 0 
2/28/2019 0 0 0 0 0 0 0 
3/31/2019 0 0 0 0 0 0 0 
4/30/2019 0 0 0 0 0 0 0 
5/31/2019 0 0 0 0 0 0 0 
6/30/2019 0 0 0 0 0 0 0 
7/31/2019 0 0 0 0 0 0 0 
8/31/2019 0 0 0 0 0 0 0 
9/30/2019 0 0 0 0 0 0 0 
10/31/2019 0 0 0 0 0 0 0 
11/30/2019 0 0 0 0 0 0 0 
12/31/2019 0 0 0 0 0 0 0 
1/31/2020 0 0 0 0 0 0 0 
2/29/2020 0 0 0 0 0 0 0 
25 of 42

Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter Heptachlor Heptachlor 
Heptachlor
epoxide 
Heptachlor
epoxide 
Hexachloro
benzene 
Hexachloro
benzene PCB-1016 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report Report 0.000045 
Minimum 0 0 0 0 0 0 0 
Maximum 0 0 0 0 0 0 0 
Median 0 0 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A N/A 0 
3/31/2020 0 0 0 0 0 0 0 
4/30/2020 0 0 0 0 0 0 0 
5/31/2020 0 0 0 0 0 0 0 
6/30/2020 0 0 0 0 0 0 0 
7/31/2020 0 0 0 0 0 0 0 
8/31/2020 0 0 0 0 0 0 0 
9/30/2020 0 0 0 0 0 0 0 
10/31/2020 0 0 0 0 0 0 0 
11/30/2020 0 0 0 0 0 0 0 
12/31/2020 0 0 0 0 0 0 0 
1/31/2021 0 0 0 0 0 0 0 
2/28/2021 0 0 0 0 0 0 0 
3/31/2021 0 0 0 0 0 0 0 
4/30/2021 0 0 0 0 0 0 0 
5/31/2021 0 0 0 0 0 0 0 
6/30/2021 0 0 0 0 0 0 0 
7/31/2021 0 0 0 0 0 0 0 
8/31/2021 0 0 0 0 0 0 0 
9/30/2021 0 0 0 0 0 0 0 
10/31/2021 0 0 0 0 0 0 0 
11/30/2021 0 0 0 0 0 0 0 
12/31/2021 0 0 0 0 0 0 0 
1/31/2022 0 0 0 0 0 0 0 
2/28/2022 0 0 0 0 0 0 0 
3/31/2022 0 0 0 0 0 0 0 
4/30/2022 0 0 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter Heptachlor Heptachlor 
Heptachlor
epoxide 
Heptachlor
epoxide 
Hexachloro
benzene 
Hexachloro
benzene PCB-1016 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report Report Report Report Report Report 0.000045 
Minimum 0 0 0 0 0 0 0 
Maximum 0 0 0 0 0 0 0 
Median 0 0 0 0 0 0 0 
No. of Violations N/A N/A N/A N/A N/A N/A 0 
5/31/2022 0 0 0 0 0 0 0 
6/30/2022 0 0 0 0 0 0 0 
7/31/2022 0 0 0 0 0 0 0 
8/31/2022 0 0 0 0 0 0 0 
9/30/2022 0 0 0 0 0 0 0 
10/31/2022 0 0 0 0 0 0 0 
11/30/2022 0 0 0 0 0 0 0 
12/31/2022 0 0 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter PCB-1016 PCB-1221 PCB-1221 PCB-1232 PCB-1232 PCB-1242 PCB-1242 
Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report 0.000045 Report 0.000045 Report 0.000045 Report 
Minimum 0 0 0 0 0 0 0 
Maximum 0 0 0 0 0 0 0 
Median 0 0 0 0 0 0 0 
No. of Violations N/A 0 N/A 0 N/A 0 N/A 
1/31/2018 0 0 0 0 0 0 0 
2/28/2018 0 0 0 0 0 0 0 
3/31/2018 0 0 0 0 0 0 0 
4/30/2018 0 0 0 0 0 0 0 
5/31/2018 0 0 0 0 0 0 0 
6/30/2018 0 0 0 0 0 0 0 
7/31/2018 0 0 0 0 0 0 0 
8/31/2018 0 0 0 0 0 0 0 
9/30/2018 0 0 0 0 0 0 0 
10/31/2018 0 0 0 0 0 0 0 
11/30/2018 0 0 0 0 0 0 0 
12/31/2018 0 0 0 0 0 0 0 
1/31/2019 0 0 0 0 0 0 0 
2/28/2019 0 0 0 0 0 0 0 
3/31/2019 0 0 0 0 0 0 0 
4/30/2019 0 0 0 0 0 0 0 
5/31/2019 0 0 0 0 0 0 0 
6/30/2019 0 0 0 0 0 0 0 
7/31/2019 0 0 0 0 0 0 0 
8/31/2019 0 0 0 0 0 0 0 
9/30/2019 0 0 0 0 0 0 0 
10/31/2019 0 0 0 0 0 0 0 
11/30/2019 0 0 0 0 0 0 0 
12/31/2019 0 0 0 0 0 0 0 
1/31/2020 0 0 0 0 0 0 0 
2/29/2020 0 0 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter PCB-1016 PCB-1221 PCB-1221 PCB-1232 PCB-1232 PCB-1242 PCB-1242 
Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report 0.000045 Report 0.000045 Report 0.000045 Report 
Minimum 0 0 0 0 0 0 0 
Maximum 0 0 0 0 0 0 0 
Median 0 0 0 0 0 0 0 
No. of Violations N/A 0 N/A 0 N/A 0 N/A 
3/31/2020 0 0 0 0 0 0 0 
4/30/2020 0 0 0 0 0 0 0 
5/31/2020 0 0 0 0 0 0 0 
6/30/2020 0 0 0 0 0 0 0 
7/31/2020 0 0 0 0 0 0 0 
8/31/2020 0 0 0 0 0 0 0 
9/30/2020 0 0 0 0 0 0 0 
10/31/2020 0 0 0 0 0 0 0 
11/30/2020 0 0 0 0 0 0 0 
12/31/2020 0 0 0 0 0 0 0 
1/31/2021 0 0 0 0 0 0 0 
2/28/2021 0 0 0 0 0 0 0 
3/31/2021 0 0 0 0 0 0 0 
4/30/2021 0 0 0 0 0 0 0 
5/31/2021 0 0 0 0 0 0 0 
6/30/2021 0 0 0 0 0 0 0 
7/31/2021 0 0 0 0 0 0 0 
8/31/2021 0 0 0 0 0 0 0 
9/30/2021 0 0 0 0 0 0 0 
10/31/2021 0 0 0 0 0 0 0 
11/30/2021 0 0 0 0 0 0 0 
12/31/2021 0 0 0 0 0 0 0 
1/31/2022 0 0 0 0 0 0 0 
2/28/2022 0 0 0 0 0 0 0 
3/31/2022 0 0 0 0 0 0 0 
4/30/2022 0 0 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter PCB-1016 PCB-1221 PCB-1221 PCB-1232 PCB-1232 PCB-1242 PCB-1242 
Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit Report 0.000045 Report 0.000045 Report 0.000045 Report 
Minimum 0 0 0 0 0 0 0 
Maximum 0 0 0 0 0 0 0 
Median 0 0 0 0 0 0 0 
No. of Violations N/A 0 N/A 0 N/A 0 N/A 
5/31/2022 0 0 0 0 0 0 0 
6/30/2022 0 0 0 0 0 0 0 
7/31/2022 0 0 0 0 0 0 0 
8/31/2022 0 0 0 0 0 0 0 
9/30/2022 0 0 0 0 0 0 0 
10/31/2022 0 0 0 0 0 0 0 
11/30/2022 0 0 0 0 0 0 0 
12/31/2022 0 0 0 0 0 0 0 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter PCB-1248 PCB-1248 PCB-1254 PCB-1254 PCB-1260 PCB-1260 
Polychlorin
ated
biphenyls
(PCBs) 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit 0.000045 Report 0.000045 Report 0.000045 Report Report 
Minimum 0 0 0 0 0 0 0.00026 
Maximum 0 0 0 0 0 0 0.0058 
Median 0 0 0 0 0 0 0.000985 
No. of Violations 0 N/A 0 N/A 0 N/A N/A 
1/31/2018 0 0 0 0 0 0 0.0003 
2/28/2018 0 0 0 0 0 0 0.00041 
3/31/2018 0 0 0 0 0 0 0.00029 
4/30/2018 0 0 0 0 0 0 0.00074 
5/31/2018 0 0 0 0 0 0 0.00097 
6/30/2018 0 0 0 0 0 0 0.00122 
7/31/2018 0 0 0 0 0 0 0.00084 
8/31/2018 0 0 0 0 0 0 0.00052 
9/30/2018 0 0 0 0 0 0 0.00074 
10/31/2018 0 0 0 0 0 0 0.00076 
11/30/2018 0 0 0 0 0 0 0.00045 
12/31/2018 0 0 0 0 0 0 0.00026 
1/31/2019 0 0 0 0 0 0 0.00035 
2/28/2019 0 0 0 0 0 0 0.00068 
3/31/2019 0 0 0 0 0 0 0.00038 
4/30/2019 0 0 0 0 0 0 0.0003 
5/31/2019 0 0 0 0 0 0 0.00032 
6/30/2019 0 0 0 0 0 0 0.00103 
7/31/2019 0 0 0 0 0 0 0.00107 
8/31/2019 0 0 0 0 0 0 0.00147 
9/30/2019 0 0 0 0 0 0 0.00101 
10/31/2019 0 0 0 0 0 0 0.00078 
11/30/2019 0 0 0 0 0 0 0.00087 
12/31/2019 0 0 0 0 0 0 0.00082 
1/31/2020 0 0 0 0 0 0 0.00086 
2/29/2020 0 0 0 0 0 0 0.00099 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter PCB-1248 PCB-1248 PCB-1254 PCB-1254 PCB-1260 PCB-1260 
Polychlorin
ated
biphenyls
(PCBs) 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit 0.000045 Report 0.000045 Report 0.000045 Report Report 
Minimum 0 0 0 0 0 0 0.00026 
Maximum 0 0 0 0 0 0 0.0058 
Median 0 0 0 0 0 0 0.000985 
No. of Violations 0 N/A 0 N/A 0 N/A N/A 
3/31/2020 0 0 0 0 0 0 0.00449 
4/30/2020 0 0 0 0 0 0 0.00337 
5/31/2020 0 0 0 0 0 0 0.0016 
6/30/2020 0 0 0 0 0 0 0.00097 
7/31/2020 0 0 0 0 0 0 0.00081 
8/31/2020 0 0 0 0 0 0 0.00079 
9/30/2020 0 0 0 0 0 0 0.00093 
10/31/2020 0 0 0 0 0 0 0.00079 
11/30/2020 0 0 0 0 0 0 0.00082 
12/31/2020 0 0 0 0 0 0 0.0011 
1/31/2021 0 0 0 0 0 0 0.00047 
2/28/2021 0 0 0 0 0 0 0.00146 
3/31/2021 0 0 0 0 0 0 0.00141 
4/30/2021 0 0 0 0 0 0 0.00111 
5/31/2021 0 0 0 0 0 0 0.00057 
6/30/2021 0 0 0 0 0 0 0.00101 
7/31/2021 0 0 0 0 0 0 0.00132 
8/31/2021 0 0 0 0 0 0 0.00116 
9/30/2021 0 0 0 0 0 0 0.00145 
10/31/2021 0 0 0 0 0 0 0.00125 
11/30/2021 0 0 0 0 0 0 0.00118 
12/31/2021 0 0 0 0 0 0 0.00199 
1/31/2022 0 0 0 0 0 0 0.00194 
2/28/2022 0 0 0 0 0 0 0.00352 
3/31/2022 0 0 0 0 0 0 0.00571 
4/30/2022 0 0 0 0 0 0 0.00441 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter PCB-1248 PCB-1248 PCB-1254 PCB-1254 PCB-1260 PCB-1260 
Polychlorin
ated
biphenyls
(PCBs) 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave Daily Max 
Monthly
Ave 
Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L 
Effluent Limit 0.000045 Report 0.000045 Report 0.000045 Report Report 
Minimum 0 0 0 0 0 0 0.00026 
Maximum 0 0 0 0 0 0 0.0058 
Median 0 0 0 0 0 0 0.000985 
No. of Violations 0 N/A 0 N/A 0 N/A N/A 
5/31/2022 0 0 0 0 0 0 0.00107 
6/30/2022 0 0 0 0 0 0 0.00098 
7/31/2022 0 0 0 0 0 0 0.00148 
8/31/2022 0 0 0 0 0 0 0.0015 
9/30/2022 0 0 0 0 0 0 0.00129 
10/31/2022 0 0 0 0 0 0 0.00084 
11/30/2022 0 0 0 0 0 0 0.0058 
12/31/2022 0 0 0 0 0 0 0.00159 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Polychlorin
ated
biphenyls
(PCBs) 
Volatile
fraction
organics
(EPA 624) 
Volatile
fraction
organics
(EPA 624) 
LC50
Acute
Menidia 
LC50 Static 48Hr
Acute Mysid.
Bahia 
Noael Statre
7Day Chronic
Menidia 
Daily Max 
Monthly
Ave Daily Max Daily Min Daily Min Daily Min 
Units ug/L ug/L ug/L % % % 
Effluent Limit Report Report Report 50 50 1.5 
Minimum 0.00032 0 0 77.7 72.9 6.25 
Maximum 0.00854 41.8 51.6 100 100 100 
Median 0.001205 0 0 100 100 100 
No. of Violations N/A N/A N/A 0 0 0 
1/31/2018 0.00039 0 0 100 100 100 
2/28/2018 0.00071 0 0 100 100 100 
3/31/2018 0.00059 0 0 100 100 100 
4/30/2018 0.00089 0 0 100 100 100 
5/31/2018 0.00106 6.6 13.2 100 100 100 
6/30/2018 0.00164 0 0 100 100 50 
7/31/2018 0.00292 0 0 100 100 50 
8/31/2018 0.00084 0 0 100 100 100 
9/30/2018 0.0008 0 0 100 100 50 
10/31/2018 0.00089 0 0 100 100 100 
11/30/2018 0.00058 0 0 100 100 100 
12/31/2018 0.00032 0 0 100 100 100 
1/31/2019 0.00045 5.25 10.5 100 100 100 
2/28/2019 0.0009 41.8 51.6 100 100 50 
3/31/2019 0.00043 0 0 100 100 50 
4/30/2019 0.00039 0 0 100 100 100 
5/31/2019 0.00044 0 0 100 100 100 
6/30/2019 0.00183 6.7 13.4 100 100 25 
7/31/2019 0.00115 0 0 100 100 100 
8/31/2019 0.00268 0 0 100 85.4 100 
9/30/2019 0.00115 0 0 100 92.6 100 
10/31/2019 0.0009 0 0 100 100 100 
11/30/2019 0.00101 0 0 100 100 100 
12/31/2019 0.00114 0 0 100 100 100 
1/31/2020 0.00115 0 0 100 100 100 
2/29/2020 0.00118 0 0 100 100 100 
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Fact Sheet Permit No. MA0103284
2023 Reissuance
Appendix C: DITP DMR Data 
Parameter 
Polychlorin
ated
biphenyls
(PCBs) 
Volatile
fraction
organics
(EPA 624) 
Volatile
fraction
organics
(EPA 624) 
LC50
Acute
Menidia 
LC50 Static 48Hr
Acute Mysid.
Bahia 
Noael Statre
7Day Chronic
Menidia 
Daily Max 
Monthly
Ave Daily Max Daily Min Daily Min Daily Min 
Units ug/L ug/L ug/L % % % 
Effluent Limit Report Report Report 50 50 1.5 
Minimum 0.00032 0 0 77.7 72.9 6.25 
Maximum 0.00854 41.8 51.6 100 100 100 
Median 0.001205 0 0 100 100 100 
No. of Violations N/A N/A N/A 0 0 0 
3/31/2020 0.00514 0 0 100 100 100 
4/30/2020 0.00365 0 0 100 100 100 
5/31/2020 0.00325 0 0 100 100 100 
6/30/2020 0.00129 0 0 100 100 50 
7/31/2020 0.00089 0 0 100 100 50 
8/31/2020 0.00116 0 0 100 100 50 
9/30/2020 0.00104 0 0 100 100 50 
10/31/2020 0.00097 0 0 100 73.3 50 
11/30/2020 0.00094 0 0 100 100 6.25 
12/31/2020 0.00193 5.4 10.8 100 100 100 
1/31/2021 0.00053 0 0 100 100 100 
2/28/2021 0.00308 17.47 29.6 100 100 100 
3/31/2021 0.00154 0 0 100 100 100 
4/30/2021 0.00142 0 0 100 100 100 
5/31/2021 0.00075 3.89 7.77 100 100 100 
6/30/2021 0.00123 0 0 100 100 100 
7/31/2021 0.00153 13.5 27 100 100 100 
8/31/2021 0.00152 0 0 100 100 100 
9/30/2021 0.0017 0 0 100 100 100 
10/31/2021 0.00315 0 0 100 100 100 
11/30/2021 0.00156 0 0 100 100 50 
12/31/2021 0.00243 0 0 100 100 50 
1/31/2022 0.00224 0 0 100 100 100 
2/28/2022 0.00404 0 0 100 100 50 
3/31/2022 0.00601 0 0 100 100 50 
4/30/2022 0.00469 0 0 100 100 50 
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Appendix C: DITP DMR Data 
Parameter 
Polychlorin
ated
biphenyls
(PCBs) 
Volatile
fraction
organics
(EPA 624) 
Volatile
fraction
organics
(EPA 624) 
LC50
Acute
Menidia 
LC50 Static 48Hr
Acute Mysid.
Bahia 
Noael Statre
7Day Chronic
Menidia 
Daily Max 
Monthly
Ave Daily Max Daily Min Daily Min Daily Min 
Units ug/L ug/L ug/L % % % 
Effluent Limit Report Report Report 50 50 1.5 
Minimum 0.00032 0 0 77.7 72.9 6.25 
Maximum 0.00854 41.8 51.6 100 100 100 
Median 0.001205 0 0 100 100 100 
No. of Violations N/A N/A N/A 0 0 0 
5/31/2022 0.00233 0 0 100 100 100 
6/30/2022 0.00172 0 0 100 100 50 
7/31/2022 0.00173 5.05 10.1 100 100 50 
8/31/2022 0.00181 0 0 100 100 25 
9/30/2022 0.00162 0 0 100 100 50 
10/31/2022 0.00094 0 0 77.7 72.9 25 
11/30/2022 0.00854 0 0 92.6 91.4 25 
12/31/2022 0.00202 5.25 10.5 
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Appendix C: DITP DMR Data 
Parameter 
Noel Static 1Hr
Fert. Chronic
Arbacia TSS TSS TSS 
CBOD5/N
H3-N 
CBOD5/N
H3-N 
CBOD5/N
H3-N 
Daily Min 
Monthly
Ave 
Weekly
Ave Daily Max 
Monthly
Ave 
Weekly
Ave Daily Max 
Units % mg/L mg/L mg/L mg/L mg/L mg/L 
Effluent Limit 1.5 Report Report Report Report Report Report 
Minimum 25 120.1 143.7 185.1 72.4 83.1 105.9 
Maximum 100 331.6 368.2 624.7 169.1 205 252.3 
Median 100 191.65 227 328.45 112.25 137.9 170.8 
No. of Violations 0 N/A N/A N/A N/A N/A N/A 
1/31/2018 100 209.3 281.4 352.9 111.6 135.4 165.5 
2/28/2018 100 182.1 227 277.8 100.9 110.2 143.4 
3/31/2018 100 142.9 194 307.8 73.2 91.9 124.3 
4/30/2018 100 197.5 223.2 286.7 95.9 108.5 132.8 
5/31/2018 100 227.4 232.4 387.2 124.8 131.2 165.5 
6/30/2018 100 267.2 291.4 360.3 147 163.9 194.2 
7/31/2018 100 226.4 260.7 328.7 146.1 176.7 229.9 
8/31/2018 100 270.6 273.3 433.3 154.8 162.6 234.3 
9/30/2018 100 331.6 368.2 624.7 157.9 188.2 230.8 
10/31/2018 100 268.8 302.8 453 125.8 141.5 174.5 
11/30/2018 100 199 355.9 497.8 95.8 162 216.9 
12/31/2018 100 202.9 221.2 308.1 127.1 137.6 216.9 
1/31/2019 100 143.7 181.9 207.7 102.4 145.1 168 
2/28/2019 100 144.6 165.7 227.7 101.2 119.1 134.2 
3/31/2019 100 132.9 159.6 204.3 99.2 105.2 141.4 
4/30/2019 100 155.8 207.1 471.7 99.2 131.6 199.6 
5/31/2019 100 175.6 184.5 254.5 109.7 122.2 159.5 
6/30/2019 100 191.6 205.2 283.3 133.4 138.5 171 
7/31/2019 100 183.3 193.9 264.2 101.8 110.4 145.7 
8/31/2019 100 212.4 252.3 390.4 129.7 144.3 190 
9/30/2019 100 253.5 259.5 352.1 168.8 181 203 
10/31/2019 100 212.8 268.9 392.6 136.2 173.2 188.6 
11/30/2019 100 247.6 279 366.3 143.6 160.1 181.9 
12/31/2019 100 179.3 231.1 344.3 109 148.7 196.6 
1/31/2020 100 190.3 211.3 239.8 125.7 140.6 170.6 
2/29/2020 100 270.4 357.2 599 139.8 151.2 187.5 
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Appendix C: DITP DMR Data 
Parameter 
Noel Static 1Hr
Fert. Chronic
Arbacia TSS TSS TSS 
CBOD5/N
H3-N 
CBOD5/N
H3-N 
CBOD5/N
H3-N 
Daily Min 
Monthly
Ave 
Weekly
Ave Daily Max 
Monthly
Ave 
Weekly
Ave Daily Max 
Units % mg/L mg/L mg/L mg/L mg/L mg/L 
Effluent Limit 1.5 Report Report Report Report Report Report 
Minimum 25 120.1 143.7 185.1 72.4 83.1 105.9 
Maximum 100 331.6 368.2 624.7 169.1 205 252.3 
Median 100 191.65 227 328.45 112.25 137.9 170.8 
No. of Violations 0 N/A N/A N/A N/A N/A N/A 
3/31/2020 100 201 245.6 331.6 123.1 141.5 171.9 
4/30/2020 100 136.2 147.5 185.1 84.8 99 134.7 
5/31/2020 100 158.4 178.8 220.2 103.9 129 161.7 
6/30/2020 100 210.9 236 352.8 129.4 150.9 196.1 
7/31/2020 100 207.8 227 450.6 128.8 138.2 184.4 
8/31/2020 100 214.1 226 292.2 145.9 168.7 229 
9/30/2020 100 180.6 194.8 290.5 160.3 174.4 202.8 
10/31/2020 100 211.3 276.9 437.5 154.9 205 252.3 
11/30/2020 100 191.7 236.2 357.6 126.9 146.1 220.4 
12/31/2020 100 120.1 143.7 208 72.4 83.1 105.9 
1/31/2021 100 164.9 196 328.2 101.6 113.2 159.7 
2/28/2021 50 160.6 174.9 216.9 110.7 119.7 142.1 
3/31/2021 100 178.4 193.2 309 103.6 116.5 142.3 
4/30/2021 100 176 204.9 252.9 103.9 116.8 133.7 
5/31/2021 100 190.2 319.4 493.3 103 117.7 140.6 
6/30/2021 100 202.8 235.2 415.5 112 116.1 145.3 
7/31/2021 100 133.1 209.9 232.3 73.8 100.4 127.9 
8/31/2021 100 175.6 192.7 290 94.1 101 117.4 
9/30/2021 100 143.6 169.6 239.7 82.3 96.7 123.9 
10/31/2021 50 175.1 210.8 261.7 98.2 116.3 129.8 
11/30/2021 100 151.6 162.1 246.8 94.1 95.5 132.8 
12/31/2021 100 251.5 319.5 380.8 143.3 171.5 223 
1/31/2022 100 187.7 214.3 321.6 112.5 121.2 141.3 
2/28/2022 100 150.5 180.4 250.6 86.4 109.5 139.5 
3/31/2022 100 182.5 189.9 365.9 96.9 99.3 118.3 
4/30/2022 100 182.9 194.7 239.1 101.4 118.3 148.8 
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Appendix C: DITP DMR Data 
Parameter 
Noel Static 1Hr
Fert. Chronic
Arbacia TSS TSS TSS 
CBOD5/N
H3-N 
CBOD5/N
H3-N 
CBOD5/N
H3-N 
Daily Min 
Monthly
Ave 
Weekly
Ave Daily Max 
Monthly
Ave 
Weekly
Ave Daily Max 
Units % mg/L mg/L mg/L mg/L mg/L mg/L 
Effluent Limit 1.5 Report Report Report Report Report Report 
Minimum 25 120.1 143.7 185.1 72.4 83.1 105.9 
Maximum 100 331.6 368.2 624.7 169.1 205 252.3 
Median 100 191.65 227 328.45 112.25 137.9 170.8 
No. of Violations 0 N/A N/A N/A N/A N/A N/A 
5/31/2022 100 217.7 247.5 384 115.5 119.6 177.1 
6/30/2022 100 210.5 265.3 378.6 134.9 139.1 188 
7/31/2022 100 208.4 227.6 298.9 137.6 158.3 183.9 
8/31/2022 100 229.6 239.7 371.6 144.5 166.3 192.7 
9/30/2022 50 235 260.9 386.7 142.5 159.2 180.7 
10/31/2022 25 227.6 292.5 396.7 141 190.4 228.6 
11/30/2022 100 210.1 227.9 290.4 169.1 178.9 196.8 
12/31/2022 177.4 260.5 338.5 110.2 162.3 164.7 
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Appendix C: DITP DMR Data 
Parameter 
Chloride
(as Cl) 
Fecal
Coliform 
Fecal
Coliform 
Fecal
Coliform 
Daily Max 
Monthly
Geometric
Mean Daily Max MEDIAN 
Units mg/L #/100mL #/100mL #/100mL 
Effluent Limit Report 200 400 200 
Minimum 475 No Data No Data No Data 
Maximum 2028 No Data No Data No Data 
Median 853.5 No Data No Data No Data 
No. of Violations N/A No Data No Data No Data 
1/31/2018 2028 
2/28/2018 1427 
3/31/2018 1287 
4/30/2018 689 
5/31/2018 695 
6/30/2018 966 
7/31/2018 944 
8/31/2018 898 
9/30/2018 904 
10/31/2018 734 
11/30/2018 579 
12/31/2018 515 
1/31/2019 1628 
2/28/2019 1424 
3/31/2019 1316 
4/30/2019 730 
5/31/2019 770 
6/30/2019 728 
7/31/2019 822 
8/31/2019 901 
9/30/2019 932 
10/31/2019 982 
11/30/2019 817 
12/31/2019 1191 
1/31/2020 920 
2/29/2020 932 
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Appendix C: DITP DMR Data 
Parameter 
Chloride
(as Cl) 
Fecal
Coliform 
Fecal
Coliform 
Fecal
Coliform 
Daily Max 
Monthly
Geometric
Mean Daily Max MEDIAN 
Units mg/L #/100mL #/100mL #/100mL 
Effluent Limit Report 200 400 200 
Minimum 475 No Data No Data No Data 
Maximum 2028 No Data No Data No Data 
Median 853.5 No Data No Data No Data 
No. of Violations N/A No Data No Data No Data 
3/31/2020 838 
4/30/2020 760 
5/31/2020 775 
6/30/2020 894 
7/31/2020 944 
8/31/2020 944 
9/30/2020 1237 
10/31/2020 869 
11/30/2020 790 
12/31/2020 1097 
1/31/2021 782 
2/28/2021 1545 
3/31/2021 748 
4/30/2021 1057 
5/31/2021 495 
6/30/2021 593 
7/31/2021 475 
8/31/2021 695 
9/30/2021 565 
10/31/2021 639 
11/30/2021 510 
12/31/2021 557 
1/31/2022 1274 
2/28/2022 1340 
3/31/2022 834 
4/30/2022 541 
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Appendix C: DITP DMR Data 
Parameter 
Chloride
(as Cl) 
Fecal
Coliform 
Fecal
Coliform 
Fecal
Coliform 
Daily Max 
Monthly
Geometric
Mean Daily Max MEDIAN 
Units mg/L #/100mL #/100mL #/100mL 
Effluent Limit Report 200 400 200 
Minimum 475 No Data No Data No Data 
Maximum 2028 No Data No Data No Data 
Median 853.5 No Data No Data No Data 
No. of Violations N/A No Data No Data No Data 
5/31/2022 725 
6/30/2022 822 
7/31/2022 1022 
8/31/2022 903 
9/30/2022 1053 
10/31/2022 869 
11/30/2022 785 
12/31/2022 706 
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Appendix D: Permitting Approach for POTWs with Co-permittees 
1 
EPA REGION 1 NPDES PERMITTING APPROACH FOR PUBLICLY OWNED
TREATMENT WORKS THAT INCLUDE MUNICIPAL SATELLITE SEWAGE
COLLECTION SYSTEMS 
This regional interpretative statement provides notice to the public of EPA Region 1’s
interpretation of the Clean Water Act (“CWA” or “Act”) and implementing regulations, and
advises the public of relevant policy considerations, regarding the applicability of the National
Pollutant Discharge Elimination System (“NPDES”) program to publicly owned treatment works
(“POTWs”) that include municipal satellite sewage collection systems (“regionally integrated
POTWs”). When issuing NPDES permits to these types of sanitary sewer systems, it is EPA
Region 1’s practice to include and regulate the owners/operators of the municipal satellite
collection systems through a co-permitting structure. This interpretative statement is intended to
explain, generally, the basis for this practice. EPA Region 1’s decision in any particular case
will be made by applying the law and regulations on the basis of specific facts when permits are
issued. 
EPA has set out a national policy goal for the nation’s sanitary sewer systems to adhere to strict
design and operational standards: 
“Proper [operation and maintenance] of the nation’s sewers is integral to ensuring that
wastewater is collected, transported, and treated at POTWs; and to reducing the volume
and frequency of …[sanitary sewer overflow] discharges. Municipal owners and
operators of sewer systems and wastewater treatment facilities need to manage their
assets effectively and implement new controls, where necessary, as this infrastructure
continues to age. Innovative responses from all levels of government and consumers are
needed to close the gap.” 1 
Because ownership/operation of a regionally integrated POTW is divided among multiple
parties, the owner/operator of the treatment plant many times lacks the means to implement
comprehensive, system-wide operation and maintenance (“O&M”) procedures. Failure to
properly implement O&M measures in a POTW can cause, among other things, excessive
extraneous flow ( i.e. , inflow and infiltration) to enter, strain and occasionally overload treatment
system capacity. This failure not only impedes EPA’s national policy goal concerning
preservation of the nation’s wastewater infrastructure assets, but also frustrates achievement of
the water quality- and technology-based requirements of CWA § 301 to the extent it results in
sanitary sewer overflows and degraded treatment plant performance, with adverse impacts on
human health and the environment. 
In light of these policy objectives and legal requirements, it is EPA Region 1’s permitting
practice to subject all portions of the POTW to NPDES requirements in order to ensure that the
treatment system as a whole is properly operated and maintained and that human health and
water quality impacts resulting from excessive extraneous flow are minimized. The approach of
addressing O&M concerns in a regionally integrated treatment works by adding municipal 
1 See Report to Congress: Impacts and Control of CSOs and SSOs (EPA 833-R-04-001) (2004), at p. 10-2. See also 
“1989 National CSO Control Strategy,” 54 Fed. Reg. 37371 (September 8, 1989).

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Appendix D: Permitting Approach for POTWs with Co-permittees 
2 
satellite collection systems as co-permittees is consistent with the definition of “publicly owned
treatment works,” which by definition includes sewage collection systems. Under this approach,
the POTW in its entirety is subject to NPDES regulation as a point source discharger under the
Act. This entails imposition of permitting requirements applicable to the POTW treatment plant
along with a more limited set of conditions applicable to the connected municipal satellite
collection systems. 
The factual and legal basis for the Region’s position is set forth in greater detail in Attachment A .

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Appendix D: Permitting Approach for POTWs with Co-permittees 
3 
Attachment A 
ANALYSIS SUPPORTING EPA REGION 1 
NPDES PERMITTING APPROACH FOR PUBLICLY OWNED TREATMENT
WORKS THAT INCLUDE MUNICIPAL SATELLITE SEWAGE COLLECTION 
SYSTEMS 
Exhibit A List of regional centralized POTW treatment plants and municipal satellite
collection systems subject to the co-permittee policy 
Exhibit B Analysis of extraneous flow trends for representative systems 
Exhibit C Form of Regional Administrator’s waiver of permit application
requirements for municipal satellite collection systems 
Introduction 
On May 28, 2010, the U.S. EPA Environmental Appeals Board (“Board”) issued a decision
remanding to the Region certain NPDES permit provisions that included and regulated satellite
collection systems as co-permittees. See In re Upper Blackstone Water Pollution Abatement
District , NPDES Appeal Nos. 08-11 to 08-18 & 09-06, 14 E.A.D. ( Order Denying Review in 
Part and Remanding in Part , EAB, May 28, 2010). 2 While the Board “did not pass judgment”
on the Region’s position that its NPDES jurisdiction encompassed the entire POTW and not only
the treatment plant, it held that “where the Region has abandoned its historical practice of
limiting the permit only to the legal entity owning and operating the wastewater treatment plant,
the Region had not sufficiently articulated in the record of this proceeding the statutory,
regulatory, and factual bases for expanding the scope of NPDES authority beyond the treatment
plant owner/operator to separately owned/operated collection systems that do not discharge
directly to waters of the United States, but instead that discharge to the treatment plant.” Id., slip
op . at 2, 18. In the event the Region decided to include and regulate municipal satellite
collection systems as co-permittees in a future permit, the Board posed several questions for the
Region to address in the analysis supporting its decision: 
(1) Is the scope of NPDES authority limited to owners/operators of the treatment plant,
or does the authority extend to owners/operators of the municipal satellite collection
systems that comprise the wider POTW? 
2 The decision is available on the Board’s website via the following link: 
http://yosemite.epa.gov/oa/EAB_Web_Docket.nsf/30b93f139d3788908525706c005185b4/34e841c87f346d9485257 
7360068976f!OpenDocument.

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Appendix D: Permitting Approach for POTWs with Co-permittees 
4 
(2) If the latter, how far up the collection system does NPDES jurisdiction reach, i.e. ,
where does the “collection system” end and the “user” begin? 
(3) Do municipal satellite collection systems “discharge [ ] a pollutant” within the
meaning of the statute and regulations? 
(4) Are municipal satellite collection systems “indirect dischargers” and thus excluded
from NPDES permitting requirements? 
(5) Is the Region’s rationale for regulating municipal satellite collection systems as co-
permittees consistent with the references to “municipality” in the regulatory definition of
POTW, and the definition’s statement that “[t]he term also means the
municipality…which has jurisdiction over the Indirect Discharges to and the discharges
from such a treatment works”? 
(6) Is the Region’s rationale consistent with the permit application and signatory
requirements under NPDES regulations? 
See Blackstone, slip op . at 18, 20, n. 17. 
This regional interpretative statement is, in part, a response to the Board’s decision. It details the
legal and policy bases for regulating as co-permittees publicly owned treatment works
(“POTWs”) that include municipal satellite collection systems. Region 1’s analysis is divided
into five sections. First, the Region provides context for the co-permitting approach by briefly
describing the health and environmental impacts associated with poorly maintained sanitary
sewer systems. Second, the Region outlines its evolving permitting practice regarding regionally
integrated POTWs, particularly its attempts to ensure that such entity’s municipal satellite
collection systems are properly maintained and operated. Third, the Region explains the legal
authority to include municipal satellite collection systems as co-permittees when permitting
regionally integrated POTWs. In this section, the Region answers the questions posed by the
Board in the order presented above. Fourth, the Region sets forth the basis for the specific
conditions to which the municipal satellite collection systems are subject as co-permittees. 
Finally, the Region discusses other considerations informing its decision to employ a co-
permittee structure when permitting regionally integrated POTWs. 
I. Background 
A sanitary sewer system (SSS) is a wastewater collection system owned by a state or
municipality that is designed to collect and convey only sanitary wastewater (domestic sewage
from homes as well as industrial and commercial wastewater). 3 The purpose of these systems is 
3 A combined sewer, on the other hand, is a type of sewer system that collects and conveys sanitary sewage and
stormwater runoff in a single-pipe system to a POTW treatment plant. See generally Report to Congress: Impacts
and Control of CSOs and SSOs (EPA 833-R-04-001) (2004), from which EPA Region 1 has drawn this background
material.

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Appendix D: Permitting Approach for POTWs with Co-permittees 
5 
to transport wastewater uninterrupted from its source to a treatment facility. Developed areas
that are served by sanitary sewers often also have a separate storm sewer system ( e.g. , storm
drains) that collects and conveys runoff, street wash waters and drainage and discharges them
directly to a receiving water ( i.e. , without treatment at a POTW). While sanitary sewers are not
designed to collect large amounts of runoff from precipitation events or provide widespread
drainage, they typically are built with some allowance for higher flows that occur during periods
of high groundwater and storm events. They are thus able to handle minor and controllable
amounts of extraneous flow ( i.e. , inflow and infiltration, or I/I) that enter the system. Inflow
generally refers to water other than wastewater—typically precipitation like rain or snowmelt—
that enters a sewer system through a direct connection to the sewer. Infiltration generally refers
to other water that enters a sewer system from the ground, for example through defects in the
sewer. 
Municipal sanitary sewer collection systems can consist of a widespread network of pipes and
associated components ( e.g. , pump stations). These systems provide wastewater collection
service to the community in which they are located. In some situations, the municipality that
owns the collector sewers may not provide treatment of wastewater, but only conveys its
wastewater to a collection system that is owned and operated by a different municipal entity
(such as a regional sewer district). This is known as a satellite community. A “satellite”
community is a sewage collection system owner/operator that does not have ownership of the
treatment facility and a specific or identified point of discharge but rather the responsibility to
collect and convey the community’s wastewater to a POTW treatment plant for treatment. See 
75 Fed. Reg. 30395, 30400 (June 1, 2010). 
Municipal sanitary sewer collection systems play a critical role in protecting human health and
the environment. Proper operation and maintenance of sanitary sewer collection systems is
integral to ensuring that wastewater is collected, transported, and treated at POTW treatment
plants. Through effective operation and maintenance, collection system operators can maintain
the capacity of the collection system; reduce the occurrence of temporary problem situations
such as blockages; protect the structural integrity and capacity of the system; anticipate potential
problems and take preventive measures; and indirectly improve treatment plant performance by
minimizing deterioration due to I/I-related hydraulic overloading. 
Despite their critical role in the nation’s infrastructure, many collection systems exhibit poor
performance and are subjected to flows that exceed system capacity. Untreated or partially
treated overflows from a sanitary sewer system are termed “sanitary sewer overflows” (SSOs).
SSOs include releases from sanitary sewers that reach waters of the United States as well as
those that back up into buildings and flow out of manholes into city streets. 
There are many underlying reasons for the poor performance of collection systems. Much of the
nation’s sanitary sewer infrastructure is old, and aging infrastructure has deteriorated with time.
Communities also sometimes fail to provide capacity to accommodate increased sewage delivery
and treatment demand from increasing populations. Furthermore, institutional arrangements
relating to the operation of sewers can pose barriers to coordinated action, because many

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Appendix D: Permitting Approach for POTWs with Co-permittees 
6 
municipal sanitary sewer collection systems are not entirely owned or operated by a single
municipal entity. 
The performance and efficiency of municipal collection systems influence the performance of
sewage treatment plants. When the structural integrity of a sanitary sewer collection system
deteriorates, large quantities of infiltration (including rainfall-induced infiltration) and inflow can
enter the collection system, causing it to overflow. These extraneous flows are among the most
serious and widespread operational challenges confronting treatment works. 4 
Infiltration can be long-term seepage of water into a sewer system from the water table. In some
systems, however, the flow characteristics of infiltration can resemble those of inflow, i.e. , there
is a rapid increase in flow during and immediately after a rainfall event, due, for example, to
rapidly rising groundwater. This phenomenon is sometimes referred to as rainfall-induced
infiltration. 
Sanitary sewer systems can also overflow during periods of normal dry weather flows. Many
sewer system failures are attributable to natural aging processes or poor operation and
maintenance. Examples include years of wear and tear on system equipment such as pumps, lift
stations, check valves, and other moveable parts that can lead to mechanical or electrical failure;
freeze/thaw cycles, groundwater flow, and subsurface seismic activity that can result in pipe
movement, warping, brittleness, misalignment, and breakage; and deterioration of pipes and
joints due to root intrusion or other blockages. 
Inflow and infiltration impacts are often regional in nature. Satellite collection systems in the
communities farthest from the POTW treatment plant can cause sanitary sewer overflows
(“SSOs”) in communities between them and the treatment plant by using up capacity in the
interceptors. This can cause SSOs in the interceptors themselves or in the municipal sanitary
sewers that lead to them. The implication of this is that corrective solutions often must also be
regional in scope to be effective. 
The health and environmental risks attributed to SSOs vary depending on a number of factors
including location and season (potential for public exposure), frequency, volume, the amount and
type of pollutants present in the discharge, and the uses, conditions, and characteristics of the
receiving waters. The most immediate health risks associated with SSOs to waters and other
areas with a potential for human contact are associated with exposure to bacteria, viruses, and
other pathogens. 
Human health impacts occur when people become ill due to contact with water or ingestion of
water or shellfish that have been contaminated by SSO discharges. In addition, sanitary sewer
systems can back up into buildings, including private residences. These discharges provide a 
4 In a 1989 Water Pollution Control Federation survey, 1,003 POTWs identified facility performance problems.
Infiltration and inflow was the most frequently cited problem, with 85 percent of the facilities reporting I/I as a
problem. I/I was cited as a major problem by 41 percent of the facilities (32 percent as a periodic problem).

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Appendix D: Permitting Approach for POTWs with Co-permittees 
7 
direct pathway for human contact with untreated wastewater. Exposure to land-based SSOs
typically occurs through the skin via direct contact. The resulting diseases are often similar to
those associated with exposure through drinking water and swimming ( e.g. , gastroenteritis), but
may also include illness caused by inhaling microbial pathogens. In addition to pathogens, raw
sewage may contain metals, synthetic chemicals, nutrients, pesticides, and oils, which also can
be detrimental to the health of humans and wildlife. 
II. EPA Region 1 Past Practice of Permitting POTWs that Include 
Municipal Satellite Collection Systems 
EPA Region 1’s practice in permitting regionally integrated POTWs has developed in tandem
with its increasing focus on addressing I/I in sewer collection systems, in response to the
concerns outlined above. Up to the early 1990s, POTW permits issued by Region 1 generally
did not include specific requirements for collection systems. When I/I and the related issue of
SSOs became a focus of concern both nationally and within the region in the mid-1990s, Region
1 began adding general requirements to POTW permits that required the permittees to “eliminate
excessive infiltration and inflow” and provide an annual “summary report” of activities to reduce
I/I. As the Region gathered more information and gained more experience in assessing these
reports and activities, it began to include more detailed requirements and reporting provisions in
these permits. 
MassDEP also engaged in a parallel effort to address I/I, culminating in 2001 with the issuance
of MassDEP Policy No. BRP01-1, “Interim Infiltration and Inflow Policy.” Among other
provisions, this policy established a set of standard NPDES permit conditions for POTWs that
included development of an I/I control plan (including funding sources, identification and
prioritization of problem areas, and public education programs) and detailed annual reporting
requirements (including mapping, reporting of expenditures and I/I flow calculations). Since
September 2001, these requirements have been the basis for the standard operation and
maintenance conditions related to I/I. 
Regional treatment plants presented special issues as I/I requirements became more specific, as it
is generally the member communities, rather than the regional sewer district, that own the
collection systems that are the primary source of I/I. Before the focus on I/I, POTW permits did
not contain specific requirements related to the collection system component of POTWs. 
Therefore, when issuing NPDES permits to authorize discharges from regionally integrated
treatment POTWs, EPA Region 1 had generally only included the legal entity owning and/or
operating the regionally centralized wastewater treatment plant. As the permit conditions were
focused on the treatment plant itself, this was sufficient to ensure that EPA had authority to
enforce the permit requirements. 
In implementing the I/I conditions, Region 1 initially sought to maintain the same structure,
placing the responsibility on the regional sewer district to require I/I activities by the contributing
systems and to collect the necessary information from those systems for submittal to EPA.
MassDEP’s 2001 Interim I/I Policy reflected this approach, containing a condition for regional
systems:

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((FOR REGIONAL FACILITIES ONLY)) The permittee shall require, through
appropriate agreements, that all member communities develop and implement infiltration
and inflow control plans sufficient to ensure that high flows do not cause or contribute to
a violation of the permittees effluent limitations, or cause overflows from the permittees
collection system. 
As existing NPDES permittees, the POTW treatment plants were an obvious locus of regulation.
The Region assumed the plants would be in a position to leverage preexisting legal and/or
contractual relationships with the satellite collection systems they serve to perform a
coordinating function, and that utilizing this existing structure would be more efficient than
establishing a new system of direct reporting to EPA by the collection system owners. The
Region also believed that the owner/operator of the POTW treatment plant would have an
incentive to reduce flow from contributing satellite systems because doing so would improve
treatment plant performance and reduce operation costs. While relying on this cooperative
approach, however, EPA Region 1 also asserted that it had the authority to require that POTW
collection systems be included as NPDES permittees and that it would do so if it proved
necessary. Indeed, in 2001 Region 1 acceded to Massachusetts Water Resources Authority’s
(“MWRA”) request that the contributing systems to the MWRA Clinton wastewater treatment
plant (“WWTP”) be included as co-permittees, based on evidence provided by MWRA that its
specific relationship with those communities would not permit it to run an effective I/I reduction
program for these collection systems. EPA Region 1 also put satellite collection systems on
notice that they would be directly regulated through legally enforceable permit requirements if
I/I reductions were not pursued or achieved. 
In time, the Region realized that its failure to assert direct jurisdiction over municipal satellite
dischargers was becoming untenable in the face of mounting evidence that cooperative (or in
some cases non-existent) efforts on the part of the POTW treatment plant and associated
satellites were failing to comprehensively address the problem of extraneous flow entering the
POTW. The ability and/or willingness of regional sewer districts to attain meaningful I/I efforts
in their member communities varied widely. The indirect structure of the requirements also
tended to make it difficult for EPA to enforce the implementation of meaningful I/I reduction
programs. 
It became evident to EPA Region 1 that a POTW’s ability to comply with CWA requirements
depended on successful operation and maintenance of not only the treatment plant but also the
collection system. For example, the absence of effective I/I reduction and operation/maintenance
programs was impeding the Region’s ability to prevent or mitigate the human health and water
quality impacts associated with SSOs. Additionally, these excess flows stressed POTW
treatment plants from a hydraulic capacity and performance standpoint, adversely impacting
effluent quality. See Exhibit B (Analysis of extraneous flow trends for representative systems).
Addressing these issues in regional systems was essential, as these include most of the largest
systems in terms of flow, population served and area covered, and serve the largest population
centers.

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The Region’s practice of imposing NPDES permit conditions on the municipal collection
systems in addition to the treatment plant owner/operator represents a necessary and logical
progression in its continuing effort to effectively address the serious problem of I/I in sewer
collection systems. 5 In light of its past permitting experience and the need to effectively address
the problem of extraneous flow on a system-wide basis, Region 1 decided that it was necessary
to refashion permits issued to regionally integrated POTWs to encompass all owners/operators of
the treatment works ( i.e. , the regional centralized POTW treatment plant and the municipal
satellite collection systems. 6 Specifically, Region 1 determined that the satellite systems should
be subject as co-permittees to a limited set of O&M-related conditions on permits issued for
discharges from regionally integrated treatment works. These conditions pertain only to the
portions of the POTW collection system that the satellites own. This ensures maintenance and
pollution control programs are implemented with respect to all portions of the POTW.
Accordingly, since 2005, Region 1 has generally included municipal satellite collection systems
as co-permittees for limited purposes, in addition to the owner/operator of the treatment plant as
the main permittee subject to the full array of NPDES requirements, including secondary
treatment and water-quality based effluent limitations. The Region has identified 36 permits
issued by the Region to POTWs in New Hampshire and Massachusetts that include municipal
satellite collection systems as co-permittees . See Exhibit A . The 36 permits include a total of 81
satellite collection systems as co-permittees. 
III. Legal Authority 
The Region’s prior and now superseded practice of limiting the permit only to the legal entity
owning and/or operating the wastewater treatment plant had never been announced as a regional
policy or interpretation. Similarly, the Region’s practice of imposing NPDES permit conditions
on the municipal collection systems in addition to the treatment plant owner/operator has also
never been expressly announced as a uniform, region-wide policy or interpretation. Upon
consideration of the Board’s decision, described above, EPA Region 1 has decided to supply a
clearer, more detailed explanation regarding its use of a co-permittee structure when issuing
NPDES permits to regionally integrated POTWs. In this section, the Region addresses the
questions posed by the Board in the Upper Blackstone decision referenced above. 
5 Although EPA Region 1 has in the past issued NPDES permits only to the legal entities owning and operating the
wastewater treatment plant ( i.e. , only a portion of the “treatment works”), the Region’s reframing of permits to
include municipal satellite collection systems does not represent a break or reversal from its historical legal position.
EPA Region 1 has never taken the legal position that the satellite collection systems are beyond the reach of the
CWA and the NPDES permitting program. Rather, the Region as a matter of discretion had merely never
determined it necessary to exercise its statutory authority to directly reach these facilities in order to carry out its
NPDES permitting obligations under the Act. 
6 EPA has “considerable flexibility in framing the permit to achieve a desired reduction in pollutant discharges.” 
Natural Resources Defense Council, Inc. v. Costle , 568 F.2d 1369, 1380 (D.C.Cir.1977). (“[T]his ambitious statute
is not hospitable to the concept that the appropriate response to a difficult pollution problem is not to try at all.”).

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(1) Is the scope of NPDES authority limited to owners/operators of the treatment plant, or does
the authority extend to owners/operators of the municipal satellite collection systems that
comprise the wider POTW? 
The scope of NPDES authority extends beyond the owners/operators of the treatment plant to
include to owners/operators of portions of the wider POTW, for the reasons discussed below. 
The CWA prohibits the “discharge of any pollutant by any person” from any point source to
waters of the United States, except, inter alia, in compliance with an NPDES permit issued by
EPA or an authorized state pursuant to Section 402 of the CWA. CWA § 301, 402(a)(1); 40 
C.F.R. § 122.1(b). Where there is a discharge of pollutants, NPDES regulations require the
“operator” of the discharging “facility or activity” to obtain a permit in circumstances where the
operator is different from the owner. Id. § 122.21(b). “Owner or operator” is defined as “the
owner or operator of any ‘facility or activity’ subject to regulation under the NPDES program,”
and a “facility or activity” is “any NPDES ‘point source’ or any other facility or activity
(including land or appurtenances thereto) that is subject to regulation under the NPDES
program.” Id. § 122.2. 
“Publicly owned treatment works” are facilities subject to the NPDES program. Statutorily,
POTWs as a class must meet performance-based requirements based on available wastewater
treatment technology. See CWA § 402(a)(1) (“[t]he Administrator may…issue a permit for the
discharge of any pollutant….upon condition that such discharge will meet (A) all applicable
requirements under [section 301]…”); § 301(b)(1)(B) (“In order to carry out the objective of this
chapter there shall be achieved…for publicly owned treatment works in existence on July 1,
1977...effluent limitations based upon secondary treatment[.]”); see also 40 C.F.R. pt 133. In
addition to secondary treatment requirements, POTWs are also subject to water quality-based
effluent limits if necessary to achieve applicable state water quality standards. See CWA §
301(b)(1)(C). See also 40 C.F.R. § 122.44(a)(1) (“…each NPDES permit shall
include…[t]echnology-based effluent limitations based on: effluent limitations and standards
published under section 301 of the Act”) and (d)(1) (same for water quality standards and state
requirements). NPDES regulations similarly identify the “POTW” as the entity subject to
regulation. See 40 C.F.R. § 122.21(a), (requiring “new and existing POTWs” to submit
information required in 122.21(j),” which in turn requires “all POTWs,” among others, to
provide permit application information). 
A municipal satellite collection system is part of a POTW under applicable law. The CWA and
its implementing regulations broadly define “POTW” to include not only wastewater treatment
plants but also the sewer systems and associated equipment that collect wastewater and convey it
to the plants. Under NPDES regulations at 40 C.F.R. §§ 122.2 and 403.3(q), the term “Publicly
Owned Treatment Works” or “POTW” means “a treatment works as defined by section 212 of
the Act, which is owned by a State or municipality (as defined by section 502(4) of the Act).”
Under section 212 of the Act, 
“(2)(A) The term ‘treatment works’ means any devices and systems used in the storage,
treatment, recycling, and reclamation of municipal sewage or industrial wastes of a liquid

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nature to implement section 1281 of this title, or necessary to recycle or reuse water at the
most economical cost over the estimated life of the works, including intercepting sewers,
outfall sewers, sewage collection systems [emphasis added], pumping, power, and other
equipment, and their appurtenances; extensions, improvements, remodeling, additions,
and alterations thereof; elements essential to provide a reliable recycled supply such as
standby treatment units and clear well facilities; and any works, including site acquisition
of the land that will be an integral part of the treatment process (including land used for
the storage of treated wastewater in land treatment systems prior to land application) or is
used for ultimate disposal of residues resulting from such treatment. 
(B) In addition to the definition contained in subparagraph (A) of this paragraph,
‘treatment works’ means any other method or system for preventing, abating, reducing,
storing, treating, separating, or disposing of municipal waste, including storm water
runoff, or industrial waste, including waste in combined storm water and sanitary sewer
systems [emphasis added]. Any application for construction grants which includes wholly
or in part such methods or systems shall, in accordance with guidelines published by the
Administrator pursuant to subparagraph (C) of this paragraph, contain adequate data and
analysis demonstrating such proposal to be, over the life of such works, the most cost
efficient alternative to comply with sections 1311 or 1312 of this title, or the
requirements of section 1281 of this title.” 
Under the NPDES program regulations, this definition has been interpreted as follows: 
“The term Publicly Owned Treatment Works or POTW [emphasis in original]…includes
any devices and systems used in the storage, treatment, recycling and reclamation of
municipal sewage or industrial wastes of a liquid nature. It also includes sewers, pipes
and other conveyances only if they convey wastewater to a POTW Treatment Plant. The
term also means the municipality as defined in section 502(4) of the Act, which has
jurisdiction over the Indirect Discharges to and the discharges from such a treatment
works.” 
See 40 C.F.R. § 122.2, cross-referencing 403.3(q). 
The statutory and regulatory definitions plainly encompass both the POTW treatment plant and
municipal satellite collection systems. Municipal satellite collection systems are part of a POTW
by definition ( i.e. , they are “sewage collection systems” under section 212(A) and “sanitary
sewer systems” under section 212(B)). They are also conveyances that send wastewater to a
POTW treatment plant for treatment under 40 C.F.R. 403.3(q)). The preamble to the rule that
created the regulatory definition of POTW supports the reading that the treatment plant
comprises only a portion of the POTW. See 44 Fed. Reg. 62260, 62261 (Oct. 29, 1979). 7 
7 “A new provision…defining the term ‘POTW Treatment Plant’ has been added to avoid an ambiguity that now
exists whenever a reference is made to a POTW (publicly owned treatment works). …[T]he existing regulation
defines a POTW to include both the treatment plant and the sewer pipes and other conveyances leading to it. As a
result, it is unclear whether a particular reference is to the pipes, the treatment plant, or both. The term “POTW

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Consistent with EPA Region 1’s interpretation, courts have similarly taken a broad reading of the
terms treatment works and POTW. 8 
(2) If the latter, how far up the collection system does NPDES jurisdiction reach, i.e., where
does the “collection system” end and the “user” begin? 
NPDES jurisdiction extends beyond the treatment plant to the outer boundary of the municipally-
owned sewage collection systems, which are defined as sewers whose purpose is to be a common
carrier of wastewater for others to a POTW treatment plant for treatment, as explained below. 
As discussed in response to Question 1 above, the term “treatment works” is defined to include
“sewage collection systems.” CWA § 212. In order to define the extent of the sewage
collection system for purposes of co-permittee regulation— i.e. , to identify the boundary between
the portions of the collection system that are subject to NPDES requirements and those that are
not—Region 1 is relying on EPA’s regulatory interpretation of the term “sewage collection
system.” In relevant part, EPA regulations define “sewage collection system” at 40 C.F.R. §
35.905 as: 
“ .... each, and all, of the common lateral sewers, within a publicly owned treatment 
system, which are primarily installed to receive waste waters directly from facilities
which convey waste water from individual structures or from private property and which
include service connection “Y” fittings designed for connection with those facilities. The
facilities which convey waste water from individual structures, from private property to
the public lateral sewer, or its equivalent, are specifically excluded from the
definition….” 
Put otherwise, a municipal satellite collection system is subject to NPDES jurisdiction under the
Region’s approach insofar as its purpose is to be a common carrier of wastewater for others to a
POTW treatment plant for treatment. The use of this primary purpose test (i.e., common sewer
installed as a recipient and carrier waste water from others) allows Region 1 to draw a principled,
predictable and readily ascertainable boundary between the POTW’s collection system and user.
This test would exclude, for example, branch drainpipes that collect and transport wastewater
from fixtures in a commercial building or public school to the common lateral sewer. This type 
treatment plant” will be used to designate that portion of the municipal system which is actually designed to provide
treatment to the wastes received by the municipal system.” 
8 See, e.g. , United States v. Borowski, 977 F.2d 27, 30 n.5 (1st Cir. 1992) (“We read this language [POTW
definition] to refer to such sewers, pipes and other conveyances that are publicly owned. Here, for example, the City
of Burlington's sewer is included in the definition because it conveys waste water to the Massachusetts Water
Resource Authority's treatment works.”); Shanty Town Assoc. v. Envtl. Prot. Agency, 843 F.2d 782, 785 (4th Cir. 
1988) (“As defined in the statute, a ‘treatment work’ need not be a building or facility, but can be any device,
system, or other method for treating, recycling, reclaiming, preventing, or reducing liquid municipal sewage and
industrial waste, including storm water runoff.”) (citation omitted); Comm. for Consideration Jones Fall Sewage
System v. Train, 375 F. Supp. 1148, 1150-51 (D. Md. 1974) (holding that NPDES wastewater discharge permit
coverage for a wastewater treatment plant also encompasses the associated sanitary sewer system and pump stations
under § 1292 definition of “treatment work”).

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of infrastructure would not be considered part of the collection system, because it is not designed
to be a common recipient and carrier of wastewaters from other users. Rather, it is designed to
transport its users’ wastewater to such a common collection system at a point further down the
sanitary sewer system. 
EPA’s reliance on the definition of “sewage collection system” from outside the NPDES
regulations for interpretative guidance is reasonable as the construction grants regulations at 40 
C.F.R. Part 35, subpart E pertain to grants for POTWs, the entity that is the subject of this
NPDES policy. Additionally, the term “sewage collection systems” expressly appears in the
definition of treatment works under section 212 of the Act as noted above. Finally, this approach
is also consistent with EPA’s interpretation in other contexts, such as the SSO listening session
notice, published in the Federal Register on June 1, 2010, which describes wastewater collection
systems as those that “collect domestic sewage and other wastewater from homes and other
buildings and convey it to wastewater sewage treatment plants for proper treatment and
disposal.” See “Municipal Sanitary Sewer Collection Systems, Municipal Satellite Collection
Systems, Sanitary Sewer Overflows, and Peak Wet Weather Discharges From Publicly Owned
Treatment Works Treatment Plants Serving Separate Sanitary Sewer Collection Systems,” 75
Fed. Reg. 30395. 9 
(3) Do municipal satellite collection systems “discharge [] a pollutant” within the meaning of
the statute and regulations? 
Yes, because they are a part of the POTW, municipal satellite collection systems discharge
pollutants to waters of the United States through one or more outfalls (point sources). 
The “discharge of a pollutant,” triggers the need for a facility to obtain an NPDES permit. A
POTW “discharges [ ] pollutant[s]” if it adds pollutants from a point source to waters of the U.S.
(See 40 C.F.R. § 122.2, section (a) of the definition of “discharge of a pollutant.”) As explained
above, municipal satellite collection systems are part of the POTW. The entire POTW is the
entity that discharges pollutants to waters of the U.S. through point source outfalls typically
located at the treatment plant but also occasionally through other outfalls within the overall
system. The fact that a collection system may be located in the upstream portions of the POTW
and not necessarily near the ultimate discharge point at the treatment plant is not material to the
question of whether it “discharges” a pollutant and consequently may be subject to conditions of
an NPDES permit issued for discharges from the POTW. 10 
9 That EPA has in the past looked for guidance from Part 35 when construing the NPDES permitting program, for
instance, in the context of storm water permitting, provides further support to the Region that its practice in this
regard is sound. See, e.g. , “National Pollutant Discharge Elimination System Permit Application Regulations for
Storm Water Discharges,” 55 Fed. Reg. 47990, 47955 (looking to the definition of “storm sewer” at 40 C.F.R. §
35.2005(b)(47) when defining “storm water” under the NDPES program). 
10 This position differs from that taken by the Region in the Upper Blackstone litigation. There, the Region argued
that the treatment plant was the sole discharging entity for regulatory purposes. The Region has revised this view
upon further consideration of the statute, regulations and case law and determined that the POTW as a whole is the
discharging entity.

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“Discharge of a pollutant” at 40 C.F.R. § 122.2 is also defined to include “… discharges through
pipes, sewers, or other conveyances owned by a State, municipality, or other person which do not
lead to a treatment works. ”(emphasis added). Some municipal collection systems have argued
that this sentence means that only municipal discharges that do not lead to a “treatment plant”
fall within the scope of “discharge of a pollutant.” They further argue that because discharges
through satellite collection systems do lead to a treatment plant, such systems do not “discharge
[] pollutant[s]” and therefore are not subject to the NPDES permit requirements. This argument
is flawed in that it incorrectly equates “treatment works,” the term used in the definition above,
with “treatment plant.” To interpret “treatment works” as it appears in the regulatory definition
of “discharge of a pollutant” as consisting of only the POTW treatment plant would be
inconsistent with the definition of “treatment works” at 40 C.F.R. § 403.3(q), which expressly
includes the collection system. See also § 403.3(r) (defining “POTW Treatment Plant” as “ that
portion [emphasis added] of the POTW which is designed to provide treatment (including
recycling and reclamation) of municipal sewage and industrial waste”). 
(4) Are municipal satellite collection systems “indirect dischargers” and thus excluded from
NPDES permitting requirements? 
No, municipal satellite collection systems are part of the POTW, not “indirect dischargers” to the
POTW. 
Section 307(b) of the Act requires EPA to establish regulatory pretreatment requirements to
prevent the “introduction of pollutants into treatment works” that interfere, pass through or are
otherwise incompatible with such works. Section 307 is implemented through the General
Pretreatment Regulations for Existing and New Sources of Pollution (40 C.F.R. Part 403) and
categorical pretreatment standards (40 C.F.R. Parts 405-471). Section 403.3(i) defines “indirect
discharger” as “any non-domestic” source that introduces pollutants into a POTW and is
regulated under pretreatment standards pursuant to CWA § 307(b)-(d). The source of an indirect
discharge is termed an “industrial user.” Id . at § 403.3(j). Under regulations governing the
NPDES permitting program, the term “indirect discharger” is defined as “a non-domestic
discharger introducing ‘pollutants’ to a ‘publicly owned treatment works.’” 40 C.F.R. § 122.2.
Indirect dischargers are excluded from NPDES permit requirements by the indirect discharger
rule at 40 C.F.R. § 122.3(c), which provides, “The following discharges do not require an
NPDES permit: . . . The introduction of sewage, industrial wastes or other pollutants into
publicly owned treatment works by indirect dischargers.” 
Municipal satellite collection satellite systems are not indirect dischargers as that term is defined under
part 122 or 403 regulations. Unlike indirect dischargers, municipal satellite collection systems are not
“introducing pollutants” to POTWs under 40 C.F.R. § 122.2; they are, instead, part of the POTW by
definition. Similarly, they are not a non-domestic source that introduces pollutants into a POTW
within the meaning of § 403.3(j), but as part of the POTW collect and convey municipal sewage from
industrial, commercial and domestic users of the POTW. 
The Region’s determination that municipal satellite collection systems are not indirect
dischargers is, additionally, consistent with the regulatory history of the term indirect discharger.

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The 1979 revision of the part 122 regulations defined “indirect discharger” as “a non-municipal,
non-domestic discharger introducing pollutants to a publicly owned treatment works, which
introduction does not constitute a ‘discharge of pollutants’…” See National Pollutant Discharge
Elimination System, 44 Fed. Reg. 32854, 32901 (June 7, 1979). The term “non-municipal” was 
removed in the Consolidated Permit Regulations, 45 Fed. Reg. 33290, 33421 (May 19, 1980)
(defining “indirect discharger” as “a nondomestic discharger…”). Although the change was not
explained in detail, the substantive intent behind this provision remained the same. EPA
characterized the revision as “minor wording changes.” 45 Fed. Reg. at 33346 (Table VII:
“Relationship of June 7[, 1979] Part 122 to Today’s Regulations”). The central point again is
that under any past or present regulatory incarnation, municipal satellite collection systems, as
POTWs, are not within the definition of “indirect discharger,” which is limited to dischargers
that introduce pollutants to POTWs. 
The position that municipal satellite collection systems are part of, rather than discharge to, the
POTW also is consistent with EPA guidance. EPA’s 1994 Multijurisdictional Pretreatment
Programs Guidance Manual, (EPA 833-B94-005) (June 1994), at p. 19, asserts that EPA has the
authority to require municipal satellite collection systems to develop pretreatment programs by
virtue of their being part of the POTW. 
(5) How is the Region’s rationale consistent with the references to “municipality” in the
regulatory definition of POTW found at 40 C.F.R. § 403.3(q), and the definition’s statement that
“[t]he term also means the municipality….which has jurisdiction over the Indirect Discharges to
and the discharges from such a treatment works?” 
There is no inconsistency between the Region’s view that municipally-owned satellite collection
systems are part of a POTW, and the references to municipality in 40 C.F.R. § 403.3(q),
including the final sentence of the regulatory definition of POTW in the pretreatment regulations. 
The Region’s co-permitting rationale is consistent with the first part of the pretreatment
program’s regulatory definition of POTW, because the Region is only asserting NPDES
jurisdiction over satellite collection systems that are owned by a “State or municipality (as
defined by section 502(4) of the Act).” The term “municipality” as defined in CWA § 502(4)
“means a city, town, borough, county, parish, district, association, or other public body created
by or pursuant to State law and having jurisdiction over disposal of sewage, industrial wastes, or
other wastes…” Thus, in order to qualify under this definition, a wastewater collection system
need only be “owned by a State or municipality.” There is no requirement that the constituent
components of a regionally integrated POTW, i.e. , the collection system and regional centralized
POTW treatment plant, be owned by the same State or municipal entity. 
Furthermore, there is no inconsistency between the Region’s view that a satellite collection
system is part of a POTW, and the final sentence of the regulatory definition of POTW in the
pretreatment regulations. As noted above, the sentence provides that “POTW” may “also” mean
a municipality which has jurisdiction over indirect discharges to and discharges from the
treatment works. This is not a limitation because of the use of the word “also” (contrast this with
the “only if” language in the preceding sentence of the regulatory definition).

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(6) How does the Region’s rationale comport with the permit application and signatory
requirements under NPDES regulations? 
EPA’s authority to require municipal satellite collection systems to separately comply with the
permit application requirements, or to provide waivers from these requirements where
appropriate, is consistent with NPDES regulations, which provide that all POTWs must submit
permit application information set forth in 40 C.F.R. § 122.21(j) unless otherwise directed, and
municipal satellite collection systems are part of the POTW. 
EPA has the authority to require municipal satellite collection systems to submit permit
applications. These entities are operators of parts of the POTW. NPDES regulations
characterize the operator “of the POTW” (which by definition includes the sewage collection
system) as opposed to the operator “of the POTW treatment plant” as an appropriate applicant. 
Id. § 122.21(a), (requiring applicants for “new and existing POTWs” to submit information
required in 122.21(j),” which in turn requires “all POTWs,” among others, to provide permit
application information). This reading of the regulation is in keeping with the statutory text,
which subjects the POTW writ large to the secondary treatment and water quality-based
requirements. See CWA § 301(b)(1)(B), (C). In fact, the NPDES permit application for POTWs
solicits information concerning portions of the POTW beyond the treatment plant itself,
including the collection system used by the treatment works. See 40 C.F.R. 122.21(j)(1). 
Notwithstanding that EPA could require applications for all the municipal satellite collection
systems, requiring such applications may result in duplicative or immaterial information. The
Regional Administrator (“RA”) may waive any requirement of this paragraph if he or she has
access to substantially identical information. 40 C.F.R. § 122.21(j). See generally , 64 Fed. Reg.
42440 (August 4, 1999). The RA may also waive any application requirement that is not of
material concern for a specific permit. Region 1 believes that it will typically receive
information sufficient for NPDES permitting purposes from the POTW treatment plant
operator’s application. 
In most cases, EPA Region 1 believes that having a single permit application from the POTW
treatment plant operator will be more efficient in carrying out the regulation’s intent than
multiple applications from the satellite systems. (The treatment plant operator would of course
be required to coordinate as necessary with the constituent components of the POTW to ensure
that the information provided to EPA is accurate and complete). EPA Region 1 therefore intends
to issue waivers to exempt municipal satellite collection systems from permit application and
signatory requirements in accordance with 40 C.F.R. § 122.21(j). To the extent the Region
requires additional information, it intends to use its information collection authority under CWA 
§ 308. 
IV. Basis for the Specific Conditions to which the Municipal Satellite Collection Systems are 
Subject as Co-permittees

Fact Sheet Permit No.MA0103284
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Appendix D: Permitting Approach for POTWs with Co-permittees 
17 
The legal authority for extending NPDES conditions to all portions of the municipally-owned
treatment works to ensure proper operation and maintenance and to reduce the quantity of
extraneous flow into the POTW is Section 402(a) of the CWA. This section of the Act
authorizes EPA to issue a permit for the “discharge of pollutants” and to prescribe permit
conditions as necessary to carry out the provisions of the CWA, including Section 301 of the
Act. Among other things, Section 301 requires POTWs to meet performance-based requirements
based on secondary treatment technology, as well as any more stringent requirements of State
law or regulation, including water quality standards. See CWA § 301(b)(1)(B),(C). 
The co-permittee requirements are required to assure continued achievement of secondary
treatment requirements and water quality standards in accordance with sections 301 and 402 of
the Act and to prevent unauthorized discharges of sewage from collection systems. With respect
to secondary treatment, the inclusion of the satellite systems as co-permittees is necessary
because high levels of I/I dilute the strength of influent wastewater and increase the hydraulic
load on treatment plants, which can reduce treatment efficiency ( e.g. , result in violations of
technology-based percent removal limitations for BOD and TSS due to less concentrated
influent, or violation of other technology effluent limitations due to reduction in treatment
efficiency), lead to bypassing a portion of the treatment process, or in extreme situations make
biological treatment facilities inoperable ( e.g. , wash out the biological organisms that treat the
waste). 
As to water quality standards, the addition of the satellite systems as co-permittees is necessary
to ensure collection system operation and maintenance, which will reduce extraneous flow
entering the system and free up available capacity. This will facilitate compliance with water
quality-based effluent limitations—made more difficult by reductions in treatment efficiency
and also reduce water quality standard violations that result from the occurrence of SSOs. See
Exhibits B (Municipal satellite collection systems with SSOs) and C (Analysis of extraneous
flow trends for representative systems). SSOs that reach waters of the U.S. are discharges in
violation of section 301(a) of the CWA to the extent not authorized by an NPDES permit. 
Subjecting portions of an NPDES-regulated entity upstream of the ultimate discharge point is
consistent with EPA’s interpretation of the CWA in other contexts. For example, it is well
established that EPA has the ability to apply discharge limitations and monitoring requirements
to internal process discharges, rather than to outfalls, on the grounds that compliance with permit
limitations “may well involve controls applied at points other than the ultimate point of
discharge.” See Decision of the General Counsel No. 27 (In re Inland Steel Company) , August
4, 1975 (“Limitations upon internal process discharges are proper, if such discharges would
ultimately be discharged into waters of the United States, and if such limitations are necessary to
carry out the principal regulatory provisions of the Act.”). In the case of regionally integrated
POTWs, placing conditions on satellite collection systems—though located farther up the system
than the point of discharge—is a logical implication of the regulations and serves to effectuate
the statute. 
Without imposing conditions on the satellite communities, standard permit conditions applicable
to all NPDES permits by regulation cannot be given full effect. To illustrate, there is no dispute

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Appendix D: Permitting Approach for POTWs with Co-permittees 
18 
that the operator of the POTW treatment plant and outfall is discharging pollutants within the
meaning the CWA and, accordingly, is subject to the NPDES permit program. NPDES
permitting regulations require standard conditions that “apply to all NPDES permits,” pursuant
to 40 C.F.R. § 122.41, including a duty to mitigate and to properly operate and maintain “all
facilities and systems of treatment and control (and related appurtenances) which are installed or
used by the permittee to achieve compliance with the conditions of the permit.” Id. at §
122.41(d), (e). EPA regulations also require additional conditions applicable to specified
categories of NPDES permit, including “Publicly owned treatment works.” See id. at §
122.42(b). A municipal satellite collection system, as demonstrated above, falls within the
regulatory definition of a POTW. In light of EPA’s authority to require appropriate operation
and maintenance of collection systems necessary to achieve compliance with an NPDES permit,
and because the operator of the POTW treatment plant may not own or operate a significant
portion of the wider treatment works ( i.e. , the collection systems that send flow to the POTW
treatment plant), it is appropriate, and in some cases necessary, to extend pertinent, mandated
standard conditions to all portions of the POTW, which is subject to regulation in its entirety. 
The alternative of allowing state and local jurisdictional boundaries to place significant portions
of the POTW beyond the reach of the NPDES permitting program would not only be
inconsistent with the broad statutory and regulatory definition of the term POTW but would
impede Region 1 from carrying out the objectives of the CWA. It would also, illogically,
preclude the Region from imposing on POTWs standard conditions EPA has by regulation
mandated for those entities. 
Other Considerations Informing EPA Region 1’s Decision to Use a Co-permittee Permitting 
Structure for Regionally Integrated POTWs 
In addition to consulting the relevant statutes, regulations, and preambles, Region 1 also
considered other EPA guidance in coming to its determination to employ a co-permittee structure
for regionally integrated POTWs. EPA’s 1994 Multijurisdictional Pretreatment Programs
Guidance Manual, p. 19, asserts that EPA has the authority to include municipal satellite
collection systems as co-permittees by virtue of their being part of the POTW: 
If the contributing jurisdiction owns or operates the collection system within its
boundaries, then it is a co-owner or operator of the POTW. As such, it can be included
on the POTW’s NPDES permit and be required to develop a pretreatment program. 
Contributing jurisdictions should be made co-permittees where circumstances or
experience indicate that it is necessary to ensure adequate pretreatment program
implementation. 
The same logic that led EPA to conclude it had authority to require municipal satellite collection
systems to develop a pretreatment program pursuant to an NPDES permit supports EPA Region
1’s decision to impose permit conditions on such facilities to undertake proper O & M and to
reduce inflow and infiltration. 
EPA Region 1 also took notice of federal listening session materials on the June 2010 proposed
SSO rule and associated model permits and fact sheet. The position articulated by EPA in these

Fact Sheet Permit No.MA0103284
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Appendix D: Permitting Approach for POTWs with Co-permittees 
19 
model documents—specifically the application of standard NPDES conditions to municipal
satellite collection systems—generally conform to Region 1’s co-permitting approach. 
Finally, in addition to federal requirements, EPA Region 1 considered the co-permittee approach
in light of state regulations and policy pertaining to wastewater treatment works. The Region
found its approach to be consistent with such requirements. Under Massachusetts law, “Any
person operating treatment works shall maintain the facilities in a manner that will ensure proper
operation of the facilities or any part thereof,” where “treatment works” is defined as “any and
all devices, processes and properties, real or personal, used in the collection, pumping,
transmission, storage, treatment, disposal, recycling, reclamation or reuse of waterborne
pollutants, but not including any works receiving a hazardous waste from off the site of the
works for the purpose of treatment, storage or disposal, or industrial wastewater holding tanks
regulated under 314 CMR 18.00” See 314 CMR 12.00 (“Operation and Maintenance and
Pretreatment Standards for Wastewater Treatment Works and Indirect Dischargers”). MassDEP
has also prioritized this area, issuing detailed operation and maintenance guidelines entitled
“Optimizing Operation, Maintenance and Rehabilitation of Sanitary Sewer Collection Systems.”

Fact Sheet Permit No.MA0103284
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Appendix D: Permitting Approach for POTWs with Co-permittees 
20 
Exhibit A 
Permit
Number Permittee Co-permittees Issue Date with 
Co-permittees 
MA0100404 Massachusetts Water Resources
Authority – Clinton 
Town of Clinton 
September 27, 2000 Lancaster Sewer
District 
MA0101010 City of Brockton Town of Abington May 11, 2005 
Town of Whitman 
MA0100412 Westborough Wastewater
Treatment Plant 
Town of Westborough 
May 20, 2005 Town of Shrewsbury 
Town of Hopkinton 
MA0100480 City of Marlborough Town of Northborough May 26, 2005 
MA0100447 Greater Lawrence Sanitary District 
City of Lawrence, 
August 11, 2005 
Town of Andover, 
Town of North
Andover, 
Town of Methuen, 
Town of Salem, NH 
MA0100633 Lowell Regional Wastewater
Utilities 
Town of Chelmsford, 
September 1, 2005 
Town of Dracut 
Town of Tewksbury 
Town of Tyngsborough 
MA0100064 Pepperell Wastewater Treatment
Plant Town of Groton December 22, 2005 
MA0100439 Town of Webster Sewer
Department Town of Dudley March 24, 2006 
MA0100455 Town of South Hadley, Board of
Selectmen 
Town of Granby, June 12, 2006 
Town of Chicopee 
MA0100617 City of Leominster (NPDES Permit
No. MA0100617) 
Town of Lunenberg September 28, 2006 
Town of Lancaster 
MA0100510 Hoosac Water Quality District 
Town of Williamstown 
September 28, 2006 Town of North Adams 
Town of Clarksburg 
MA0101036 Board of Public Works, North
Attleborough Town of Plainville January 4, 2007 
NH0100544 Town of Sunapee New London Sewer
Commission February 21, 2007 
MA0100552 Lynn Water and Sewer Commission
(NPDES Permit No. MA0100552) 
Town of Nahant 
March 3, 2007 Town of Swampscott 
Town of Saugus 
NH0100331 City of Concord Boscawen Board of
Selectmen June 29, 2007

Fact Sheet Permit No.MA0103284
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Appendix D: Permitting Approach for POTWs with Co-permittees 
21 
Permit
Number Permittee Co-permittees Issue Date with 
Co-permittees 
NH0100790 City of Keene (NPDES Permit No.
NH0100790) 
Town of Marlborough,
NH August 24, 2007 
Swanzey Sewer
Commission 
NH0100625 Town of Hampton Rye Sewer Commission August 28, 2007 
NH0100161 Town of Merrimack, NH Town of Bedford September 25, 2007 
MA0101621 City of Haverhill Town of Groveland December 5, 2007 
MA0101681 City of Pittsfield, Department of
Public Works 
Town of Dalton 
August 22, 2008 
Town of Lenox 
Town of Hinsdale 
Town of Lanesborough 
Town of Richmond 
NH0100447 City of Manchester 
Town of Goffstown 
September 25, 2008 Town of Bedford 
Town of Londonderry 
MA0100781 City of New Bedford Town of Acushnet September 28, 2008 
Town of Dartmouth 
MA0101818 City of Northhampton Town of Williamsburg September 30, 2008 
NH0100960 
Winnipesaukee River Basin
Program Wastewater Treatment
Plant 
Town of Belmont 
June 19, 2009 
Town of Center Harbor 
City of Franklin 
Town of Gilford 
City of Laconia 
Town of Meredith 
Town of Northfield 
Town of Tilton 
MA0101800 City of Westfield Town of Southwick September 30, 2009 
MA0101231 Hull Permanent Sewer Commission 
Cohasset Sewer
Commission September 1, 2009 
Hingham Sewer
Commission 
MA0100994 Gardner Department of Public
Works Town of Ashburnham September 30, 2009 
MA0102598 Charles River Pollution Control
District 
Town of Franklin 
July 23, 2014 
Town of Medway 
Town of Millis 
Town of Bellingham 
MA0101702 MFN Region Wastewater District 
Town of Mansfield 
September 11, 2014 Town of Norton 
Town of Foxboro

Fact Sheet Permit No.MA0103284
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Appendix D: Permitting Approach for POTWs with Co-permittees 
22 
Permit
Number Permittee Co-permittees Issue Date with 
Co-permittees 
MA0100897 Taunton Wastewater Treatment
Plant 
Town of Raynham April 10, 2015 
Town of Dighton 
NH0100366 City of Lebanon, NH Town of Enfield September 30, 2015 
NH0100099 Town of Hanover, NH City of Lebanon November 18, 2015 
MA0100501 South Essex Sewerage District 
City of Beverly, 
May 5, 2016 
Town of Danvers 
Town of Marblehead 
City of Peabody 
City of Salem 
NH0100471 Town of Milford, NH Town of Wilton Sewer
Commission August 31, 2020 
MA0101613 Springfield Regional Wastewater
Treatment Facility 
Town of Agawam 
September 30, 2020 
Town of East
Longmeadow 
Town of Longmeadow 
Town of Ludlow 
Town of West
Springfield 
Town of Wilbraham 
NH0101390 Town of Allenstown, NH Town of Pembroke
Sewer Commission November 29, 2021 
NH0100901 
Town of Concord - Concord Hall
Street Wastewater Treatment
Facility 
Town of Bow July 1, 2022 
MAG590000 2022 Medium Wastewater
Treatment Facilities General Permit (as authorized) September 28, 2022

Fact Sheet Permit No.MA0103284
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Appendix D: Permitting Approach for POTWs with Co-permittees 
23 
Charles River WPCD Daily Maximum Flow Daily Max Flow 
April 2001- April 2010 Nonexcessive I/I Flow
Monthly Total Rainfall
24. 50
45
40
18.
35
30
12. 25
20
15
6.
10
5
. 0
Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 
Date
Flow (MGD)
Precipitation (in.) 
Exhibit B 
I/I Flow Analysis for Sample Regional Publicly Owned Treatment Works 
I. Representative POTWS 
The South Essex Sewer District (SESD) is a regional POTW with a treatment plant in Salem,
Massachusetts. The SESD serves a total population of 174,931 in six communities: Beverly,
Danvers, Marblehead, Middleton, Peabody and Salem. The Charles River Pollution Control
District (CRPCD) is a regional POTW with a treatment plant in Medway, Massachusetts. The
CRPCD serves a total population of approximately 28,000 in four communities: Bellingham,
Franklin, Medway and Millis. Both of these facilities have been operating since 2001 under
permits that place requirements on the treatment plant to implement I/I reduction programs with
the satellite collection systems, in contrast to Region 1’s current practice of including the satellite
collection systems as co-permittees. 
II. Comparison of flows to standards for nonexcessive infiltration and I/I 
Flow data from the facilities’ discharge monitoring reports (DMRs) are shown in comparison to
the EPA standard for nonexcessive infiltration/inflow (I/I) of 275 gpcd wet weather flow and the
EPA standard for nonexcessive infiltration of 120 gallons per capita per day (gpcd) dry weather
flow; the standards are multiplied by population served for comparison with total flow from the
facility. See I/I Analysis and Project Certification , EPA Ecol. Pub. 97-03 (1985); 40 CFR
35.2005(b)(28) and (29). 
Figures 1 and 2 show the Daily Maximum Flows (the highest flow recorded in a particular
month) for the CRPCD and SESD, respectively, along with monthly precipitation data from
nearby weather stations. Both facilities experience wet weather flows far exceeding the standard
for nonexcessive I/I, particularly in wet months, indicating that these facilities are receiving high
levels of inflow and wet weather infiltration. 
Figure 1. CRPCD Daily Maximum Flow Compared to Nonexcessive I/I Standard

Fact Sheet Permit No.MA0103284
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Appendix D: Permitting Approach for POTWs with Co-permittees 
24 
SESD Daily Maximum Flow Daily Max Flow
100.
90.
80.
70.
60.
50.
40.
30.
20.
10.
. 
April 2001- April 2010 Nonexcessive Infiltration Flow
Monthly Total Rainfall
36.
31.
26.
21.
16.
11.
6.
1.
-4.
Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 
Date 
Flow (MGD)
Precipitation (in.) 
Charles River WPCD Average Monthly Flow Average Monthly Flow 
April 2001- April 2010 Nonexcessive Infiltration Flow
Monthly Total Rainfall
7. 50
45
6.
40
5. 35
30
4.
25
3.
20
2. 15
10
1.
5
. 0
Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 
Date 
Flow (MGD)
Precipitation (in.) 
Figure 2. SESD Daily Maximum Flow Compared to Nonexcessive I/I Standard 
Figures 3 and 4 shows the Average Monthly Flows for the CRPCD and SESD, which exceed the
nonexcessive infiltration standard for all but the driest months. This indicates that these systems
experience high levels of groundwater infiltration into the system even during dry weather. 
Figure 3. CRPCD Monthly Average Flow Compared to Nonexcessive Infiltration Standard

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Appendix D: Permitting Approach for POTWs with Co-permittees 
25 
SESD Monthly Average Flow Monthly Average Flow 
April 2001- April 2010 Non Excessive Infiltration Flow
Monthly Total Rainfall
60. 36.
50.
40.
30.
20.
10.
.
32.
28.
24.
20.
16.
12.
8.
4.
.
Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 
Date 
Flow (MGD)
Precipitation (in.) 
24. 
Charles River WPCD Daily Maximum Flow
April 2001- April 2010 
Daily Max Flow
Monthly Total Rainfall
Linear (Daily Max Flow)
50
45
40
18.
35
30
12. 25
20
15
6.
10
5
. 0
Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 
Date 
Flow (MGD)
Precipitation (in.) 
Figure 4. SESD Monthly Average Flow Compared to Nonexcessive Infiltration Standard 
II. Flow Trends 
Figures 5 and 6 show the trend in Maximum Daily Flows over the period during which these
regional facilities have been responsible for implementing cooperative I/I reduction programs
with the satellite collection systems. The Maximum Daily Flow reflects the highest wet weather
flow for each month. The trend over this time period has been of increasing Maximum Daily
Flow, indicating that I/I has not been reduced in either system despite the permit requirements. 
Figure 5. CRPCD Daily Maximum Flow Trend

Fact Sheet Permit No.MA0103284
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Appendix D: Permitting Approach for POTWs with Co-permittees 
26 
SESD Daily Maximum Flow Trend Daily Max Flow
100.
90.
80.
70.
60.
50.
40.
30.
20.
10.
. 
April 2001- April 2010 Monthly Total Rainfall
Trendline of Daily Max Flow
36.
31.
26.
21.
16.
11.
6.
1.
-4.
Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 
Date 
Flow (MGD)
Precipitation (in.) 
Charles River WPCD TSS and CBOD Violations 
Daily Max Flow
Nonexcessive I/I Flow
TSS % Removal Violations 
April 2001- April 2010 CBOD Concentration Violations
TSS Concentration Violation
Monthly Total Rainfall
25. 50
45
20. 40
35
15. 30
25
10. 20
15
5. 10
5
.
Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 
Date 
Jan-06 Jan-07 Jan-08 Jan-09
0
Jan-10 Jan-11 
Flow (MGD)
Precipitation (in.) 
Figure 6. SESD Daily Maximum Flow Trend 
III. Violations Associated with Wet Weather Flows 
Both the CRPCD and SESD have experienced permit violations that appear to be related to I/I,
based on their occurrence during wet weather months when excessive I/I standards are exceeded.
Figure 7 shows violations of CRPCD’s effluent limits for CBOD (concentration) and TSS
(concentration and percent removal). Twelve of the sixteen violations occurred during months
when daily maximum flows exceeded the EPA standard. 
Figure 7. CRPCD CBOD and TSS Effluent Limit Violations

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Appendix D: Permitting Approach for POTWs with Co-permittees 
27 
SESD Percent Removal of CBOD CBOD Percent Removal
120%
100%
80%
60%
40%
20%
0% 
April 2001- April 2010 Percent Removal Limit
Max Daily Flow
100.
90.
80.
70.
60.
50.
40.
30.
20.
10.
.
Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 
Date 
CBOD Percent Removal
Flow (MGD) 
Figure 8 shows SESD’s results for removal of CBOD, in percentage, as compared to maximum
daily flow. SESD had three permit violations where CBOD removal fell below 85%, all during
months with high Maximum Daily Flows. 
Figure 8. SESD CBOD Percent Removal 
In addition, both of these regional POTWs have experienced SSOs within the municipal satellite
collection systems. In the SESD system, Beverly, Danvers, Marblehead and Peabody have
reported SSOs between 2006 and 2008, based on data provided by MassDEP. In the CRPCD
system, both Franklin and Bellingham have reported SSOs between 2006 and 2009.

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Appendix D: Permitting Approach for POTWs with Co-permittees 
28 
Exhibit C 
Form of Regional Administrator’s waiver of permit application requirements 
for municipal satellite collection systems 
Re: Waiver of Permit Application and Signatory Requirements for [Municipal Satellite
Sewage Collection System] 
Dear : 
Under NPDES regulations, all POTWs must submit permit application information set forth in
40 C.F.R. § 122.21(j) unless otherwise directed. Where the Region has “access to substantially
identical information,” the Regional Administrator may waive permit application requirements
for new and existing POTWs. Id. Pursuant to my authority under this regulation, I am waiving
NPDES permit application and signatory requirements applicable to the above-named municipal
satellite collection systems. 
Although EPA has the authority to require municipal satellite collection systems to submit
individual permit applications, in this case I find that requiring a single permit application
executed by the regional POTW treatment plant owner/operator will deliver “substantially
identical information,” and will be more efficient, than requiring separate applications from each
municipal satellite collection system owner/operator. Municipal satellite collection system
owners/operators are expected to consult and coordinate with the regional POTW treatment plant
operators to ensure that any information provided to EPA about their respective entities is
accurate and complete. In the event that EPA requires additional information, it may use its
information collection authority under CWA § 308. 33 U.S.C. § 1318. 
This notice reflects my determination based on the specific facts and circumstances in this case.
It is not intended to bind the agency in future determinations where a separate permit for
municipal satellites would not be duplicative or immaterial. 
If you have any questions or would like to discuss this decision, please contact [EPA Permit Contact] at 
mailto: permit.writer@epa.gov or 617-918-XXXX. 
Sincerely, 
Regional Administrator

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Date Sampling Station Cadmium Copper Nickel Lead 
7/27/2021 N21A 0.32 4.0 0.78 0.86 
7/27/2021 N21D <4.0 5.6 < 8 <4.0 
7/27/2021 N04A <4.0 a — < 8 <4.0 
7/27/2021 N04D <4.0 1.6 < 8 <4.0 
7/27/2021 F13A 0.80 3.5 0.93 1.50 
7/27/2021 F13D 0.45 <12 0.71 0.95 
7/29/2021 N21A 0.12 1.5 < 8.0 0.38 
7/29/2021 N21D <4.0 <12 <8.0 0.35 
7/29/2021 N04A <4.0 <12 <8.0 <4.0 
7/29/2021 N04D <4.0 <12 <8.0 <4.0 
7/29/2021 F13A <4.0 <12 <8.0 <4.0 
7/29/2021 F13D <4.0 <12 <8.0 <4.0 
8/3/2021 N21A 0.15 b — c — <4.0 
8/3/2021 N21D <4.0 b — c — <4.0 
8/3/2021 N04A <4.0 b — c — <4.0 
8/3/2021 N04D <4.0 b — c — <4.0 
8/3/2021 F13A <4.0 b — c — <4.0 
8/3/2021 F13D <4.0 b — c — <4.0 
8/4/2021 N21A <4.0 b — 3.0 <4.0 
8/4/2021 N21D <4.0 b — 2.4 <4.0 
8/4/2021 N04A <4.0 b — 2.8 <4.0 
8/4/2021 N04D <4.0 b — 2.9 <4.0 
8/4/2021 F13A <4.0 b — 2.6 <4.0 
8/4/2021 F13D <4.0 b — 3.0 <4.0 
8/25/2021 N21A <4.0 c — d — <4.0 
8/25/2021 N21D <4.0 c — d — <4.0 
8/25/2021 N04A <4.0 c — d — <4.0 
8/25/2021 N04D <4.0 c — d — <4.0 
8/25/2021 F13A <4.0 c — d — <4.0 
8/25/2021 F13D <4.0 c — d — <4.0 
Results by sampling date and sample location 
a — Duplicate QC failure 
b — Results are <
PQL but are not
usable because of
high dilution of
samples and high
PQL 
1 of 55

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Appendix E:Ambient Data 
c — Field-QC blank contamination 
d — Method blank contamination 
e — Lab and field QC not within method control limit 
LOCATION Location identifiers
combine the area and
station identifier with
the depth code 
station identifiers: 
N21 Center of outfall
diffuser (42.3878333, - 
70.785333) 
N04 Northeastern corner
of nearfield
(42.4438333, - 
70.7365) 
F13 ENE of Cohasset
Harbor, Mass Bay
south of outfall site
(42.2683333, -70.735) 
depth codes: 
A surface (within 2 m of
the surface) 
D subpycnocline 
Note: On July 27 and
August 25, the D-
depth samples were
collected
approximately 10-15
m from the bottom.
On July 29 and August
3 and 4, D-depth
samples were
approximately 2 m
from the bottom. 
2 of 55

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Appendix E:Ambient Data 
Date Sampling Station Zinc TOC 
7/27/2021 N21A 20 1.7 
7/27/2021 N21D 33 1.3 
7/27/2021 N04A 38 1.8 
7/27/2021 N04D <40 1.1 
7/27/2021 F13A 35 1.7 
7/27/2021 F13D <40 1.3 
7/29/2021 N21A <40 1.7 
7/29/2021 N21D <40 1.3 
7/29/2021 N04A <40 1.7 
7/29/2021 N04D <40 1.2 
7/29/2021 F13A <40 1.8 
7/29/2021 F13D <40 1.2 
8/3/2021 N21A <40 1.8 
8/3/2021 N21D <40 1.3 
8/3/2021 N04A <40 1.8 
8/3/2021 N04D <40 1.1 
8/3/2021 F13A <40 1.8 
8/3/2021 F13D <40 1.2 
8/4/2021 N21A <40 1.7 
8/4/2021 N21D <40 1.3 
8/4/2021 N04A <40 1.7 
8/4/2021 N04D <40 1.1 
8/4/2021 F13A <40 1.6 
8/4/2021 F13D <40 1.3 
8/25/2021 N21A e — 1.6 
8/25/2021 N21D e — 1.2 
8/25/2021 N04A e — 1.4 
8/25/2021 N04D e — 1.2 
8/25/2021 F13A e — 1.4 
8/25/2021 F13D e — 1.3 
Results by sampling date and sample location 
a — Duplicate QC failure 
b — Results are <
PQL but are not
usable because of
high dilution of
samples and high
PQL 
3 of 55

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Appendix E:Ambient Data 
c — Field-QC blank contamination 
d — Method blank contamination 
e — Lab and field QC not within method control limit 
LOCATION Location identifiers
combine the area and
station identifier with
the depth code 
station identifiers: 
N21 Center of outfall
diffuser (42.3878333, - 
70.785333) 
N04 Northeastern corner
of nearfield
(42.4438333, - 
70.7365) 
F13 ENE of Cohasset
Harbor, Mass Bay
south of outfall site
(42.2683333, -70.735) 
depth codes: 
A surface (within 2 m of
the surface) 
D subpycnocline 
Note: On July 27 and
August 25, the D-
depth samples were
collected
approximately 10-15
m from the bottom.
On July 29 and August
3 and 4, D-depth
samples were
approximately 2 m
from the bottom. 
4 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 12-Feb-16 13:35:41 2.04 3.41 1.55 8.018 0.172 
N18 12-Feb-16 13:35:41 7.95 1.51 7.929 0.171 
N18 12-Feb-16 13:35:41 12.88 3.5 1.72 7.899 0.171 
N18 12-Feb-16 13:35:41 12.88 3.18 1.58 7.926 0.174 
N18 12-Feb-16 13:35:41 18.48 1.51 7.911 0.169 
N18 12-Feb-16 13:35:41 26.95 3 1.38 7.83 0.18 
N18 23-Mar-16 10:02:44 1.88 1.14 1.51 5.275 0.125 
N18 23-Mar-16 10:02:44 6.87 1.93 5.067 0.133 
N18 23-Mar-16 10:02:44 11.56 0.96 2.87 5.33 0.14 
N18 23-Mar-16 10:02:44 11.56 0.89 2.54 5.51 0.14 
N18 23-Mar-16 10:02:44 17.59 3.99 5.638 0.152 
N18 23-Mar-16 10:02:44 23.43 0.41 3.34 5.672 0.148 
N18 18-Apr-16 09:48:26 2.12 3.53 0.55 3.087 0.173 
N18 18-Apr-16 09:48:26 9.43 5.64 2.87 4.297 0.213 
N18 18-Apr-16 09:48:26 9.43 5.74 2.95 4.256 0.224 
N18 18-Apr-16 09:48:26 15.03 1.19 4.163 0.177 
N18 18-Apr-16 09:48:26 21 1.19 4.576 0.194 
N18 18-Apr-16 09:48:26 25.81 2.36 1.4 5.052 0.208 
N18 18-May-16 09:33:20 1.7 2.13 0.0613 <0.025 0.0291 
N18 18-May-16 09:33:20 7.06 0.111 <0.025 0.0444 
N18 18-May-16 09:33:20 11.81 3.37 0.255 0.1285 0.0595 
N18 18-May-16 09:33:20 11.81 3.44 0.379 0.0092 0.0529 
N18 18-May-16 09:33:20 18.26 1.97 1.234 0.146 
N18 18-May-16 09:33:20 23.08 0.47 3.87 3.325 0.275 
N18 25-May-16 06:54:25 1.69 1.52 <0.028 <0.025 <0.013 
N18 25-May-16 06:54:25 10.28 2.18 <0.028 0.204 <0.013 
N18 25-May-16 06:54:25 10.28 2.18 <0.028 0.1414 0.0186 
N18 25-May-16 06:54:25 20.14 0.48 5.58 4.004 0.316 
N18 25-May-16 06:54:25 23.98 1 6.77 3.297 0.293 
N18 01-Jun-16 06:43:29 1.61 1.04 <0.028 <0.025 <0.013 
N18 01-Jun-16 06:43:29 9.95 <0.028 <0.025 <0.013 
N18 01-Jun-16 06:43:29 9.95 1.23 <0.028 <0.025 <0.013 
N18 01-Jun-16 06:43:29 19.02 1.79 1.81 0.3188 0.0532 
N18 01-Jun-16 06:43:29 21.89 1.73 0.384 0.797 0.106 
N18 21-Jun-16 10:03:23 2.08 0.342 <0.025 0.0134 
N18 21-Jun-16 10:03:23 8.71 0.256 <0.025 <0.013 
5 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 21-Jun-16 10:03:23 15.41 0.657 <0.025 0.0313 
N18 21-Jun-16 10:03:23 15.41 0.339 <0.025 <0.013 
N18 21-Jun-16 10:03:23 18.52 3.65 0.4603 0.0937 
N18 21-Jun-16 10:03:23 22.96 1.69 0.6727 0.0903 
N18 26-Jul-16 09:15:58 1.34 1.42 0.961 0.0074 0.0264 
N18 26-Jul-16 09:15:58 6.33 1.06 0.1869 0.0381 
N18 26-Jul-16 09:15:58 12.24 4.74 1.88 0.5002 0.0418 
N18 26-Jul-16 09:15:58 12.24 7 1.52 0.4685 0.0505 
N18 26-Jul-16 09:15:58 15.22 11.1 5.231 0.289 
N18 26-Jul-16 09:15:58 21.8 1.34 10.9 5.552 0.298 
N18 23-Aug-16 09:58:12 1.75 1.81 1.08 <0.025 <0.013 
N18 23-Aug-16 09:58:12 7.11 1.01 <0.025 <0.013 
N18 23-Aug-16 09:58:12 12.16 1.24 1.305 0.115 
N18 23-Aug-16 09:58:12 16.85 3.03 1.38 3.067 0.273 
N18 23-Aug-16 09:58:12 16.85 2.89 1.62 3.16 0.27 
N18 23-Aug-16 09:58:12 23 1.9 1.71 3.838 0.332 
N18 03-Oct-16 10:55:43 1.39 2.4 5.85 0.398 0.12 
N18 03-Oct-16 10:55:43 6.81 5.2 0.327 0.129 
N18 03-Oct-16 10:55:43 14 2.05 1.36 0.3418 0.0922 
N18 03-Oct-16 10:55:43 14 1.91 1.35 0.2815 0.0985 
N18 03-Oct-16 10:55:43 21.18 1.03 0.43 0.116 
N18 03-Oct-16 10:55:43 27.15 1.39 0.949 0.377 0.138 
N18 01-Nov-16 10:55:09 2.06 2.17 0.323 3.293 0.277 
N18 01-Nov-16 10:55:09 6.26 0.337 3.378 0.282 
N18 01-Nov-16 10:55:09 12.72 2.76 0.592 3.277 0.283 
N18 01-Nov-16 10:55:09 12.72 2.07 0.485 3.291 0.289 
N18 01-Nov-16 10:55:09 19.29 0.449 3.398 0.272 
N18 01-Nov-16 10:55:09 23.68 2.31 0.322 3.576 0.274 
N18 18-Feb-17 11:08:11 1.76 3.6 7.323 0.217 
N18 18-Feb-17 11:08:11 5.78 7.342 0.228 
N18 18-Feb-17 11:08:11 9.74 3.27 7.639 0.231 
N18 18-Feb-17 11:08:11 9.74 3.57 7.684 0.186 
N18 18-Feb-17 11:08:11 14.98 7.582 0.188 
N18 18-Feb-17 11:08:11 19.43 3.42 7.399 0.201 
N18 25-Mar-17 09:19:31 1.16 1.3 11.3 6.358 0.152 
N18 25-Mar-17 09:19:31 7.43 7.03 6.281 0.149 
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Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 25-Mar-17 09:19:31 12.98 1.42 4.94 6.197 0.153 
N18 25-Mar-17 09:19:31 12.98 1.42 4.42 6.394 0.146 
N18 25-Mar-17 09:19:31 19.56 2.02 6.422 0.148 
N18 25-Mar-17 09:19:31 26.08 1 1.49 6.381 0.149 
N18 24-Apr-17 10:38:53 1.7 2.01 0.262 0.1816 0.0204 
N18 24-Apr-17 10:38:53 7.12 3.07 1.509 0.081 
N18 24-Apr-17 10:38:53 14.37 3.74 7.81 4.24 0.18 
N18 24-Apr-17 10:38:53 14.37 3.43 7.82 4.302 0.188 
N18 24-Apr-17 10:38:53 20.83 7.93 6.206 0.224 
N18 24-Apr-17 10:38:53 25.82 4.37 7.61 6.269 0.221 
N18 16-May-17 10:14:36 1.52 1.95 0.201 0.3963 0.0367 
N18 16-May-17 10:14:36 6.33 0.336 0.358 0.028 
N18 16-May-17 10:14:36 12 1.71 0.654 0.6241 0.0429 
N18 16-May-17 10:14:36 12 1.85 0.614 0.4742 0.0398 
N18 16-May-17 10:14:36 17.84 0.96 0.8225 0.0625 
N18 16-May-17 10:14:36 26.07 0.91 1.66 1.6727 0.0873 
N18 13-Jun-17 09:41:19 1.52 1.21 0.281 <0.025 0.0231 
N18 13-Jun-17 09:41:19 7.43 0.339 0.0329 0.0153 
N18 13-Jun-17 09:41:19 13.4 1.51 1.56 1.821 0.109 
N18 13-Jun-17 09:41:19 13.4 1.7 1.81 1.883 0.117 
N18 13-Jun-17 09:41:19 20.1 2.54 3.008 0.202 
N18 13-Jun-17 09:41:19 26.07 0.96 2.63 2.897 0.203 
N18 21-Jun-17 12:38:37 1.82 2.11 0.165 0.109 <0.013 
N18 21-Jun-17 12:38:37 10.29 1.92 2.47 2.798 0.212 
N18 21-Jun-17 12:38:37 10.29 0.68 2.56 2.746 0.214 
N18 21-Jun-17 12:38:37 19.98 2.02 4.19 3.736 0.274 
N18 28-Jun-17 12:56:43 1.78 3.12 1.02 0.4817 0.0703 
N18 28-Jun-17 12:56:43 9.94 4.83 11.2 2.816 0.354 
N18 28-Jun-17 12:56:43 9.94 5.1 10.8 2.835 0.355 
N18 28-Jun-17 12:56:43 19.87 1.97 10.7 3.849 0.411 
N18 28-Jun-17 12:56:43 23.65 2.44 10.1 3.757 0.393 
N18 08-Jul-17 12:45:27 1.94 3.51 0.255 0.1194 0.0516 
N18 08-Jul-17 12:45:27 9.86 31.2 10.1 0.849 0.341 
N18 08-Jul-17 12:45:27 9.86 29.2 11.2 0.979 0.361 
N18 08-Jul-17 12:45:27 20.16 5.37 10.2 3.78 0.61 
N18 08-Jul-17 12:45:27 24.85 6.3 9.59 3.984 0.576 
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Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 16-Jul-17 12:31:54 1.7 0.94 0.232 0.0963 0.0297 
N18 16-Jul-17 12:31:54 9.86 3.44 5.79 0.593 0.208 
N18 16-Jul-17 12:31:54 9.86 3.73 5.75 0.67 0.143 
N18 16-Jul-17 12:31:54 21.14 4.87 5.1 1.731 0.279 
N18 26-Jul-17 09:55:36 1.76 1.66 <0.028 0.1025 0.0235 
N18 26-Jul-17 09:55:36 7.79 0.0749 0.0813 0.0173 
N18 26-Jul-17 09:55:36 13.7 0.115 0.0884 0.0206 
N18 26-Jul-17 09:55:36 19.61 9.3 2.58 0.2972 0.0808 
N18 26-Jul-17 09:55:36 19.61 9.22 2.68 0.3264 0.0796 
N18 26-Jul-17 09:55:36 26.8 2.11 5.32 1.021 0.239 
N18 23-Aug-17 09:53:12 1.72 1.64 <0.028 0.136 <0.013 
N18 23-Aug-17 09:53:12 6.23 2.44 0.8755 0.0845 
N18 23-Aug-17 09:53:12 10.31 2.86 9.29 2.554 0.276 
N18 23-Aug-17 09:53:12 10.31 3.02 9.23 2.557 0.253 
N18 23-Aug-17 09:53:12 17.07 7.53 3.961 0.369 
N18 23-Aug-17 09:53:12 23.77 0.87 4.74 4.07 0.37 
N18 06-Sep-17 09:20:37 1.64 5.23 <0.028 0.1298 0.0302 
N18 06-Sep-17 09:20:37 8.1 <0.028 0.2139 0.0361 
N18 06-Sep-17 09:20:37 13.83 7.3 2.23 1.175 0.105 
N18 06-Sep-17 09:20:37 13.83 7.38 2.23 1.194 0.126 
N18 06-Sep-17 09:20:37 20.34 3.43 3.788 0.292 
N18 06-Sep-17 09:20:37 24.49 1.75 2.6 4.595 0.325 
N18 01-Nov-17 09:34:50 1.51 4.85 <0.028 4.775 0.205 
N18 01-Nov-17 09:34:50 6.08 3.05 <0.028 5.795 0.155 
N18 01-Nov-17 09:34:50 6.08 3.48 <0.028 5.725 0.175 
N18 01-Nov-17 09:34:50 12.05 <0.028 6.6769 0.0931 
N18 01-Nov-17 09:34:50 17.96 <0.028 7.206 0.144 
N18 01-Nov-17 09:34:50 23.93 1.83 <0.028 7.24 0.12 
N18 06-Feb-18 10:57:52 1.87 1.54 1.82 8.707 0.053 
N18 06-Feb-18 10:57:52 7.23 1.79 8.5261 0.0539 
N18 06-Feb-18 10:57:52 13.75 1.44 1.67 8.5247 0.0553 
N18 06-Feb-18 10:57:52 13.75 1.46 1.75 8.6943 0.0557 
N18 06-Feb-18 10:57:52 18.44 1.29 8.4349 0.0451 
N18 06-Feb-18 10:57:52 23.93 1.1 0.816 8.1395 0.0405 
N18 20-Mar-18 10:00:55 1.52 0.58 5.21 8.141 0.189 
N18 20-Mar-18 10:00:55 7.73 3.92 8.176 0.174 
8 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 20-Mar-18 10:00:55 14.25 0.72 2.17 8.104 0.126 
N18 20-Mar-18 10:00:55 14.25 0.7 2.22 8.501 0.129 
N18 20-Mar-18 10:00:55 20.9 1.93 8.133 0.117 
N18 20-Mar-18 10:00:55 27.11 0.72 1.81 8.309 0.121 
N18 10-Apr-18 09:35:11 1.63 1.87 2.22 7.573 0.197 
N18 10-Apr-18 09:35:11 5.83 1.97 2.25 7.739 0.201 
N18 10-Apr-18 09:35:11 5.83 1.95 2.33 7.535 0.195 
N18 10-Apr-18 09:35:11 12.11 1.85 7.482 0.198 
N18 10-Apr-18 09:35:11 18.08 1.89 6.981 0.199 
N18 10-Apr-18 09:35:11 24.11 0.77 1.42 6.801 0.199 
N18 15-May-18 09:50:45 1.64 1.32 0.45 0.0533 <0.013 
N18 15-May-18 09:50:45 8.16 4.95 6.51 0.4101 0.0619 
N18 15-May-18 09:50:45 8.16 4.89 6.46 0.4062 0.0568 
N18 15-May-18 09:50:45 12.55 12.1 0.735 0.129 
N18 15-May-18 09:50:45 17.36 15 0.898 0.172 
N18 15-May-18 09:50:45 22.97 0.71 12.9 1.266 0.174 
N18 22-Jun-18 11:01:01 2 0.61 0.45 0.0602 <0.013 
N18 22-Jun-18 11:01:01 7.3 1.14 0.227 <0.013 
N18 22-Jun-18 11:01:01 13.88 4.66 6.68 0.813 0.116 
N18 22-Jun-18 11:01:01 13.88 4.67 6.17 0.81 0.111 
N18 22-Jun-18 11:01:01 18.7 12.9 2.274 0.246 
N18 22-Jun-18 11:01:01 25.1 0.86 8.23 3.519 0.301 
N18 24-Jul-18 10:33:31 2.73 2.02 <0.028 0.0865 0.0915 
N18 24-Jul-18 10:33:31 6.2 <0.028 0 0.107 
N18 24-Jul-18 10:33:31 12.48 5.71 <0.028 0.1515 0.0645 
N18 24-Jul-18 10:33:31 12.48 4.92 <0.028 0.0592 0.0508 
N18 24-Jul-18 10:33:31 19.91 9.64 1.035 0.215 
N18 24-Jul-18 10:33:31 26.31 0.51 0.777 1.288 0.212 
N18 21-Aug-18 10:11:45 2.25 2.83 <0.028 0.039 0.0174 
N18 21-Aug-18 10:11:45 6.57 0.0621 0.0374 0.0181 
N18 21-Aug-18 10:11:45 11.02 2.92 0.0705 0.0346 <0.013 
N18 21-Aug-18 10:11:45 11.02 2.45 0.0625 0.0443 <0.013 
N18 21-Aug-18 10:11:45 16.99 0.0646 0.0579 <0.013 
N18 21-Aug-18 10:11:45 23.69 1.16 0.235 1.661 0.229 
N18 05-Sep-18 10:26:44 1.95 2.28 0.354 <0.025 <0.013 
N18 05-Sep-18 10:26:44 7.86 5.43 4.54 1.875 0.285 
9 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 05-Sep-18 10:26:44 7.86 5.04 4.43 1.902 0.288 
N18 05-Sep-18 10:26:44 13.28 24.2 5.778 0.722 
N18 05-Sep-18 10:26:44 18.03 10.7 6.377 0.713 
N18 05-Sep-18 10:26:44 23.39 0.75 8.28 6.757 0.693 
N18 23-Oct-18 10:55:43 2.03 5.53 0.515 1.062 0.128 
N18 23-Oct-18 10:55:43 7.64 0.284 1.059 0.131 
N18 23-Oct-18 10:55:43 12.82 5.14 0.471 1.164 0.136 
N18 23-Oct-18 10:55:43 12.82 4.97 0.439 1.147 0.133 
N18 23-Oct-18 10:55:43 17.63 0.341 1.159 0.131 
N18 23-Oct-18 10:55:43 23.72 1.39 0.496 4.236 0.214 
N18 05-Feb-19 10:42:07 1.38 2.26 2.04 5.56 0.22 
N18 05-Feb-19 10:42:07 7.65 2.35 2.12 5.612 0.178 
N18 05-Feb-19 10:42:07 7.65 3.03 2.01 5.453 0.187 
N18 05-Feb-19 10:42:07 13.62 0.685 5.678 0.172 
N18 05-Feb-19 10:42:07 19.41 0.408 5.807 0.173 
N18 05-Feb-19 10:42:07 23.98 3.95 0.322 6.2 0.15 
N18 20-Mar-19 09:51:03 1.41 0.32 7.14 6.731 0.219 
N18 20-Mar-19 09:51:03 8.12 4.18 6.759 0.171 
N18 20-Mar-19 09:51:03 13.48 0.34 1.47 6.717 0.123 
N18 20-Mar-19 09:51:03 13.48 0.38 1.66 6.94 0.13 
N18 20-Mar-19 09:51:03 18.72 0.308 6.752 0.118 
N18 20-Mar-19 09:51:03 22.98 0.3 0.679 6.947 0.123 
N18 11-Apr-19 12:30:25 1.58 4.24 0.651 0.7707 0.0823 
N18 11-Apr-19 12:30:25 6.09 2.02 0.6203 0.0997 
N18 11-Apr-19 12:30:25 9.56 6.82 3.61 0.668 0.162 
N18 11-Apr-19 12:30:25 9.56 5.75 3.72 0.7 0.288 
N18 11-Apr-19 12:30:25 17.12 3.06 0.46 0.122 
N18 11-Apr-19 12:30:25 22.9 5.14 2.35 0.481 0.131 
N18 16-May-19 10:48:21 1.89 2.37 0.437 0.2154 0.0166 
N18 16-May-19 10:48:21 6.21 0.842 0.1335 0.0235 
N18 16-May-19 10:48:21 9.2 3.51 0.519 0.1782 0.0218 
N18 16-May-19 10:48:21 9.2 3.68 0.551 0.1244 0.0236 
N18 16-May-19 10:48:21 16.87 10.8 1.978 0.182 
N18 16-May-19 10:48:21 24.37 0.38 12.8 3.339 0.291 
N18 22-May-19 08:08:45 2.07 0.55 0.626 0.09 0.11 
N18 22-May-19 08:08:45 10.72 1.56 2.19 1.414 0.166 
10 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 22-May-19 08:08:45 10.72 0.76 2.14 1.408 0.122 
N18 22-May-19 08:08:45 20.83 1.49 3.62 4.246 0.294 
N18 22-May-19 08:08:45 26.74 0.81 3.11 4.82 0.29 
N18 30-May-19 14:36:31 1.89 4.91 0.225 0.1427 0.0693 
N18 30-May-19 14:36:31 10.6 8.19 3.16 0.948 0.122 
N18 30-May-19 14:36:31 10.6 6.19 3.07 0.9548 0.0852 
N18 30-May-19 14:36:31 20.29 5.66 19.8 4.6 0.31 
N18 06-Jun-19 10:45:38 2.01 1.67 0.368 0.0498 <0.013 
N18 06-Jun-19 10:45:38 5.84 0.47 0.054 <0.013 
N18 06-Jun-19 10:45:38 9.8 1.56 1.09 0.218 <0.013 
N18 06-Jun-19 10:45:38 9.8 1.17 0.599 0.185 <0.013 
N18 06-Jun-19 10:45:38 17.54 2.95 2.17 0.1 
N18 06-Jun-19 10:45:38 25.1 1.99 6.03 4.448 0.202 
N18 12-Jun-19 06:45:37 1.77 1.28 0.785 0.0664 <0.013 
N18 12-Jun-19 06:45:37 9.99 1.41 5.84 1.1028 0.0772 
N18 12-Jun-19 06:45:37 9.99 0.75 5.93 1.1406 0.0794 
N18 12-Jun-19 06:45:37 20.04 0.22 10.2 4.477 0.243 
N18 12-Jun-19 06:45:37 23.64 0.49 10.2 4.67 0.23 
N18 19-Jun-19 06:58:49 1.77 4.42 0.694 0.0871 0.0289 
N18 19-Jun-19 06:58:49 9.93 7.08 2.34 0.9165 0.0675 
N18 19-Jun-19 06:58:49 9.93 6.77 2.21 0.8768 0.0612 
N18 19-Jun-19 06:58:49 19.62 0.39 10.3 4.568 0.242 
N18 19-Jun-19 06:58:49 23.76 0.36 9.96 4.785 0.225 
N18 27-Jun-19 06:56:28 2.19 1.25 0.661 0.1054 0.0196 
N18 27-Jun-19 06:56:28 9.87 3.73 7.03 2.073 0.147 
N18 27-Jun-19 06:56:28 9.87 2.88 6.81 2.131 0.139 
N18 27-Jun-19 06:56:28 22.54 0.66 8.43 4.801 0.249 
N18 10-Jul-19 06:48:12 1.83 3.25 0.164 <0.025 0.099 
N18 10-Jul-19 06:48:12 10.11 3.53 1.8 0.84 0.139 
N18 10-Jul-19 06:48:12 10.11 3.58 1.82 0.865 0.155 
N18 10-Jul-19 06:48:12 20.17 0.69 4.19 2.631 0.229 
N18 10-Jul-19 06:48:12 23.52 0.65 4.61 2.693 0.237 
N18 17-Jul-19 10:11:44 1.78 1.23 <0.028 0.0556 0.0308 
N18 17-Jul-19 10:11:44 6.1 5.29 <0.028 0.3567 0.0653 
N18 17-Jul-19 10:11:44 6.1 7.1 <0.028 0.3708 0.0572 
N18 17-Jul-19 10:11:44 12.81 6.48 3.728 0.262 
11 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 17-Jul-19 10:11:44 17.5 13.9 5.027 0.343 
N18 17-Jul-19 10:11:44 22.19 0.51 8.05 4.839 0.301 
N18 31-Jul-19 06:50:49 1.76 1.45 <0.028 0.1463 0.0387 
N18 31-Jul-19 06:50:49 9.62 1.98 <0.028 0.2774 0.0476 
N18 31-Jul-19 06:50:49 9.62 1.83 0.0378 0.2784 0.0526 
N18 31-Jul-19 06:50:49 21.68 1.16 0.783 1.61 0.14 
N18 21-Aug-19 09:52:57 1.62 2.52 <0.028 0.0664 0.0223 
N18 21-Aug-19 09:52:57 6.5 4.27 <0.028 0.0817 0.0283 
N18 21-Aug-19 09:52:57 6.5 4.63 <0.028 0.0791 0.0148 
N18 21-Aug-19 09:52:57 11.43 7.65 1.552 0.238 
N18 21-Aug-19 09:52:57 17.28 9.2 2.448 0.342 
N18 21-Aug-19 09:52:57 22.22 0.74 7.62 2.178 0.322 
N18 04-Sep-19 08:53:19 2.13 8.24 0.417 0.0394 <0.013 
N18 04-Sep-19 08:53:19 7.06 0.426 0.0275 <0.013 
N18 04-Sep-19 08:53:19 13.28 4.37 0.857 0.0947 <0.013 
N18 04-Sep-19 08:53:19 13.28 4.39 0.605 0.0449 <0.013 
N18 04-Sep-19 08:53:19 16.51 2.39 0.664 0.1 
N18 04-Sep-19 08:53:19 21.32 9.24 0.767 0.2125 0.0245 
N18 30-Oct-19 09:29:21 1.83 4.78 4.83 1.822 0.408 
N18 30-Oct-19 09:29:21 5.67 3.35 3.83 1.792 0.368 
N18 30-Oct-19 09:29:21 5.67 3.36 3.96 1.795 0.375 
N18 30-Oct-19 09:29:21 12.86 2.4 1.884 0.366 
N18 30-Oct-19 09:29:21 18.58 1.52 1.733 0.337 
N18 30-Oct-19 09:29:21 22.54 2.01 1.36 1.82 0.34 
N18 11-Feb-20 10:32:55 2.48 0.76 6.82 8.423 0.227 
N18 11-Feb-20 10:32:55 8.81 5.12 8.929 0.221 
N18 11-Feb-20 10:32:55 15.45 0.4 2.64 8.92 0.21 
N18 11-Feb-20 10:32:55 15.45 0.48 2.78 8.708 0.202 
N18 11-Feb-20 10:32:55 21.24 2.2 9.095 0.205 
N18 11-Feb-20 10:32:55 26.97 0.39 2.17 8.891 0.209 
N18 04-May-20 09:39:16 1.77 1.17 0.116 0.0371 <0.013 
N18 04-May-20 09:39:16 7.61 <0.028 <0.025 <0.013 
N18 04-May-20 09:39:16 13.52 <0.028 0.0828 <0.013 
N18 04-May-20 09:39:16 19.19 2.27 0.32 0.4601 0.0399 
N18 04-May-20 09:39:16 19.19 2.32 0.154 0.265 0.258 
N18 04-May-20 09:39:16 24.55 3.45 0.147 0.6705 0.0455 
12 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 18-May-20 09:16:28 1.82 1.38 <0.028 0.0318 <0.013 
N18 18-May-20 09:16:28 8.16 <0.028 <0.025 <0.013 
N18 18-May-20 09:16:28 14.13 0.87 0.0753 0.0457 <0.013 
N18 18-May-20 09:16:28 14.13 1.2 0.05 <0.025 <0.013 
N18 18-May-20 09:16:28 19.3 <0.028 0.0547 <0.013 
N18 18-May-20 09:16:28 25.46 0.32 0.452 0.7767 0.0793 
N18 16-Jun-20 09:16:50 1.88 0.63 0.319 <0.025 <0.013 
N18 16-Jun-20 09:16:50 9.56 0.389 0.0802 <0.013 
N18 16-Jun-20 09:16:50 16.99 2.68 5.97 1.008 0.112 
N18 16-Jun-20 09:16:50 16.99 3.33 5.85 1.149 0.111 
N18 16-Jun-20 09:16:50 19.49 8.91 1.977 0.183 
N18 16-Jun-20 09:16:50 24.91 1.46 7.31 3.181 0.259 
N18 25-Jun-20 13:01:20 1.87 0.8 0.165 <0.025 0.0161 
N18 25-Jun-20 13:01:20 10.16 1.31 10.2 1.999 0.201 
N18 25-Jun-20 13:01:20 10.16 1.97 10.4 2.231 0.209 
N18 25-Jun-20 13:01:20 19.66 0.24 5.52 2.473 0.177 
N18 25-Jun-20 13:01:20 25.51 0.27 6.45 2.441 0.199 
N18 09-Jul-20 13:16:54 1.62 0.98 0.422 <0.025 <0.013 
N18 09-Jul-20 13:16:54 10.02 1.07 0.439 <0.025 <0.013 
N18 09-Jul-20 13:16:54 10.02 1.09 0.394 0.0396 <0.013 
N18 09-Jul-20 13:16:54 19.89 0.26 2.04 0.5949 0.0891 
N18 09-Jul-20 13:16:54 25.99 0.48 1.85 0.6 0.114 
N18 14-Jul-20 09:29:28 1.78 0.21 0.0975 0.0766 <0.013 
N18 14-Jul-20 09:29:28 5.31 0.115 0.0759 <0.013 
N18 14-Jul-20 09:29:28 9.27 0.57 1 0.712 0.112 
N18 14-Jul-20 09:29:28 9.27 0.54 0.742 0.6681 0.0809 
N18 14-Jul-20 09:29:28 15.79 1.27 2.122 0.188 
N18 14-Jul-20 09:29:28 24.63 <0.1 1.23 2.268 0.192 
N18 19-Aug-20 09:05:20 1.39 0.33 0.0525 0.0193 0.0206 
N18 19-Aug-20 09:05:20 9.07 0.134 <0.025 0.0232 
N18 19-Aug-20 09:05:20 13.94 <0.028 0.081 <0.013 
N18 19-Aug-20 09:05:20 19.73 2.7 1.66 0.422 0.082 
N18 19-Aug-20 09:05:20 19.73 2.41 1.71 0.392 0.117 
N18 19-Aug-20 09:05:20 25.94 1.15 3.33 0.988 <0.013 
N18 02-Sep-20 09:04:54 2.15 4.17 <0.028 0.0328 <0.013 
N18 02-Sep-20 09:04:54 6.97 <0.028 0.0322 <0.013 
13 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Minimum 1.16 0.21 0.0378 0 0.0134 
Maximum 27.15 31.2 24.2 9.095 0.722 
Median 12.24 2.02 1.82 1.6727 0.148 
N18 02-Sep-20 09:04:54 15.01 7.5 0.173 0.0715 0.0136 
N18 02-Sep-20 09:04:54 15.01 4.41 0.278 0.0914 0.0136 
N18 02-Sep-20 09:04:54 18.97 11 1.428 0.242 
N18 02-Sep-20 09:04:54 23.6 3.17 9.47 1.203 0.207 
N18 20-Oct-20 09:05:21 1.67 5.68 0.603 1.159 0.111 
N18 20-Oct-20 09:05:21 7.77 0.56 0.3537 0.0343 
N18 20-Oct-20 09:05:21 13.61 4.28 0.773 0.7032 0.0628 
N18 20-Oct-20 09:05:21 13.61 5.36 0.807 0.7252 0.0628 
N18 20-Oct-20 09:05:21 19.04 1.15 2.021 0.149 
N18 20-Oct-20 09:05:21 24.46 2.72 1.42 3.143 0.217 
14 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 12-Feb-16 13:35:41 2.04 18.18 9.99 
N18 12-Feb-16 13:35:41 7.95 18.16 10.06 
N18 12-Feb-16 13:35:41 12.88 18.33 10.26 
N18 12-Feb-16 13:35:41 12.88 18.48 10.38 
N18 12-Feb-16 13:35:41 18.48 19.15 11.07 
N18 12-Feb-16 13:35:41 26.95 17.64 9.63 
N18 23-Mar-16 10:02:44 1.88 14.17 8.77 
N18 23-Mar-16 10:02:44 6.87 14.75 9.55 
N18 23-Mar-16 10:02:44 11.56 15.67 10.2 
N18 23-Mar-16 10:02:44 11.56 15.08 9.43 
N18 23-Mar-16 10:02:44 17.59 20.23 14.44 
N18 23-Mar-16 10:02:44 23.43 16.85 11.03 
N18 18-Apr-16 09:48:26 2.12 14.5425 11.2825 
N18 18-Apr-16 09:48:26 9.43 18.8325 14.3225 
N18 18-Apr-16 09:48:26 9.43 19.7525 15.2725 
N18 18-Apr-16 09:48:26 15.03 16.3625 12.0225 
N18 18-Apr-16 09:48:26 21 
N18 18-Apr-16 09:48:26 25.81 
N18 18-May-16 09:33:20 1.7 11.52 11.4659 
N18 18-May-16 09:33:20 7.06 12.09 12.0206 
N18 18-May-16 09:33:20 11.81 11.18 10.992 
N18 18-May-16 09:33:20 11.81 10.47 10.4079 
N18 18-May-16 09:33:20 18.26 12.78 11.4 
N18 18-May-16 09:33:20 23.08 16.61 13.01 
N18 25-May-16 06:54:25 1.69 
N18 25-May-16 06:54:25 10.28 
N18 25-May-16 06:54:25 10.28 
N18 25-May-16 06:54:25 20.14 
N18 25-May-16 06:54:25 23.98 
N18 01-Jun-16 06:43:29 1.61 
N18 01-Jun-16 06:43:29 9.95 
N18 01-Jun-16 06:43:29 9.95 
N18 01-Jun-16 06:43:29 19.02 
N18 01-Jun-16 06:43:29 21.89 
N18 21-Jun-16 10:03:23 2.08 9.8 9.7616 
N18 21-Jun-16 10:03:23 8.71 10.58 10.542 
15 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 21-Jun-16 10:03:23 15.41 11.17 11.1137 
N18 21-Jun-16 10:03:23 15.41 11.76 11.722 
N18 21-Jun-16 10:03:23 18.52 11.09 10.536 
N18 21-Jun-16 10:03:23 22.96 10.76 9.997 
N18 26-Jul-16 09:15:58 1.34 9.7165 9.6827 
N18 26-Jul-16 09:15:58 6.33 12.1765 11.9515 
N18 26-Jul-16 09:15:58 12.24 15.5265 14.9845 
N18 26-Jul-16 09:15:58 12.24 15.0465 14.5275 
N18 26-Jul-16 09:15:58 15.22 25.4165 19.8965 
N18 26-Jul-16 09:15:58 21.8 23.2875 17.4375 
N18 23-Aug-16 09:58:12 1.75 9.73 9.692 
N18 23-Aug-16 09:58:12 7.11 9.57 9.532 
N18 23-Aug-16 09:58:12 12.16 11.87 10.45 
N18 23-Aug-16 09:58:12 16.85 12.53 9.19 
N18 23-Aug-16 09:58:12 16.85 13.45 10.02 
N18 23-Aug-16 09:58:12 23 12.99 8.82 
N18 03-Oct-16 10:55:43 1.39 
N18 03-Oct-16 10:55:43 6.81 
N18 03-Oct-16 10:55:43 14 
N18 03-Oct-16 10:55:43 14 
N18 03-Oct-16 10:55:43 21.18 
N18 03-Oct-16 10:55:43 27.15 
N18 01-Nov-16 10:55:09 2.06 17.5 13.93 
N18 01-Nov-16 10:55:09 6.26 
N18 01-Nov-16 10:55:09 12.72 
N18 01-Nov-16 10:55:09 12.72 15.34 11.76 
N18 01-Nov-16 10:55:09 19.29 18.5 14.83 
N18 01-Nov-16 10:55:09 23.68 16.17 12.32 
N18 18-Feb-17 11:08:11 1.76 22.9 15.36 
N18 18-Feb-17 11:08:11 5.78 24.18 16.61 
N18 18-Feb-17 11:08:11 9.74 18.7 10.83 
N18 18-Feb-17 11:08:11 9.74 18.84 10.97 
N18 18-Feb-17 11:08:11 14.98 17.6 9.83 
N18 18-Feb-17 11:08:11 19.43 17.52 9.92 
N18 25-Mar-17 09:19:31 1.16 24 17.49 
N18 25-Mar-17 09:19:31 7.43 21.71 15.28 
16 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 25-Mar-17 09:19:31 12.98 17.38 11.03 
N18 25-Mar-17 09:19:31 12.98 16.534 9.994 
N18 25-Mar-17 09:19:31 19.56 14.53 7.96 
N18 25-Mar-17 09:19:31 26.08 13.9 7.37 
N18 24-Apr-17 10:38:53 1.7 9.21 9.008 
N18 24-Apr-17 10:38:53 7.12 13.44 11.85 
N18 24-Apr-17 10:38:53 14.37 21.43 17.01 
N18 24-Apr-17 10:38:53 14.37 20.99 16.5 
N18 24-Apr-17 10:38:53 20.83 21.43 15 
N18 24-Apr-17 10:38:53 25.82 21.17 14.68 
N18 16-May-17 10:14:36 1.52 9.94 9.507 
N18 16-May-17 10:14:36 6.33 11.14 10.754 
N18 16-May-17 10:14:36 12 9.59 8.923 
N18 16-May-17 10:14:36 12 11.13 10.616 
N18 16-May-17 10:14:36 17.84 9.66 8.775 
N18 16-May-17 10:14:36 26.07 10.42 8.66 
N18 13-Jun-17 09:41:19 1.52 9.97 9.9219 
N18 13-Jun-17 09:41:19 7.43 8.74 8.6918 
N18 13-Jun-17 09:41:19 13.4 10.3 8.37 
N18 13-Jun-17 09:41:19 13.4 10.74 8.74 
N18 13-Jun-17 09:41:19 20.1 11.51 8.3 
N18 13-Jun-17 09:41:19 26.07 11.98 8.88 
N18 21-Jun-17 12:38:37 1.82 
N18 21-Jun-17 12:38:37 10.29 
N18 21-Jun-17 12:38:37 10.29 
N18 21-Jun-17 12:38:37 19.98 
N18 28-Jun-17 12:56:43 1.78 
N18 28-Jun-17 12:56:43 9.94 
N18 28-Jun-17 12:56:43 9.94 
N18 28-Jun-17 12:56:43 19.87 
N18 28-Jun-17 12:56:43 23.65 
N18 08-Jul-17 12:45:27 1.94 
N18 08-Jul-17 12:45:27 9.86 
N18 08-Jul-17 12:45:27 9.86 
N18 08-Jul-17 12:45:27 20.16 
N18 08-Jul-17 12:45:27 24.85 
17 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 16-Jul-17 12:31:54 1.7 
N18 16-Jul-17 12:31:54 9.86 
N18 16-Jul-17 12:31:54 9.86 
N18 16-Jul-17 12:31:54 21.14 
N18 26-Jul-17 09:55:36 1.76 10.12 9.994 
N18 26-Jul-17 09:55:36 7.79 10.04 9.9414 
N18 26-Jul-17 09:55:36 13.7 7.26 7.151 
N18 26-Jul-17 09:55:36 19.61 17.59 17.212 
N18 26-Jul-17 09:55:36 19.61 18.07 17.664 
N18 26-Jul-17 09:55:36 26.8 18.02 16.76 
N18 23-Aug-17 09:53:12 1.72 10.08 9.931 
N18 23-Aug-17 09:53:12 6.23 14.85 13.89 
N18 23-Aug-17 09:53:12 10.31 21.38 18.55 
N18 23-Aug-17 09:53:12 10.31 22.34 19.53 
N18 23-Aug-17 09:53:12 17.07 18.51 14.18 
N18 23-Aug-17 09:53:12 23.77 16.83 12.39 
N18 06-Sep-17 09:20:37 1.64 12.59 12.43 
N18 06-Sep-17 09:20:37 8.1 12.01 11.76 
N18 06-Sep-17 09:20:37 13.83 14.97 13.69 
N18 06-Sep-17 09:20:37 13.83 16.15 14.83 
N18 06-Sep-17 09:20:37 20.34 16.33 12.25 
N18 06-Sep-17 09:20:37 24.49 15.53 10.61 
N18 01-Nov-17 09:34:50 1.51 15.02 10.04 
N18 01-Nov-17 09:34:50 6.08 14.44 8.49 
N18 01-Nov-17 09:34:50 6.08 14.22 8.32 
N18 01-Nov-17 09:34:50 12.05 15.19 8.42 
N18 01-Nov-17 09:34:50 17.96 16.11 8.76 
N18 01-Nov-17 09:34:50 23.93 16.3 8.94 
N18 06-Feb-18 10:57:52 1.87 20.58 11.82 
N18 06-Feb-18 10:57:52 7.23 17.54 8.96 
N18 06-Feb-18 10:57:52 13.75 18.22 9.64 
N18 06-Feb-18 10:57:52 13.75 19.22 10.47 
N18 06-Feb-18 10:57:52 18.44 18.9 10.42 
N18 06-Feb-18 10:57:52 23.93 16.98 8.8 
N18 20-Mar-18 10:00:55 1.52 22.21 13.88 
N18 20-Mar-18 10:00:55 7.73 20.41 12.06 
18 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 20-Mar-18 10:00:55 14.25 18.96 10.73 
N18 20-Mar-18 10:00:55 14.25 19.39 10.76 
N18 20-Mar-18 10:00:55 20.9 18.46 10.21 
N18 20-Mar-18 10:00:55 27.11 17.61 9.18 
N18 10-Apr-18 09:35:11 1.63 19.44 11.67 
N18 10-Apr-18 09:35:11 5.83 19.35 11.41 
N18 10-Apr-18 09:35:11 5.83 18.99 11.26 
N18 10-Apr-18 09:35:11 12.11 17.942 10.262 
N18 10-Apr-18 09:35:11 18.08 16.842 9.662 
N18 10-Apr-18 09:35:11 24.11 15.142 8.142 
N18 15-May-18 09:50:45 1.64 10.56 10.4937 
N18 15-May-18 09:50:45 8.16 21.13 20.658 
N18 15-May-18 09:50:45 8.16 19.83 19.367 
N18 15-May-18 09:50:45 12.55 24.67 23.806 
N18 15-May-18 09:50:45 17.36 27.23 26.16 
N18 15-May-18 09:50:45 22.97 24.64 23.2 
N18 22-Jun-18 11:01:01 2 10.49 10.4168 
N18 22-Jun-18 11:01:01 7.3 11.77 11.53 
N18 22-Jun-18 11:01:01 13.88 21.86 20.931 
N18 22-Jun-18 11:01:01 13.88 
N18 22-Jun-18 11:01:01 18.7 26.89 24.37 
N18 22-Jun-18 11:01:01 25.1 22.74 18.92 
N18 24-Jul-18 10:33:31 2.73 13.7405 13.5625 
N18 24-Jul-18 10:33:31 6.2 14.5105 14.4035 
N18 24-Jul-18 10:33:31 12.48 19.0205 18.8045 
N18 24-Jul-18 10:33:31 12.48 20.3705 20.2605 
N18 24-Jul-18 10:33:31 19.91 24.1405 22.8905 
N18 24-Jul-18 10:33:31 26.31 13.4005 11.9005 
N18 21-Aug-18 10:11:45 2.25 12.63 12.5736 
N18 21-Aug-18 10:11:45 6.57 10.29 10.2345 
N18 21-Aug-18 10:11:45 11.02 13.14 13.0924 
N18 21-Aug-18 10:11:45 11.02 14.3 14.2427 
N18 21-Aug-18 10:11:45 16.99 12.16 12.0891 
N18 21-Aug-18 10:11:45 23.69 13.29 11.4 
N18 05-Sep-18 10:26:44 1.95 12.95 12.912 
N18 05-Sep-18 10:26:44 7.86 18.85 16.69 
19 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 05-Sep-18 10:26:44 7.86 18.64 16.45 
N18 05-Sep-18 10:26:44 13.28 39.83 33.33 
N18 05-Sep-18 10:26:44 18.03 27.29 20.2 
N18 05-Sep-18 10:26:44 23.39 24.76 17.31 
N18 23-Oct-18 10:55:43 2.03 12.14 10.95 
N18 23-Oct-18 10:55:43 7.64 12.61 11.42 
N18 23-Oct-18 10:55:43 12.82 13.19 11.89 
N18 23-Oct-18 10:55:43 12.82 13.74 12.46 
N18 23-Oct-18 10:55:43 17.63 12.15 10.86 
N18 23-Oct-18 10:55:43 23.72 12.88 8.43 
N18 05-Feb-19 10:42:07 1.38 
N18 05-Feb-19 10:42:07 7.65 
N18 05-Feb-19 10:42:07 7.65 
N18 05-Feb-19 10:42:07 13.62 
N18 05-Feb-19 10:42:07 19.41 
N18 05-Feb-19 10:42:07 23.98 
N18 20-Mar-19 09:51:03 1.41 24.85 17.9 
N18 20-Mar-19 09:51:03 8.12 21.12 14.19 
N18 20-Mar-19 09:51:03 13.48 18.32 11.48 
N18 20-Mar-19 09:51:03 13.48 18.01 10.94 
N18 20-Mar-19 09:51:03 18.72 14.844 7.974 
N18 20-Mar-19 09:51:03 22.98 17.425 10.355 
N18 11-Apr-19 12:30:25 1.58 10.16 9.307 
N18 11-Apr-19 12:30:25 6.09 11.85 11.13 
N18 11-Apr-19 12:30:25 9.56 13.86 13.03 
N18 11-Apr-19 12:30:25 9.56 15.53 14.542 
N18 11-Apr-19 12:30:25 17.12 12.56 11.978 
N18 11-Apr-19 12:30:25 22.9 12.85 12.238 
N18 16-May-19 10:48:21 1.89 9.2 8.968 
N18 16-May-19 10:48:21 6.21 11.49 11.333 
N18 16-May-19 10:48:21 9.2 11.45 11.25 
N18 16-May-19 10:48:21 9.2 11.56 11.412 
N18 16-May-19 10:48:21 16.87 18.66 16.5 
N18 16-May-19 10:48:21 24.37 24.81 21.18 
N18 22-May-19 08:08:45 2.07 
N18 22-May-19 08:08:45 10.72 
20 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 22-May-19 08:08:45 10.72 
N18 22-May-19 08:08:45 20.83 
N18 22-May-19 08:08:45 26.74 
N18 30-May-19 14:36:31 1.89 
N18 30-May-19 14:36:31 10.6 
N18 30-May-19 14:36:31 10.6 
N18 30-May-19 14:36:31 20.29 
N18 06-Jun-19 10:45:38 2.01 10.55 10.4872 
N18 06-Jun-19 10:45:38 5.84 10.55 10.483 
N18 06-Jun-19 10:45:38 9.8 9.7 9.469 
N18 06-Jun-19 10:45:38 9.8 9.96 9.762 
N18 06-Jun-19 10:45:38 17.54 12.81 10.54 
N18 06-Jun-19 10:45:38 25.1 18.37 13.72 
N18 12-Jun-19 06:45:37 1.77 
N18 12-Jun-19 06:45:37 9.99 
N18 12-Jun-19 06:45:37 9.99 
N18 12-Jun-19 06:45:37 20.04 
N18 12-Jun-19 06:45:37 23.64 
N18 19-Jun-19 06:58:49 1.77 
N18 19-Jun-19 06:58:49 9.93 
N18 19-Jun-19 06:58:49 9.93 
N18 19-Jun-19 06:58:49 19.62 
N18 19-Jun-19 06:58:49 23.76 
N18 27-Jun-19 06:56:28 2.19 
N18 27-Jun-19 06:56:28 9.87 
N18 27-Jun-19 06:56:28 9.87 
N18 27-Jun-19 06:56:28 22.54 
N18 10-Jul-19 06:48:12 1.83 
N18 10-Jul-19 06:48:12 10.11 
N18 10-Jul-19 06:48:12 10.11 
N18 10-Jul-19 06:48:12 20.17 
N18 10-Jul-19 06:48:12 23.52 
N18 17-Jul-19 10:11:44 1.78 14.91 14.8236 
N18 17-Jul-19 10:11:44 6.1 18.86 18.438 
N18 17-Jul-19 10:11:44 6.1 20.8 20.372 
N18 17-Jul-19 10:11:44 12.81 21.34 17.35 
21 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 17-Jul-19 10:11:44 17.5 31.13 25.76 
N18 17-Jul-19 10:11:44 22.19 25.68 20.54 
N18 31-Jul-19 06:50:49 1.76 
N18 31-Jul-19 06:50:49 9.62 
N18 31-Jul-19 06:50:49 9.62 
N18 31-Jul-19 06:50:49 21.68 
N18 21-Aug-19 09:52:57 1.62 10.65 10.5613 
N18 21-Aug-19 09:52:57 6.5 11.48 11.37 
N18 21-Aug-19 09:52:57 6.5 
N18 21-Aug-19 09:52:57 11.43 22.34 20.55 
N18 21-Aug-19 09:52:57 17.28 22.85 20.06 
N18 21-Aug-19 09:52:57 22.22 21.91 19.41 
N18 04-Sep-19 08:53:19 2.13 12.52 12.4676 
N18 04-Sep-19 08:53:19 7.06 13.23 13.1895 
N18 04-Sep-19 08:53:19 13.28 12.69 12.5823 
N18 04-Sep-19 08:53:19 13.28 11 10.9421 
N18 04-Sep-19 08:53:19 16.51 14.82 14.056 
N18 04-Sep-19 08:53:19 21.32 13.5 13.263 
N18 30-Oct-19 09:29:21 1.83 20.43 18.2 
N18 30-Oct-19 09:29:21 5.67 17.97 15.81 
N18 30-Oct-19 09:29:21 5.67 19.31 17.14 
N18 30-Oct-19 09:29:21 12.86 15.74 13.49 
N18 30-Oct-19 09:29:21 18.58 14.09 12.02 
N18 30-Oct-19 09:29:21 22.54 13.68 11.52 
N18 11-Feb-20 10:32:55 2.48 22.83 14.18 
N18 11-Feb-20 10:32:55 8.81 23.09 13.94 
N18 11-Feb-20 10:32:55 15.45 18.701 9.571 
N18 11-Feb-20 10:32:55 15.45 18.606 9.696 
N18 11-Feb-20 10:32:55 21.24 17.558 8.258 
N18 11-Feb-20 10:32:55 26.97 18.464 9.364 
N18 04-May-20 09:39:16 1.77 
N18 04-May-20 09:39:16 7.61 
N18 04-May-20 09:39:16 13.52 
N18 04-May-20 09:39:16 19.19 
N18 04-May-20 09:39:16 19.19 
N18 04-May-20 09:39:16 24.55 
22 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 18-May-20 09:16:28 1.82 
N18 18-May-20 09:16:28 8.16 
N18 18-May-20 09:16:28 14.13 
N18 18-May-20 09:16:28 14.13 
N18 18-May-20 09:16:28 19.3 
N18 18-May-20 09:16:28 25.46 
N18 16-Jun-20 09:16:50 1.88 
N18 16-Jun-20 09:16:50 9.56 
N18 16-Jun-20 09:16:50 16.99 
N18 16-Jun-20 09:16:50 16.99 
N18 16-Jun-20 09:16:50 19.49 
N18 16-Jun-20 09:16:50 24.91 
N18 25-Jun-20 13:01:20 1.87 
N18 25-Jun-20 13:01:20 10.16 
N18 25-Jun-20 13:01:20 10.16 
N18 25-Jun-20 13:01:20 19.66 
N18 25-Jun-20 13:01:20 25.51 
N18 09-Jul-20 13:16:54 1.62 
N18 09-Jul-20 13:16:54 10.02 
N18 09-Jul-20 13:16:54 10.02 
N18 09-Jul-20 13:16:54 19.89 
N18 09-Jul-20 13:16:54 25.99 
N18 14-Jul-20 09:29:28 1.78 
N18 14-Jul-20 09:29:28 5.31 
N18 14-Jul-20 09:29:28 9.27 
N18 14-Jul-20 09:29:28 9.27 
N18 14-Jul-20 09:29:28 15.79 
N18 14-Jul-20 09:29:28 24.63 
N18 19-Aug-20 09:05:20 1.39 
N18 19-Aug-20 09:05:20 9.07 
N18 19-Aug-20 09:05:20 13.94 
N18 19-Aug-20 09:05:20 19.73 
N18 19-Aug-20 09:05:20 19.73 
N18 19-Aug-20 09:05:20 25.94 
N18 02-Sep-20 09:04:54 2.15 
N18 02-Sep-20 09:04:54 6.97 
23 of 55

Fact Sheet Permit No.MA0103284
2022 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Minimum 1.16 7.26 7.151 
Maximum 27.15 39.83 33.33 
Median 12.24 15.6 11.44295 
N18 02-Sep-20 09:04:54 15.01 
N18 02-Sep-20 09:04:54 15.01 
N18 02-Sep-20 09:04:54 18.97 
N18 02-Sep-20 09:04:54 23.6 
N18 20-Oct-20 09:05:21 1.67 
N18 20-Oct-20 09:05:21 7.77 
N18 20-Oct-20 09:05:21 13.61 
N18 20-Oct-20 09:05:21 13.61 
N18 20-Oct-20 09:05:21 19.04 
N18 20-Oct-20 09:05:21 24.46 
24 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Bottom DO 
Units EST m mg/L 
Minimum 6.65 
Maximum 11.47 
Median 9.16 
N18 12-Feb-16 13:35:41 26.79 10.00 
N18 23-Mar-16 10:02:44 23.42 10.05 
N18 18-Apr-16 09:48:26 25.74 9.92 
N18 18-May-16 09:33:20 23.07 9.35 
N18 25-May-16 06:54:25 23.98 9.19 
N18 01-Jun-16 06:43:29 21.92 10.25 
N18 21-Jun-16 10:03:23 23.02 9.71 
N18 26-Jul-16 09:15:58 21.85 8.43 
N18 23-Aug-16 09:58:12 23.06 7.92 
N18 03-Oct-16 10:55:43 27.09 7.72 
N18 01-Nov-16 10:55:09 23.77 8.01 
N18 18-Feb-17 11:08:11 19.44 10.08 
N18 25-Mar-17 09:19:31 26.03 10.51 
N18 24-Apr-17 10:38:53 25.73 9.86 
N18 16-May-17 10:14:36 25.85 9.78 
N18 13-Jun-17 09:41:19 26.1 8.89 
N18 21-Jun-17 12:38:37 20.11 9.16 
N18 28-Jun-17 12:56:43 23.71 9.17 
N18 08-Jul-17 12:45:27 24.76 9.19 
N18 16-Jul-17 12:31:54 21.11 9.10 
N18 26-Jul-17 09:55:36 26.66 9.37 
N18 23-Aug-17 09:53:12 23.95 8.17 
N18 06-Sep-17 09:20:37 24.29 7.68 
N18 01-Nov-17 09:34:50 23.9 7.49 
N18 06-Feb-18 10:57:52 23.85 10.37 
N18 20-Mar-18 10:00:55 27.13 10.32 
N18 10-Apr-18 09:35:11 24.15 10.29 
N18 15-May-18 09:50:45 22.85 9.90 
N18 22-Jun-18 11:01:01 25.31 9.04 
N18 24-Jul-18 10:33:31 26.17 8.89 
N18 21-Aug-18 10:11:45 23.81 8.00 
N18 05-Sep-18 10:26:44 23.54 7.00 
N18 23-Oct-18 10:55:43 23.74 7.42 
N18 05-Feb-19 10:42:07 24.08 10.44 
N18 20-Mar-19 09:51:03 22.92 10.63 
N18 11-Apr-19 12:30:25 22.88 11.47 
25 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Bottom DO 
Units EST m mg/L 
Minimum 6.65 
Maximum 11.47 
Median 9.16 
N18 16-May-19 10:48:21 24.38 8.81 
N18 22-May-19 08:08:45 26.59 9.20 
N18 30-May-19 14:36:31 20.22 9.49 
N18 06-Jun-19 10:45:38 25.1 9.15 
N18 12-Jun-19 06:45:37 23.45 8.83 
N18 19-Jun-19 06:58:49 23.75 9.14 
N18 27-Jun-19 06:56:28 22.61 8.42 
N18 10-Jul-19 06:48:12 23.63 9.08 
N18 17-Jul-19 10:11:44 22.13 8.12 
N18 31-Jul-19 06:50:49 21.67 9.20 
N18 21-Aug-19 09:52:57 22.23 8.73 
N18 04-Sep-19 08:53:19 21.25 7.98 
N18 30-Oct-19 09:29:21 22.54 8.02 
N18 11-Feb-20 10:32:55 27 10.19 
N18 04-May-20 09:39:16 24.67 10.08 
N18 18-May-20 09:16:28 25.33 9.48 
N18 16-Jun-20 09:16:50 24.99 8.66 
N18 25-Jun-20 13:01:20 25.55 9.40 
N18 09-Jul-20 13:16:54 25.88 9.44 
N18 14-Jul-20 09:29:28 24.64 9.06 
N18 19-Aug-20 09:05:20 26.01 7.78 
N18 02-Sep-20 09:04:54 23.62 6.65 
N18 20-Oct-20 09:05:21 24.42 7.17 
26 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 12-Feb-16 14:11:31 2.28 3.72 9.29 8.432 0.208 
N21 12-Feb-16 14:11:31 8.13 4.56 8.148 0.182 
N21 12-Feb-16 14:11:31 16.11 3.53 0.371 8.494 0.156 
N21 12-Feb-16 14:11:31 16.11 3.63 
N21 12-Feb-16 14:11:31 26.4 0.0584 8.404 0.156 
N21 12-Feb-16 14:11:31 34.87 2.84 0.145 8.427 0.153 
N21 23-Mar-16 10:32:41 1.94 0.92 4.47 5.67 0.13 
N21 23-Mar-16 10:32:41 10.1 24.8 7.268 0.232 
N21 23-Mar-16 10:32:41 18.93 0.38 23.8 7.227 0.243 
N21 23-Mar-16 10:32:41 18.93 0.37 
N21 23-Mar-16 10:32:41 28 3.9 6.924 0.146 
N21 23-Mar-16 10:32:41 35.31 0.29 3.74 8.092 0.128 
N21 18-Apr-16 10:18:30 2 2.69 7.29 4.462 0.318 
N21 18-Apr-16 10:18:30 11.62 5.95 4.68 0.3 
N21 18-Apr-16 10:18:30 20.7 3.9 1.36 3.929 0.211 
N21 18-Apr-16 10:18:30 20.7 3.63 
N21 18-Apr-16 10:18:30 28.19 3.01 4.67 0.21 
N21 18-Apr-16 10:18:30 33.73 2.67 1.33 4.924 0.196 
N21 18-May-16 10:02:14 1.7 2.2 0.121 <0.025 0.0455 
N21 18-May-16 10:02:14 7.24 0.736 0.1335 0.0485 
N21 18-May-16 10:02:14 11.44 5.77 3.93 0.74 0.136 
N21 18-May-16 10:02:14 11.44 6.2 
N21 18-May-16 10:02:14 20.03 25.9 3.376 0.424 
N21 18-May-16 10:02:14 32.09 0.25 3.37 4.113 0.287 
N21 21-Jun-16 10:33:06 1.95 1.53 0.149 <0.025 <0.013 
N21 21-Jun-16 10:33:06 8.9 0.162 <0.025 <0.013 
N21 21-Jun-16 10:33:06 16.2 2.13 0.28 <0.025 <0.013 
N21 21-Jun-16 10:33:06 16.2 2.08 
N21 21-Jun-16 10:33:06 25.28 23.4 2.773 0.377 
N21 21-Jun-16 10:33:06 33.99 0.63 6.55 3.542 0.288 
N21 26-Jul-16 09:44:50 1.21 1.01 0.797 0.0473 <0.013 
N21 26-Jul-16 09:44:50 6.88 5.37 1.1594 0.0706 
N21 26-Jul-16 09:44:50 10.47 1.49 22.1 3.839 0.321 
N21 26-Jul-16 09:44:50 10.47 1.64 
N21 26-Jul-16 09:44:50 19.73 23.4 5.757 0.343 
N21 26-Jul-16 09:44:50 31.79 0.51 7.28 5.85 0.28 
27 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 23-Aug-16 10:39:29 1.63 1.99 0.889 0.0402 <0.013 
N21 23-Aug-16 10:39:29 7.6 2.37 0.525 0.024 
N21 23-Aug-16 10:39:29 12.65 2.69 13.3 2.879 0.181 
N21 23-Aug-16 10:39:29 12.65 2.8 
N21 23-Aug-16 10:39:29 22.82 7.01 3.392 0.278 
N21 23-Aug-16 10:39:29 33.11 1.15 5.44 4.856 0.244 
N21 03-Oct-16 11:26:31 1.63 2.08 6.18 0.086 0.101 
N21 03-Oct-16 11:26:31 7.72 3.07 0.2557 0.0553 
N21 03-Oct-16 11:26:31 16.62 2.46 0.497 0.1056 0.0644 
N21 03-Oct-16 11:26:31 16.62 2.58 
N21 03-Oct-16 11:26:31 26.42 0.476 0.1282 0.0558 
N21 03-Oct-16 11:26:31 34.16 1.58 0.365 0.1268 0.0722 
N21 01-Nov-16 11:26:25 1.82 2.22 5.54 4.132 0.408 
N21 01-Nov-16 11:26:25 10.89 5.05 3.974 0.396 
N21 01-Nov-16 11:26:25 19.29 1.83 5.48 3.977 0.403 
N21 01-Nov-16 11:26:25 19.29 1.96 
N21 01-Nov-16 11:26:25 28.06 1.79 3.888 0.332 
N21 01-Nov-16 11:26:25 34.03 1.76 1.51 3.938 0.332 
N21 18-Feb-17 11:39:32 1.58 3.24 7.195 0.255 
N21 18-Feb-17 11:39:32 9.07 3.42 7.116 0.244 
N21 18-Feb-17 11:39:32 16.81 3.41 7.238 0.232 
N21 18-Feb-17 11:39:32 16.81 3.63 
N21 18-Feb-17 11:39:32 24.24 6.964 0.216 
N21 18-Feb-17 11:39:32 31.98 7.026 0.304 
N21 25-Mar-17 09:48:59 1.28 1.52 13.4 6.495 0.195 
N21 25-Mar-17 09:48:59 10.42 1.54 10.6 6.592 0.168 
N21 25-Mar-17 09:48:59 18.83 1.29 4.55 6.495 0.145 
N21 25-Mar-17 09:48:59 18.83 1.23 
N21 25-Mar-17 09:48:59 27.11 2.59 6.483 0.147 
N21 25-Mar-17 09:48:59 34.3 1.96 6.357 0.153 
N21 24-Apr-17 11:14:18 1.7 2.82 0.33 0.2672 0.0268 
N21 24-Apr-17 11:14:18 8.58 2.5 4.94 2.017 0.113 
N21 24-Apr-17 11:14:18 16.62 2.87 16.8 6.572 0.328 
N21 24-Apr-17 11:14:18 16.62 2.75 
N21 24-Apr-17 11:14:18 26.43 8.71 6.579 0.251 
N21 24-Apr-17 11:14:18 33.38 3.73 6.982 0.188 
28 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 16-May-17 10:47:43 1.46 2.13 0.286 0.5971 0.0539 
N21 16-May-17 10:47:43 8.71 2.39 0.282 0.3717 0.0283 
N21 16-May-17 10:47:43 8.71 2.63 
N21 16-May-17 10:47:43 16.99 1.6 1.78 0.2311 0.0419 
N21 16-May-17 10:47:43 25.16 10.6 0.925 0.155 
N21 16-May-17 10:47:43 32.83 9.98 1.856 0.174 
N21 13-Jun-17 10:13:20 1.88 1.77 0.147 <0.025 0.0243 
N21 13-Jun-17 10:13:20 7.79 1.37 1.15 0.5731 0.0719 
N21 13-Jun-17 10:13:20 13.7 1.25 21 3.336 0.444 
N21 13-Jun-17 10:13:20 13.7 1.31 
N21 13-Jun-17 10:13:20 23.08 10.8 3.369 0.331 
N21 13-Jun-17 10:13:20 32.83 4.77 3.621 0.249 
N21 26-Jul-17 10:23:58 1.76 1.98 <0.028 0.0769 0.0301 
N21 26-Jul-17 10:23:58 10.1 3.47 <0.028 0.0899 0.0181 
N21 26-Jul-17 10:23:58 15.1 <0.028 0.0882 0.0158 
N21 26-Jul-17 10:23:58 22.41 2.67 8.79 0.597 0.169 
N21 26-Jul-17 10:23:58 22.41 1.9 
N21 26-Jul-17 10:23:58 32.71 11.8 1.356 0.284 
N21 23-Aug-17 10:31:19 1.84 1.55 <0.028 0.162 <0.013 
N21 23-Aug-17 10:31:19 8.42 1.89 0.187 0.3318 0.0412 
N21 23-Aug-17 10:31:19 8.42 1.39 
N21 23-Aug-17 10:31:19 15.97 1.67 6.81 3.618 0.332 
N21 23-Aug-17 10:31:19 24.5 2.83 4.214 0.356 
N21 23-Aug-17 10:31:19 34.31 1.06 5.117 0.363 
N21 06-Sep-17 09:51:13 1.64 6.48 <0.028 0.1713 0.0437 
N21 06-Sep-17 09:51:13 6.88 4.48 0.317 0.5717 0.0933 
N21 06-Sep-17 09:51:13 16.14 4.61 7.33 2.978 0.262 
N21 06-Sep-17 09:51:13 16.14 5.07 
N21 06-Sep-17 09:51:13 25.46 9.57 6.864 0.306 
N21 06-Sep-17 09:51:13 34.36 0.7 7.434 0.276 
N21 01-Nov-17 10:05:29 1.51 3.84 <0.028 5.086 0.194 
N21 01-Nov-17 10:05:29 8.03 4.06 <0.028 5.393 0.207 
N21 01-Nov-17 10:05:29 8.03 3.96 
N21 01-Nov-17 10:05:29 15.95 3.4 <0.028 5.461 0.189 
N21 01-Nov-17 10:05:29 24.96 <0.028 6.352 0.208 
N21 01-Nov-17 10:05:29 33.25 <0.028 6.723 0.157 
29 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 06-Feb-18 11:31:16 2.12 1.5 5.63 7.899 0.111 
N21 06-Feb-18 11:31:16 10.46 1.37 4.71 8.1606 0.0894 
N21 06-Feb-18 11:31:16 18.02 1.41 2.6 7.971 0.109 
N21 06-Feb-18 11:31:16 18.02 1.8 
N21 06-Feb-18 11:31:16 25.63 2.47 7.924 0.066 
N21 06-Feb-18 11:31:16 33.13 1.74 7.9997 0.0503 
N21 20-Mar-18 10:33:19 1.58 0.64 8.32 8.357 0.213 
N21 20-Mar-18 10:33:19 9.08 0.66 7.06 8.257 0.203 
N21 20-Mar-18 10:33:19 16.57 0.73 4.92 8.018 0.182 
N21 20-Mar-18 10:33:19 16.57 0.76 
N21 20-Mar-18 10:33:19 25.95 2.28 8.088 0.132 
N21 20-Mar-18 10:33:19 33.94 2.04 8.705 0.125 
N21 02-Apr-18 09:40:00 0.1 
N21 02-Apr-18 09:40:00 33.1 
N21 10-Apr-18 10:03:20 1.51 1.08 9.92 6.207 0.303 
N21 10-Apr-18 10:03:20 9.92 1.15 8.74 5.862 0.288 
N21 10-Apr-18 10:03:20 18.08 1.18 4.94 6.237 0.243 
N21 10-Apr-18 10:03:20 18.08 1.29 
N21 10-Apr-18 10:03:20 24.11 1.52 6.585 0.195 
N21 10-Apr-18 10:03:20 31.85 1.34 6.262 0.198 
N21 01-May-18 09:50:00 0.1 
N21 01-May-18 09:50:00 32.8 
N21 15-May-18 09:22:35 1.7 1.7 0.902 0.108 <0.013 
N21 15-May-18 09:22:35 8.28 2.19 13.6 0.872 0.168 
N21 15-May-18 09:22:35 8.28 2.15 
N21 15-May-18 09:22:35 14.8 1.6 16 1.124 0.196 
N21 15-May-18 09:22:35 24.92 14.8 1.64 0.21 
N21 15-May-18 09:22:35 33.63 6.17 1.747 0.123 
N21 01-Jun-18 09:27:00 0.1 
N21 01-Jun-18 09:27:00 32.1 
N21 22-Jun-18 11:32:17 2.06 0.62 0.354 0.0518 <0.013 
N21 22-Jun-18 11:32:17 7.55 1.09 0.745 0.31 <0.013 
N21 22-Jun-18 11:32:17 15.29 2.66 11.2 1.519 0.141 
N21 22-Jun-18 11:32:17 15.29 2.38 
N21 22-Jun-18 11:32:17 22.96 11.9 2.72 0.24 
N21 22-Jun-18 11:32:17 32.35 2.1 3.597 0.213 
30 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 13-Jul-18 09:53:00 0.1 
N21 13-Jul-18 09:53:00 34.2 
N21 24-Jul-18 11:04:21 2.06 2.39 <0.028 0.0027 0.0516 
N21 24-Jul-18 11:04:21 8.28 3.17 <0.028 0.023 0.148 
N21 24-Jul-18 11:04:21 15.34 5.21 <0.028 0 0.0603 
N21 24-Jul-18 11:04:21 15.34 5.69 
N21 24-Jul-18 11:04:21 24.48 18 1.91 0.34 
N21 24-Jul-18 11:04:21 32.59 7.17 2.068 0.342 
N21 10-Aug-18 09:45:00 0.1 
N21 10-Aug-18 09:45:00 41.7 
N21 21-Aug-18 10:44:48 2.19 3.19 0.144 0.0438 <0.013 
N21 21-Aug-18 10:44:48 7.24 3.88 0.127 0.0299 0.0198 
N21 21-Aug-18 10:44:48 7.24 4.06 
N21 21-Aug-18 10:44:48 16.26 3 0.186 0.0256 0.0134 
N21 21-Aug-18 10:44:48 21.8 17.7 1.318 0.272 
N21 21-Aug-18 10:44:48 32.89 4.26 2.528 0.332 
N21 04-Sep-18 09:21:00 0.1 
N21 04-Sep-18 09:21:00 31.5 
N21 05-Sep-18 10:43:19 1.82 3.09 0.296 <0.025 <0.013 
N21 05-Sep-18 10:43:19 7.8 3.35 9.75 3.83 0.4 
N21 05-Sep-18 10:43:19 7.8 5.03 
N21 05-Sep-18 10:43:19 14.92 0.76 19.3 6.298 0.582 
N21 05-Sep-18 10:43:19 23.33 7.06 6.131 0.579 
N21 05-Sep-18 10:43:19 32.05 3.24 6.859 0.431 
N21 19-Oct-18 08:32:00 0.1 
N21 23-Oct-18 12:15:21 2.28 6.11 0.129 0.1397 0.0473 
N21 23-Oct-18 12:15:21 8.37 6.24 0.26 0.1313 0.0627 
N21 23-Oct-18 12:15:21 14.22 4.47 0.51 0.3151 0.0659 
N21 23-Oct-18 12:15:21 14.22 4.9 
N21 23-Oct-18 12:15:21 23.36 0.418 3.778 0.222 
N21 23-Oct-18 12:15:21 31.58 0.492 7.935 0.225 
N21 01-Nov-18 09:15:00 0.1 
N21 05-Dec-18 10:46:00 0.1 
N21 18-Jan-19 10:18:00 0.1 
N21 04-Feb-19 10:08:00 0.1 
N21 05-Feb-19 11:07:22 1.44 5.59 6.79 6.006 0.234 
31 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 05-Feb-19 11:07:22 10.46 3.94 5.51 6.023 0.227 
N21 05-Feb-19 11:07:22 19.17 4.42 3.91 5.902 0.168 
N21 05-Feb-19 11:07:22 19.17 4.74 
N21 05-Feb-19 11:07:22 26.78 0.804 6.395 0.125 
N21 05-Feb-19 11:07:22 33.73 0.605 6.684 0.126 
N21 01-Mar-19 10:59:00 0.1 
N21 20-Mar-19 10:24:25 1.35 0.12 10 7.008 0.232 
N21 20-Mar-19 10:24:25 7.81 0.19 9.09 6.644 0.226 
N21 20-Mar-19 10:24:25 16.77 0.64 3.52 6.538 0.192 
N21 20-Mar-19 10:24:25 16.77 0.58 
N21 20-Mar-19 10:24:25 27.43 0.347 6.489 0.151 
N21 20-Mar-19 10:24:25 34.93 0.109 6.521 0.179 
N21 02-Apr-19 09:25:00 0.1 
N21 11-Apr-19 12:03:30 1.64 5.24 2.21 0.6312 0.0718 
N21 11-Apr-19 12:03:30 7.31 3.42 11.7 0.95 0.15 
N21 11-Apr-19 12:03:30 7.31 3.79 
N21 11-Apr-19 12:03:30 15.47 4.65 9.42 0.735 0.128 
N21 11-Apr-19 12:03:30 24 3.12 0.7862 0.0718 
N21 11-Apr-19 12:03:30 31.92 2.28 1.3303 0.0797 
N21 01-May-19 10:02:05 0.1 
N21 01-May-19 10:02:05 33.1 
N21 16-May-19 11:20:47 1.52 2.84 0.253 <0.025 0.0162 
N21 16-May-19 11:20:47 7.25 1.74 1.33 0.2789 0.0311 
N21 16-May-19 11:20:47 7.25 2.62 
N21 16-May-19 11:20:47 14.62 1.32 12.6 1.783 0.207 
N21 16-May-19 11:20:47 24.19 29.1 3.624 0.446 
N21 16-May-19 11:20:47 32.6 8.8 3.886 0.234 
N21 06-Jun-19 11:19:03 2.49 1.14 0.311 0.086 <0.013 
N21 06-Jun-19 11:19:03 7.79 1.76 3.69 0.5609 0.0311 
N21 06-Jun-19 11:19:03 13.46 1.25 21.6 3.518 0.202 
N21 06-Jun-19 11:19:03 13.46 1.04 
N21 06-Jun-19 11:19:03 24.85 22 4.888 0.262 
N21 06-Jun-19 11:19:03 34.42 4.45 5.296 0.194 
N21 07-Jun-19 10:17:00 0.1 
N21 07-Jun-19 10:17:00 33.4 
N21 02-Jul-19 10:25:00 0.1 
32 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 02-Jul-19 10:25:00 33.3 
N21 17-Jul-19 10:38:53 1.96 2.51 <0.028 0.3631 0.0519 
N21 17-Jul-19 10:38:53 5.74 3.78 0.0957 0.4541 0.0659 
N21 17-Jul-19 10:38:53 5.74 1.84 
N21 17-Jul-19 10:38:53 13.9 0.58 10.8 3.281 0.289 
N21 17-Jul-19 10:38:53 24.26 5.96 5.611 0.319 
N21 17-Jul-19 10:38:53 32.97 18.2 4.78 0.38 
N21 02-Aug-19 10:11:00 0.1 
N21 02-Aug-19 10:11:00 33.5 
N21 21-Aug-19 10:22:48 1.87 2.19 <0.028 0.0333 0.028 
N21 21-Aug-19 10:22:48 10.34 2.69 7.95 1.431 0.219 
N21 21-Aug-19 10:22:48 10.34 0.94 
N21 21-Aug-19 10:22:48 17.65 0.42 18.5 3.403 0.457 
N21 21-Aug-19 10:22:48 25.69 2.22 5.897 0.383 
N21 21-Aug-19 10:22:48 32.15 4.44 3.881 0.379 
N21 04-Sep-19 08:29:14 2.31 15.6 0.448 0.0276 <0.013 
N21 04-Sep-19 08:29:14 7.61 3.86 0.606 0.0307 <0.013 
N21 04-Sep-19 08:29:14 7.61 5.15 
N21 04-Sep-19 08:29:14 15.23 0.91 10.5 1.304 0.216 
N21 04-Sep-19 08:29:14 23.58 12.9 2.156 0.284 
N21 04-Sep-19 08:29:14 31.31 3.15 2.751 0.229 
N21 09-Sep-19 10:25:00 0.1 
N21 09-Sep-19 10:25:00 34.5 
N21 08-Oct-19 10:17:00 0.1 
N21 08-Oct-19 10:17:00 32.7 
N21 30-Oct-19 09:56:32 1.52 3.06 10.1 2.414 0.466 
N21 30-Oct-19 09:56:32 7.98 1.81 11.2 2.33 0.44 
N21 30-Oct-19 09:56:32 15.6 1.86 7.33 2.287 0.413 
N21 30-Oct-19 09:56:32 15.6 1.29 
N21 30-Oct-19 09:56:32 25.29 2.4 2.213 0.367 
N21 30-Oct-19 09:56:32 33.21 1.59 2.606 0.364 
N21 04-Nov-19 10:56:00 0.1 
N21 23-Dec-19 09:52:00 0.1 
N21 03-Jan-20 10:40:00 0.1 
N21 04-Feb-20 10:36:00 0.1 
N21 11-Feb-20 11:03:15 2.05 0.31 9.63 8.811 0.249 
33 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 11-Feb-20 11:03:15 7.53 0.43 8.93 8.673 0.247 
N21 11-Feb-20 11:03:15 16.31 0.48 6.39 9.007 0.233 
N21 11-Feb-20 11:03:15 16.31 0.37 
N21 11-Feb-20 11:03:15 24.53 3.85 9.121 0.219 
N21 11-Feb-20 11:03:15 34.34 3.35 9.269 0.211 
N21 06-Mar-20 10:32:00 0.1 
N21 07-Apr-20 09:29:00 0.1 
N21 04-May-20 10:08:00 1.83 1.72 5.02 0.475 0.168 
N21 04-May-20 10:08:00 8.71 2.49 7.02 0.618 0.233 
N21 04-May-20 10:08:00 15.17 2.56 0.264 0.7546 0.0524 
N21 04-May-20 10:08:00 15.17 2.74 
N21 04-May-20 10:08:00 24.55 0.0378 0.3654 0.0326 
N21 04-May-20 10:08:00 33.63 6.44 0.43 0.221 
N21 06-May-20 10:14:00 0.1 
N21 18-May-20 09:39:45 1.88 1.95 0.0483 0.0611 <0.013 
N21 18-May-20 09:39:45 9.31 0.85 3.22 0.3195 0.0665 
N21 18-May-20 09:39:45 15.53 0.74 4.92 0.4695 0.0995 
N21 18-May-20 09:39:45 15.53 0.77 
N21 18-May-20 09:39:45 24.73 0.0649 0.3264 0.0206 
N21 18-May-20 09:39:45 32.83 0.513 0.7485 0.0625 
N21 02-Jun-20 09:45:00 0.1 
N21 16-Jun-20 09:41:22 1.7 0.78 0.293 <0.025 <0.013 
N21 16-Jun-20 09:41:22 8.09 0.4 0.338 0.03 <0.013 
N21 16-Jun-20 09:41:22 15.4 1.25 7.65 1.044 0.106 
N21 16-Jun-20 09:41:22 15.4 1.64 
N21 16-Jun-20 09:41:22 23.69 15.9 2.94 0.28 
N21 16-Jun-20 09:41:22 31.49 6.22 3.261 0.249 
N21 09-Jul-20 09:53:00 0.1 
N21 14-Jul-20 09:52:00 2.15 1.38 0.132 0.0598 <0.013 
N21 14-Jul-20 09:52:00 4.76 0.96 1 0.2505 0.0235 
N21 14-Jul-20 09:52:00 10.61 9.98 2.114 0.226 
N21 14-Jul-20 09:52:00 10.61 
N21 14-Jul-20 09:52:00 20.24 11.5 3.111 0.289 
N21 14-Jul-20 09:52:00 32.42 2.3 3.026 0.204 
N21 06-Aug-20 09:30:00 0.1 
N21 19-Aug-20 09:36:50 1.64 0.42 0.0633 0.0296 <0.013 
34 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Chlorophyll Ammonium Nitrate Nitrite 
Units EST m ug/L uM uM uM 
Min 0.12 0.0378 0 0.0134 
Max 16.1 29.1 9.269 0.582 
Median 2.13 4.46 3.261 0.2055 
N21 19-Aug-20 09:36:50 9.62 0.88 0.163 <0.025 <0.013 
N21 19-Aug-20 09:36:50 17.6 3.92 8.64 0.365 0.116 
N21 19-Aug-20 09:36:50 17.6 5.05 
N21 19-Aug-20 09:36:50 25.15 18.2 1.6 0.27 
N21 19-Aug-20 09:36:50 34.78 7.84 1.97 0.23 
N21 01-Sep-20 10:16:00 0.1 
N21 02-Sep-20 09:26:35 2.09 16.1 <0.028 0.0276 <0.013 
N21 02-Sep-20 09:26:35 8.24 5.12 <0.028 0.0311 <0.013 
N21 02-Sep-20 09:26:35 15.98 5.75 <0.028 0.0412 <0.013 
N21 02-Sep-20 09:26:35 15.98 4.1 
N21 02-Sep-20 09:26:35 24.88 <0.028 0.0638 <0.013 
N21 02-Sep-20 09:26:35 32.68 4.37 1.932 0.268 
N21 19-Oct-20 09:55:00 0.1 
N21 20-Oct-20 09:28:56 1.25 3.95 10.9 2.156 0.184 
N21 20-Oct-20 09:28:56 4.84 3.2 13.9 2.923 0.247 
N21 20-Oct-20 09:28:56 4.84 3.78 
N21 20-Oct-20 09:28:56 14.28 2.35 22 4.622 0.368 
N21 20-Oct-20 09:28:56 23.18 19.2 5.782 0.428 
N21 20-Oct-20 09:28:56 32.93 6.84 6.907 0.363 
N21 06-Nov-20 10:28:00 0.1 
N21 09-Dec-20 10:26:00 0.1 
35 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Min 9.07 7.36 
Max 43.26 39.19 
Median 18.03 13.575 
N21 12-Feb-16 14:11:31 2.28 27.72 19.08 
N21 12-Feb-16 14:11:31 8.13 21.54 13.21 
N21 12-Feb-16 14:11:31 16.11 16.92 8.27 
N21 12-Feb-16 14:11:31 16.11 
N21 12-Feb-16 14:11:31 26.4 15.92 7.36 
N21 12-Feb-16 14:11:31 34.87 16.91 8.33 
N21 23-Mar-16 10:32:41 1.94 20.02 14.22 
N21 23-Mar-16 10:32:41 10.1 38.94 31.44 
N21 23-Mar-16 10:32:41 18.93 37.47 30 
N21 23-Mar-16 10:32:41 18.93 
N21 23-Mar-16 10:32:41 28 16.971 9.901 
N21 23-Mar-16 10:32:41 35.31 16.402 8.182 
N21 18-Apr-16 10:18:30 2 
N21 18-Apr-16 10:18:30 11.62 
N21 18-Apr-16 10:18:30 20.7 
N21 18-Apr-16 10:18:30 20.7 
N21 18-Apr-16 10:18:30 28.19 
N21 18-Apr-16 10:18:30 33.73 
N21 18-May-16 10:02:14 1.7 12.53 12.4595 
N21 18-May-16 10:02:14 7.24 14.4 14.218 
N21 18-May-16 10:02:14 11.44 17.55 16.674 
N21 18-May-16 10:02:14 11.44 
N21 18-May-16 10:02:14 20.03 37.99 34.19 
N21 18-May-16 10:02:14 32.09 16.16 11.76 
N21 21-Jun-16 10:33:06 1.95 10.7 10.662 
N21 21-Jun-16 10:33:06 8.9 9.86 9.822 
N21 21-Jun-16 10:33:06 16.2 9.07 9.032 
N21 21-Jun-16 10:33:06 16.2 
N21 21-Jun-16 10:33:06 25.28 33.14 29.99 
N21 21-Jun-16 10:33:06 33.99 15.17 11.34 
N21 26-Jul-16 09:44:50 1.21 9.0965 9.0362 
N21 26-Jul-16 09:44:50 6.88 17.4465 16.2165 
N21 26-Jul-16 09:44:50 10.47 34.1465 29.9865 
N21 26-Jul-16 09:44:50 10.47 
N21 26-Jul-16 09:44:50 19.73 35.0165 28.9165 
N21 26-Jul-16 09:44:50 31.79 20.7665 14.6365 
36 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Min 9.07 7.36 
Max 43.26 39.19 
Median 18.03 13.575 
N21 23-Aug-16 10:39:29 1.63 9.52 9.4668 
N21 23-Aug-16 10:39:29 7.6 12.79 12.241 
N21 23-Aug-16 10:39:29 12.65 26.15 23.09 
N21 23-Aug-16 10:39:29 12.65 
N21 23-Aug-16 10:39:29 22.82 17.44 13.77 
N21 23-Aug-16 10:39:29 33.11 16.93 11.83 
N21 03-Oct-16 11:26:31 1.63 
N21 03-Oct-16 11:26:31 7.72 
N21 03-Oct-16 11:26:31 16.62 
N21 03-Oct-16 11:26:31 16.62 
N21 03-Oct-16 11:26:31 26.42 
N21 03-Oct-16 11:26:31 34.16 
N21 01-Nov-16 11:26:25 1.82 26.75 22.21 
N21 01-Nov-16 11:26:25 10.89 24.77 20.4 
N21 01-Nov-16 11:26:25 19.29 25.75 21.37 
N21 01-Nov-16 11:26:25 19.29 
N21 01-Nov-16 11:26:25 28.06 18.39 14.17 
N21 01-Nov-16 11:26:25 34.03 18.03 13.76 
N21 18-Feb-17 11:39:32 1.58 31.79 24.34 
N21 18-Feb-17 11:39:32 9.07 30.13 22.77 
N21 18-Feb-17 11:39:32 16.81 25.52 18.05 
N21 18-Feb-17 11:39:32 16.81 
N21 18-Feb-17 11:39:32 24.24 21.22 14.04 
N21 18-Feb-17 11:39:32 31.98 17.79 10.46 
N21 25-Mar-17 09:48:59 1.28 25.29 18.6 
N21 25-Mar-17 09:48:59 10.42 23.91 17.15 
N21 25-Mar-17 09:48:59 18.83 18.11 11.47 
N21 25-Mar-17 09:48:59 18.83 
N21 25-Mar-17 09:48:59 27.11 15.9 9.27 
N21 25-Mar-17 09:48:59 34.3 15.06 8.55 
N21 24-Apr-17 11:14:18 1.7 10.33 10.036 
N21 24-Apr-17 11:14:18 8.58 14.62 12.49 
N21 24-Apr-17 11:14:18 16.62 30.18 23.28 
N21 24-Apr-17 11:14:18 16.62 
N21 24-Apr-17 11:14:18 26.43 22.79 15.96 
N21 24-Apr-17 11:14:18 33.38 18.25 11.08 
37 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Min 9.07 7.36 
Max 43.26 39.19 
Median 18.03 13.575 
N21 16-May-17 10:47:43 1.46 10.94 10.289 
N21 16-May-17 10:47:43 8.71 10.32 9.92 
N21 16-May-17 10:47:43 8.71 
N21 16-May-17 10:47:43 16.99 11.09 10.817 
N21 16-May-17 10:47:43 25.16 19.87 18.79 
N21 16-May-17 10:47:43 32.83 19.97 17.94 
N21 13-Jun-17 10:13:20 1.88 9.98 9.9307 
N21 13-Jun-17 10:13:20 7.79 10.51 9.865 
N21 13-Jun-17 10:13:20 13.7 30.26 26.48 
N21 13-Jun-17 10:13:20 13.7 
N21 13-Jun-17 10:13:20 23.08 21.35 17.65 
N21 13-Jun-17 10:13:20 32.83 15.72 11.85 
N21 26-Jul-17 10:23:58 1.76 11.35 11.243 
N21 26-Jul-17 10:23:58 10.1 12.25 12.142 
N21 26-Jul-17 10:23:58 15.1 9.51 9.406 
N21 26-Jul-17 10:23:58 22.41 25.32 24.554 
N21 26-Jul-17 10:23:58 22.41 
N21 26-Jul-17 10:23:58 32.71 32.58 30.94 
N21 23-Aug-17 10:31:19 1.84 10.4 10.225 
N21 23-Aug-17 10:31:19 8.42 10.42 10.047 
N21 23-Aug-17 10:31:19 8.42 
N21 23-Aug-17 10:31:19 15.97 15.71 11.76 
N21 23-Aug-17 10:31:19 24.5 16.58 12.01 
N21 23-Aug-17 10:31:19 34.31 13.33 7.85 
N21 06-Sep-17 09:51:13 1.64 13.79 13.575 
N21 06-Sep-17 09:51:13 6.88 13.57 12.905 
N21 06-Sep-17 09:51:13 16.14 22.03 18.79 
N21 06-Sep-17 09:51:13 16.14 
N21 06-Sep-17 09:51:13 25.46 27.82 20.65 
N21 06-Sep-17 09:51:13 34.36 15.21 7.5 
N21 01-Nov-17 10:05:29 1.51 14.13 8.85 
N21 01-Nov-17 10:05:29 8.03 14.83 9.23 
N21 01-Nov-17 10:05:29 8.03 
N21 01-Nov-17 10:05:29 15.95 15.46 9.81 
N21 01-Nov-17 10:05:29 24.96 14 7.44 
N21 01-Nov-17 10:05:29 33.25 14.71 7.83 
38 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Min 9.07 7.36 
Max 43.26 39.19 
Median 18.03 13.575 
N21 06-Feb-18 11:31:16 2.12 24.8 16.79 
N21 06-Feb-18 11:31:16 10.46 22.32 14.07 
N21 06-Feb-18 11:31:16 18.02 19.02 10.94 
N21 06-Feb-18 11:31:16 18.02 
N21 06-Feb-18 11:31:16 25.63 20 12.01 
N21 06-Feb-18 11:31:16 33.13 18 9.95 
N21 20-Mar-18 10:33:19 1.58 26.33 17.76 
N21 20-Mar-18 10:33:19 9.08 23.84 15.38 
N21 20-Mar-18 10:33:19 16.57 21.87 13.67 
N21 20-Mar-18 10:33:19 16.57 
N21 20-Mar-18 10:33:19 25.95 18.88 10.66 
N21 20-Mar-18 10:33:19 33.94 17.42 8.59 
N21 02-Apr-18 09:40:00 0.1 
N21 02-Apr-18 09:40:00 33.1 
N21 10-Apr-18 10:03:20 1.51 28.68 22.17 
N21 10-Apr-18 10:03:20 9.92 26.66 20.51 
N21 10-Apr-18 10:03:20 18.08 21.69 15.21 
N21 10-Apr-18 10:03:20 18.08 
N21 10-Apr-18 10:03:20 24.11 17.018 10.238 
N21 10-Apr-18 10:03:20 31.85 14.971 8.511 
N21 01-May-18 09:50:00 0.1 
N21 01-May-18 09:50:00 32.8 
N21 15-May-18 09:22:35 1.7 12.72 12.599 
N21 15-May-18 09:22:35 8.28 27.15 26.11 
N21 15-May-18 09:22:35 8.28 
N21 15-May-18 09:22:35 14.8 30.89 29.57 
N21 15-May-18 09:22:35 24.92 28.1 26.25 
N21 15-May-18 09:22:35 33.63 16.27 14.4 
N21 01-Jun-18 09:27:00 0.1 
N21 01-Jun-18 09:27:00 32.1 
N21 22-Jun-18 11:32:17 2.06 10.67 10.6052 
N21 22-Jun-18 11:32:17 7.55 12.81 12.487 
N21 22-Jun-18 11:32:17 15.29 26.67 25.01 
N21 22-Jun-18 11:32:17 15.29 
N21 22-Jun-18 11:32:17 22.96 26.83 23.87 
N21 22-Jun-18 11:32:17 32.35 14.09 10.28 
39 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Min 9.07 7.36 
Max 43.26 39.19 
Median 18.03 13.575 
N21 13-Jul-18 09:53:00 0.1 
N21 13-Jul-18 09:53:00 34.2 
N21 24-Jul-18 11:04:21 2.06 16.4505 16.3962 
N21 24-Jul-18 11:04:21 8.28 13.5805 13.4095 
N21 24-Jul-18 11:04:21 15.34 17.3705 17.3102 
N21 24-Jul-18 11:04:21 15.34 
N21 24-Jul-18 11:04:21 24.48 33.9405 31.6905 
N21 24-Jul-18 11:04:21 32.59 22.0705 19.6605 
N21 10-Aug-18 09:45:00 0.1 
N21 10-Aug-18 09:45:00 41.7 
N21 21-Aug-18 10:44:48 2.19 13.46 13.4032 
N21 21-Aug-18 10:44:48 7.24 13 12.9503 
N21 21-Aug-18 10:44:48 7.24 
N21 21-Aug-18 10:44:48 16.26 12.04 12.001 
N21 21-Aug-18 10:44:48 21.8 30.08 28.49 
N21 21-Aug-18 10:44:48 32.89 18.94 16.08 
N21 04-Sep-18 09:21:00 0.1 
N21 04-Sep-18 09:21:00 31.5 
N21 05-Sep-18 10:43:19 1.82 12.47 12.432 
N21 05-Sep-18 10:43:19 7.8 26.75 22.52 
N21 05-Sep-18 10:43:19 7.8 
N21 05-Sep-18 10:43:19 14.92 34.85 27.97 
N21 05-Sep-18 10:43:19 23.33 24.4 17.69 
N21 05-Sep-18 10:43:19 32.05 18.24 10.95 
N21 19-Oct-18 08:32:00 0.1 
N21 23-Oct-18 12:15:21 2.28 11.53 11.343 
N21 23-Oct-18 12:15:21 8.37 13.08 12.886 
N21 23-Oct-18 12:15:21 14.22 11.33 10.949 
N21 23-Oct-18 12:15:21 14.22 
N21 23-Oct-18 12:15:21 23.36 11.91 7.91 
N21 23-Oct-18 12:15:21 31.58 17.84 9.68 
N21 01-Nov-18 09:15:00 0.1 
N21 05-Dec-18 10:46:00 0.1 
N21 18-Jan-19 10:18:00 0.1 
N21 04-Feb-19 10:08:00 0.1 
N21 05-Feb-19 11:07:22 1.44 
40 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Min 9.07 7.36 
Max 43.26 39.19 
Median 18.03 13.575 
N21 05-Feb-19 11:07:22 10.46 
N21 05-Feb-19 11:07:22 19.17 
N21 05-Feb-19 11:07:22 19.17 
N21 05-Feb-19 11:07:22 26.78 
N21 05-Feb-19 11:07:22 33.73 
N21 01-Mar-19 10:59:00 0.1 
N21 20-Mar-19 10:24:25 1.35 27.44 20.2 
N21 20-Mar-19 10:24:25 7.81 26.3 19.43 
N21 20-Mar-19 10:24:25 16.77 20.6 13.87 
N21 20-Mar-19 10:24:25 16.77 
N21 20-Mar-19 10:24:25 27.43 14.777 8.137 
N21 20-Mar-19 10:24:25 34.93 14.505 7.805 
N21 02-Apr-19 09:25:00 0.1 
N21 11-Apr-19 12:03:30 1.64 12.51 11.807 
N21 11-Apr-19 12:03:30 7.31 23.01 21.91 
N21 11-Apr-19 12:03:30 7.31 
N21 11-Apr-19 12:03:30 15.47 20.72 19.857 
N21 11-Apr-19 12:03:30 24 13.32 12.462 
N21 11-Apr-19 12:03:30 31.92 12.92 11.51 
N21 01-May-19 10:02:05 0.1 
N21 01-May-19 10:02:05 33.1 
N21 16-May-19 11:20:47 1.52 11.25 11.2088 
N21 16-May-19 11:20:47 7.25 11.26 10.95 
N21 16-May-19 11:20:47 7.25 
N21 16-May-19 11:20:47 14.62 20.04 18.05 
N21 16-May-19 11:20:47 24.19 43.26 39.19 
N21 16-May-19 11:20:47 32.6 20.05 15.93 
N21 06-Jun-19 11:19:03 2.49 10.54 10.441 
N21 06-Jun-19 11:19:03 7.79 13.86 13.268 
N21 06-Jun-19 11:19:03 13.46 36.1 32.38 
N21 06-Jun-19 11:19:03 13.46 
N21 06-Jun-19 11:19:03 24.85 39.53 34.38 
N21 06-Jun-19 11:19:03 34.42 18.03 12.54 
N21 07-Jun-19 10:17:00 0.1 
N21 07-Jun-19 10:17:00 33.4 
N21 02-Jul-19 10:25:00 0.1 
41 of 55

Fact Sheet Permit No.MA0103284
2023 Reissuance
Appendix E:Ambient Data 
Parameter Date Depth Total Nitrogen TKN 
Units EST m uM uM 
Min 9.07 7.36 
Max 43.26 39.19 
Median 18.03 13.575 
N21 02-Jul-19 10:25:00 33.3 
N21 17-Jul-19 10:38:53 1

The text goes on. The rest is in the file.