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December 24, 2019 (Revised January 22, 2020)

Ms. Shauna Little U.S. Environmental Protection Agency Office of Ecosystem Protection PA/OEP RGP Applications Coordinator 5 Post Office Square - Suite 100 (OEP06-01) , MA 02109-3912

Re: Notice of Intent for Application of a Remediation General Permit Former Alewife Automotive 395 Alewife Brook Somerville, MA

Dear Ms. Little:

Mark A. Germano, LSP (MAG), on behalf of 395 ABP, LLC, (ABP) has prepared the enclosed Notice of Intent (NOI) for application of Remediation General Permit (RGP) for remediation/construction activities at the above referenced site, a former gas station. The property has been a gas station since 1932. In March 1992 a release of gasoline was discovered based on a failed tank test. MADEP assigned RTN 3-2770 to the site. Over the course of the next five years Sunoco remediated the site through various techniques including excavation and pump and treat. The site was “closed” in September 1997 with a Notice of Activity and Use Limitation (AUL) implemented because of residual contaminated soil under the pump island and canopy. The AUL deed restricted residential use of the property.

In 2018 395 ABP bought the property with plans to demolish the gas station, to excavate the contaminated soil, to terminate the AUL and to construct a residential condominium complex. The depth to groundwater is approximately 4-7 bgs. In order to excavate the contaminated soil and construct a partial basement the site has to be dewatered. A granular activated carbon system is on-site and has already been used however the glacial soils are too dense for on-site discharge. Therefore, to remediate the site our best option is to discharge treated groundwater into the municipal drainage system which discharges into the Alewife Brook located across the street from the site. Removal of the contaminated soil will achieve a level of “No Significant Risk” for the Site in order to terminate the AUL.

Groundwater Characterization

In preparation for groundwater dewatering activities, a representative groundwater sample was collected from the Frac Tank on December 9, 2019. The sample was submitted to NET labs of Warwick, RI for analysis of volatile organic compounds (VOCs) via EPA Methods 624 and 8260, polynuclear aromatic hydrocarbons (PAHs) and phenols via EPA Method 625 SIM, total PCBs via EPA Method 8082, total metals via EPA Method 200.7, Oil and Grease via EPA Method 1664A, chloride via EPA Method 4500, ammonia via EPA Method 350.1, cyanide via EPA Method 335.4, ethanol via EPA method 8015 and total suspended solids via Standard Method 2540D. Groundwater temperature (35 degrees F) was recorded in the field.

In addition, a groundwater sample from a monitoring well located in the excavation was obtained prior to initiating construction. Volatile Petroleum Hydrocarbon (VPH), Extractable Petroleum Hydrocarbon (EPH), dissolved RCRA 8 Metals and VOC analyses was conducted on the sample. The results are attached the monitoring well is labelled MW-1. Also, the treatment system is set up and has operated with discharge to an on-site into trench. However the trench filled up quickly and water was unable to filter into the ground because the soils were too dense. These results are also attached. The effluent sample demonstrates the treatment system works effectively.

Receiving Water Characterization

Treated effluent will be discharged via a catch basin on Gordon Street adjacent to the site. Discharge of the catch basin will occur through the existing municipal drainage system into the Alewife Brook located across the street from the site. The City of Somerville has been notified of the planned discharge. Permission has been granted

This brook was sampled on December 9, 2019, at the outfall where the drainage system discharges to the brook. The surface water sample was submitted to NET Labs of Warwick, RIA for analysis of total metals via EPA Method 200.7, ammonia via EPA Method 350.1 and hardness via EPA Method 130.1. Receiving water analytical results are included as Attachment C. Temperature (40 degrees F) were collected in the field.

Alewife Brook is listed on the 303(d) list under Category 5 Waters – “Impairment caused by a pollutant – TMDL required.”

Proposed Treatment System

A Design Flow treatment system discharge rate of 25 gallons per minute (gpm) was used to evaluate the applicable RGP discharge standards. Extracted water from the excavation activities will be initially pumped into one 21,000-gallon fractionation tanks.

Following settling, extracted groundwater will be treated by passage through (at minimum) 50- micron particle filters, and through two 500-pound liquid-phase reactive carbon vessels. Flow will be measured using an in-line flowmeter and totalizer prior to the discharge into the catch basin.

MAG anticipates that the dewatering system will operate from approximately January 1, 2020 through March 2020. A Work Plan for the groundwater extraction and treatment systems satisfying the requirements of Section 2.5 of the RGP will be available at the Site prior to initiating dewatering activities. See Attachment B, Figure 4 for a Treatment System Schematic. Notice of Intent

Preparation of this NOI has included a review of the literature pertaining to Areas of Critical Environmental Concern, (ACECs), the Endangered Species Act, and the National Historic Preservation Act: • Review of the Massachusetts Geographic Information Systems MassDEP Priority Resources Map (Figure 5) in Attachment B shows the Site is not within an ACEC. • A review of the NHESP Priority Habitat Map was reviewed at MassGIS was reviewed indicating that there are no threatened, endangered, candidate species, or critical habitats in the proposed construction area • This work will not affect historical properties that are listed by the United States Park Service or Massachusetts Cultural Resources. The Massachusetts Historical Commission’s Massachusetts Cultural Resource Information System (MACRIS) listed no results found. See attached MACRIS results page. • A dilution factor was calculated to be 14.64 using Stream Stats to determine the 7Q10 mgd to be 0.759 ft3. using a maximum flow 25 gpm. This was confirmed by Catherine Vakalopoulos at MADEP. See Attachment E. The proposed treatment system has been designed to reduce contaminants of concern below the applicable effluent limits. Effluent compliance monitoring will be conducted in compliance with the RGP. Additionally, the flow rate, pH, and temperature of the effluent will be monitoring in the field and recorded.

We appreciate your assistance in processing this Notice of Intent.

Should you have any questions regarding this correspondence, please do not hesitate to contact the undersigned at (339)793-3528. Sincerely,

Mark A. Germano, LSP

Mark Germano President

Attachment A – RGP NOI Form Attachment B – Figures Figure 1 – Locus Plan Figure 2 – Site Plan and Proposed Construction Figure 3 – City of Somerville Drainage Layout Figure 4 – Treatment System Schematic Figure 5 – MassDEP Priority Resource Map Attachment C – Laboratory Analytical Data Attachment D – Massachusetts Cultural Resources in Vicinity of Site Attachment E-Stream Characteristics, Dilution Factor Comfirmation ATTACHMENT A NOI FORM MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 14 of 24

II. Suggested Format for the Remediation General Permit Notice of Intent (NOI)

A. General site information: 1. Name of site: Site address: 395 Alewife Brook Parkway Former Alewife Automotive Street:

City: State: Zip: Somerville MA 2. Site owner Contact Person: Chris Cormier 395 ABP, LLC Telephone: Email: 978-265-0444 [email protected] Mailing address: 324 Cmmonwelth Ave. Suite 4 Street: Owner is (check one): □ Federal □ State/Tribal □ Private City: State: Zip: □ Other; if so, specify: Boston MA 02115 3. Site operator, if different than owner Contact Person: Mark Germano Mark A. Germano, LSP Telephone: 339-793-3528 Email: [email protected] Mailing address: 15 Pinehurst Road Street:

City: Marshfield State:MA Zip: 02050 4. NPDES permit number assigned by EPA: 5. Other regulatory program(s) that apply to the site (check all that apply):

NA □ MA Chapter 21e; list RTN(s): 3-2770 □ CERCLA □ UIC Program NPDES permit is (check all that apply: □ RGP □ DGP □ CGP □ NH Groundwater Management Permit or □ POTW Pretreatment □ MSGP □ Individual NPDES permit □ Other; if so, specify: Groundwater Release Detection Permit: □ CWA Section 404 MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 15 of 24

B. Receiving water information: 1. Name of receiving water(s): Waterbody identification of receiving water(s): Classification of receiving water(s):

Alewife Brook MA71-04 Class B

Receiving water is (check any that apply): □ Outstanding Resource Water □ Ocean Sanctuary □ territorial sea □ Wild and Scenic River

2. Has the operator attached a location map in accordance with the instructions in B, above? (check one): □ Yes □ No Are sensitive receptors present near the site? (check one): □ Yes □ No If yes, specify: TMDL-5 3. Indicate if the receiving water(s) is listed in the State’s Integrated List of Waters (i.e., CWA Section 303(d)). Include which designated uses are impaired, and any pollutants indicated. Also, indicate if a final TMDL is available for any of the indicated pollutants. For more information, contact the appropriate State as noted in Part 4.6 of the RGP. Debris,copper, escherichia coli, scum, oil slicks, lead, diss oxygen, PCB in fish tissue, phosphorous, taste and odor 4. Indicate the seven day-ten-year low flow (7Q10) of the receiving water determined in accordance with the instructions in Appendix V for sites located in Massachusetts and Appendix VI for sites located in New Hampshire. 0.759 ft3/sec 5. Indicate the requested dilution factor for the calculation of water quality-based effluent limitations (WQBELs) determined in accordance with the instructions in Appendix V for sites in Massachusetts and Appendix VI for sites in New Hampshire. 14.64 6. Has the operator received confirmation from the appropriate State for the 7Q10and dilution factor indicated? (check one): □ Yes xxNo If yes, indicate date confirmation received: 1/22/20 7. Has the operator attached a summary of receiving water sampling results as required in Part 4.2 of the RGP in accordance with the instruction in Appendix VIII? (check one): □ Yes □ No

C. Source water information: 1. Source water(s) is (check any that apply):

□ Contaminated groundwater □ Contaminated surface water □ The receiving water □ Potable water; if so, indicate municipality or origin: Has the operator attached a summary of influent Has the operator attached a summary of influent □ A surface water other sampling results as required in Part 4.2 of the RGP sampling results as required in Part 4.2 of the than the receiving water; if in accordance with the instruction in Appendix RGP in accordance with the instruction in so, indicate waterbody: □ Other; if so, specify: VIII? (check one): Appendix VIII? (check one): □ Yes □ No □ Yes □ No MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 16 of 24

2. Source water contaminants: a. For source waters that are contaminated groundwater or contaminated b. For a source water that is a surface water other than the receiving water, potable water surface water, indicate are any contaminants present that are not included in or other, indicate any contaminants present at the maximum concentration in accordance the RGP? (check one): □ Yes □ No If yes, indicate the contaminant(s) and with the instructions in Appendix VIII? (check one): □ Yes □ No the maximum concentration present in accordance with the instructions in Appendix VIII. 3. Has the source water been previously chlorinated or otherwise contains residual chlorine? (check one): □ Yes □ No

D. Discharge information 1.The discharge(s) is a(n) (check any that apply): xx□ Existing discharge □ New discharge □ New source Outfall(s): Outfall location(s): (Latitude, Longitude) Outfall to Alewife Brook Serial # 001 42.413070 Latitude -71.132386 Longitude

Discharges enter the receiving water(s) via (check any that apply): □ Direct discharge to the receiving water □ Indirect discharge, if so, specify:

□ A private storm sewer system □ A municipal storm sewer system If the discharge enters the receiving water via a private or municipal storm sewer system: Has notification been provided to the owner of this system? (check one): □ Yes □ No Has the operator has received permission from the owner to use such system for discharges? (check one): □ Yes □ No, if so, explain, with an estimated timeframe for obtaining permission: Has the operator attached a summary of any additional requirements the owner of this system has specified? (check one): □ Yes □ No

Provide the expected start and end dates of discharge(s) (month/year): 12/2019-4/2020

Indicate if the discharge is expected to occur over a duration of: □ less than 12 months □ 12 months or more □ is an emergency discharge Has the operator attached a site plan in accordance with the instructions in D, above? (check one): □ Yes □ No MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 17 of 24

2. Activity Category: (check all that apply) 3. Contamination Type Category: (check all that apply)

a. If Activity Category I or II: (check all that apply)

□ A. Inorganics □ B. Non-Halogenated Volatile Organic Compounds □ C. Halogenated Volatile Organic Compounds □ D. Non-Halogenated Semi-Volatile Organic Compounds □ E. Halogenated Semi-Volatile Organic Compounds □ F. Fuels Parameters

□ I – Petroleum-Related Site Remediation □ II – Non-Petroleum-Related Site Remediation b. If Activity Category III, IV, V, VI, VII or VIII: (check either G or H) □ III – Contaminated Site Dewatering □ G. Sites with Known □ H. Sites with Unknown Contamination □ IV – Dewatering of Pipelines and Tanks Contamination □ V – Aquifer Pump Testing c. If Category III-G, IV-G, V-G, VI-G, □ VI – Well Development/Rehabilitation VII-G or VIII-G: (check all that apply) □ VII – Collection Structure Dewatering/Remediation □ VIII – Dredge-Related Dewatering □ A. Inorganics □ B. Non-Halogenated Volatile Organic Compounds d. If Category III-H, IV-H, V-H, VI-H, VII-H or □ C. Halogenated Volatile Organic VIII-H Contamination Type Categories A through Compounds F apply □ D. Non-Halogenated Semi-Volatile Organic Compounds □ E. Halogenated Semi-Volatile Organic Compounds □ F. Fuels Parameters MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 18 of 24

4. Influent and Effluent Characteristics Known Known Influent Effluent Limitations Test Detection or or # of Parameter method limit Daily Daily believed believed samples (#) (µg/l) maximum average TBEL WQBEL absent present (µg/l) (µg/l)

A. Inorganics

Ammonia x 2 E350.1 0.1 Report mg/L --- Chloride x 1 4500 25 324000 Report µg/l --- Total Residual Chlorine x 1 4500 0.2 mg/L Total Suspended Solids x 1 2540 2 8000 30 mg/L Antimony x 2 200.7 0.6 0.1 206 µg/L Arsenic x 2 200.7/601 0.1 16.4 104 µg/L Cadmium x 2 200.7/601 0.1 0.5 10.2 µg/L Chromium III x 2 200.7/601 0.1 0.5 323 µg/L Chromium VI x 2 200.7 0.1 0.491 323 µg/L Copper x 2 200.7 1 5.0 242 µg/L Iron x 1 200.7 0.1 3.0 5,000 µg/L Lead x 2 200.7 0.1 1.3 160 µg/L Mercury x 1 200.7/601 0.2 0.739 µg/L Nickel x 1 200.7 1.0 3.0 1,450 µg/L Selenium x 1 200.7 5.0 235.8 µg/L Silver x 1 200.7 0.1 35.1 µg/L Zinc x 2 200.7 0.1 1.3 420 µg/L Cyanide x 1 335.4 .01 178 mg/L

B. Non-Halogenated VOCs

Total BTEX x 1 624 1/10/20 13152 100 µg/L --- x Benzene 1 624 10 671 5.0 µg/L --- 1,4 Dioxane x 1 624 500 200 µg/L --- Acetone X 1 624 5 7.97 mg/L --- Phenol X 1 624 2 6 1,080 µg/L MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 19 of 24

Known Known Influent Effluent Limitations Test Detection or or # of Parameter method limit Daily Daily believed believed samples (#) (µg/l) maximum average TBEL WQBEL absent present (µg/l) (µg/l)

C. Halogenated VOCs Carbon Tetrachloride X 1 624 10 4.4 µg/L 1,2 Dichlorobenzene X 1 624 1 600 µg/L --- 1,3 Dichlorobenzene X 1 624 1 320 µg/L --- 1,4 Dichlorobenzene X 1 624 1 5.0 µg/L --- Total dichlorobenzene X 1 624 1 763 µg/L in NH --- 1,1 Dichloroethane X 1 624 1 70 µg/L --- 1,2 Dichloroethane X 1 624 1 5.0 µg/L --- 1,1 Dichloroethylene X 1 624 3.2 µg/L --- Ethylene Dibromide x 1 624 0.05 µg/L --- Methylene Chloride X 1 624 5 4.6 µg/L --- 1,1,1 Trichloroethane X 1 624 1 200 µg/L --- 1,1,2 Trichloroethane X 1 624 1 5.0 µg/L --- Trichloroethylene 5.0 µg/L --- X 1 624 1 Tetrachloroethylene 5.0 µg/L X 1 624 1 cis-1,2 Dichloroethylene X 1 624 1 70 µg/L --- Vinyl Chloride 2.0 µg/L --- X 1 624 1 D. Non-Halogenated SVOCs Total Phthalates X 1 625 2 3 190 µg/L Diethylhexyl phthalate X 1 625 2 101 µg/L Total Group I PAHs x 1 625 2 1.0 µg/L --- Benzo(a)anthracene X 1 625 2 Benzo(a)pyrene X 1 625 2 Benzo(b)fluoranthene X 1 625 2 Benzo(k)fluoranthene X 1 625 2 As Total PAHs Chrysene X 1 625 1 Dibenzo(a,h)anthracene X 1 625 2 X Indeno(1,2,3-cd)pyrene 1 625 2 MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 20 of 24

Known Known Influent Effluent Limitations Test Detection or or # of Parameter method limit Daily Daily believed believed samples (#) (µg/l) maximum average TBEL WQBEL absent present (µg/l) (µg/l) Total Group II PAHs X 1 625 2 100 µg/L --- Naphthalene X 1 625/8270 2 71 20 µg/L --- 40- degs F

E. Halogenated SVOCs Total PCBs X 1 608 0.2 0.000064 µg/L --- Pentachlorophenol X 1 625 5 1.0 µg/L ---

F. Fuels Parameters Total Petroleum X 3910 5.0 mg/L --- Hydrocarbons 1 8100 1000 Ethanol X 1 8260 10 Report mg/L --- Methyl-tert-Butyl Ether X 1 624 5 70 µg/L 120 µg/L in MA tert-Butyl Alcohol --- X 1 624 5 40 µg/L in NH 90 µg/L in MA tert-Amyl Methyl Ether --- X 1 6924 1 140 µg/L in NH

Other (i.e., pH, temperature, hardness, salinity, LC50, additional pollutants present); if so, specify: pH 1 7.2 Temperature 1 35 degrees F Hardness 1 200.7 .125 29.8 MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 21 of 24

E. Treatment system information 1. 1. Indicate the type(s) of treatment that will be applied to effluent prior to discharge: (check all that apply)

□ Adsorption/Absorption □ Advanced Oxidation Processes □ Air Stripping □ Granulated Activated Carbon (“GAC”)/Liquid Phase Carbon Adsorption □ Ion Exchange □ Precipitation/Coagulation/Flocculation □ Separation/Filtration □ Other; if so, specify:

2. 2. Provide a written description of all treatment system(s) or processes that will be applied to the effluent prior to discharge. Water from excavation will be pumped into a Frac tank. The water in the Frac tank will be pumped through a bag filter and two 500 pound Granulated Activated Carbon cannisters in series before being dischrged into a catch basin which is connected to the City of Somerville's drainage system whch discharges into the Alewife Brook.

Identify each major treatment component (check any that apply): □ Fractionation tanks□ Equalization tank □ Oil/water separator □ Mechanical filter □ Media filter □ Chemical feed tank □ Air stripping unit □ Bag filter □ Other; if so, specify:

Indicate if either of the following will occur (check any that apply): □ Chlorination □ De-chlorination

3. Provide the design flow capacity in gallons per minute (gpm) of the most limiting component. Indicate the most limiting component: TBD/Pump Bag Filter, Size of Carbon Canisters Is use of a flow meter feasible? (check one): □ Yes □ No, if so, provide justification:

Provide the proposed maximum effluent flow in gpm. 25 gpm

Provide the average effluent flow in gpm. 20 gpm

If Activity Category IV applies, indicate the estimated total volume of water that will be discharged:

4. Has the operator attached a schematic of flow in accordance with the instructions in E, above? (check one): □ Yes □ No MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 22 of 24

F. Chemical and additive information 1. Indicate the type(s) of chemical or additive that will be applied to effluent prior to discharge or that may otherwise be present in the discharge(s): (check all that apply)

□ Algaecides/biocides □ Antifoams □ Coagulants □ Corrosion/scale inhibitors □ Disinfectants □ Flocculants □ Neutralizing agents □ Oxidants □ Oxygen □ scavengers □ pH conditioners □ Bioremedial agents, including microbes □ Chlorine or chemicals containing chlorine □ Other; if so, specify:

2. Provide the following information for each chemical/additive, using attachments, if necessary:

a. Product name, chemical formula, and manufacturer of the chemical/additive; b. Purpose or use of the chemical/additive or remedial agent; c. Material Safety Data Sheet (MSDS) and Chemical Abstracts Service (CAS) Registry number for each chemical/additive; d. The frequency (hourly, daily, etc.), duration (hours, days), quantity (maximum and average), and method of application for the chemical/additive; e. Any material compatibility risks for storage and/or use including the control measures used to minimize such risks; and f. If available, the vendor's reported aquatic toxicity (NOAEL and/or LC50 in percent for aquatic organism(s)).

3. Has the operator attached an explanation which demonstrates that the addition of such chemicals/additives may be authorized under this general permit in accordance with the instructions in F, above? (check one): □ Yes □ No; if no, has the operator attached data that demonstrates each of the 126 priority pollutants in CWA Section 307(a) and 40 CFR Part 423.15(j)(1) are non-detect in discharges with the addition of the proposed chemical/additive? (check one): □ Yes □ No

G. Endangered Species Act eligibility determination 1. Indicate under which criterion the discharge(s) is eligible for coverage under this general permit: □ FWS Criterion A: No endangered or threatened species or critical habitat are in proximity to the discharges or related activities or come in contact with the “action area”. □ FWS Criterion B: Formal or informal consultation with the FWS under section 7 of the ESA resulted in either a no jeopardy opinion (formal consultation) or a written concurrence by FWS on a finding that the discharges and related activities are “not likely to adversely affect” listed species or critical habitat (informal consultation). Has the operator completed consultation with FWS? (check one): □ Yes □ No; if no, is consultation underway? (check one): □ Yes □ No □ FWS Criterion C: Using the best scientific and commercial data available, the effect of the discharges and related activities on listed species and critical habitat have been evaluated. Based on those evaluations, a determination is made by EPA, or by the operator and affirmed by EPA, that the discharges and related activities will have “no effect” on any federally threatened or endangered listed species or designated critical habitat under the jurisdiction of the FWS. This determination was made by: (check one) □ the operator □ EPA □ Other; if so, specify: MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 23 of 24

□ NMFS Criterion: A determination made by EPA is affirmed by the operator that the discharges and related activities will have “no effect” or are “not likely to adversely affect” any federally threatened or endangered listed species or critical habitat under the jurisdiction of NMFS and will not result in any take of listed species. Has the operator previously completed consultation with NMFS? (check one): □ Yes □ No 2. Has the operator attached supporting documentation of ESA eligibility in accordance with the instructions in Appendix I, and G, above? (check one): □ Yes □ No per NHESP-2018

Does the supporting documentation include any written concurrence or finding provided by the Services? (check one): □ Yes □ No; if yes, attach.

H. National Historic Preservation Act eligibility determination 1. Indicate under which criterion the discharge(s) is eligible for coverage under this general permit: □ Criterion A: No historic properties are present. The discharges and discharge-related activities (e.g., BMPs) do not have the potential to cause effects on historic properties. □ Criterion B: Historic properties are present. Discharges and discharge related activities do not have the potential to cause effects on historic properties. □ Criterion C: Historic properties are present. The discharges and discharge-related activities have the potential to have an effect or will have an adverse effect on historic properties. 2. Has the operator attached supporting documentation of NHPA eligibility in accordance with the instructions in H, above? (check one): □ Yes □ No

Does the supporting documentation include any written agreement with the State Historic Preservation Officer (SHPO), Tribal Historic Preservation Officer (TPHO), or other tribal representative that outlines measures the operator will carry out to mitigate or prevent any adverse effects on historic properties? (check one): □ Yes □ No

I. Supplemental information Describe any supplemental information being provided with the NOI. Include attachments if required or otherwise necessary.

Has the operator attached data, including any laboratory case narrative and chain of custody used to support the application? (check one): □ Yes □ No Has the operator attached the certification requirement for the Best Management Practices Plan (BMPP)? (check one): □ Yes □ No MAG910000 Appendix IV – Part 1 – NOI NHG910000 Page 24 of 24

J. Certification requirement

I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I have no personal knowledge that the information submitted is other than true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

I certify that a BMPP meeting the requirements of this general permit will be developed and implemented BMPP certification statement: upon initiation of discharge

Notification provided to the appropriate State, including a copy of this NOI, if required. Check one: Yes □ No □

Notification provided to the municipality in which the discharge is located, including a copy of this NOI, if requested. Check one: Yes □ No □

Notification provided to the owner of a private or municipal storm sewer system, if such system is used for site Check one: Yes □ No □ NA □ discharges, including a copy of this NOI, if requested. Permission obtained from the owner of a private or municipal storm sewer system, if such system is used for site discharges. If yes, attach additional conditions. If no, attach explanation and timeframe for obtaining permission. Check one: Yes □ No □ NA □ Notification provided to the owner/operator of the area associated with activities covered by an additional discharge permit(s). Additional discharge permit is (check one): □ RGP □ DGP □ CGP □ MSGP □ Individual NPDES permit Check one: Yes □ No □ NA □ □ Other; if so, specify:

Signature: Date: December 20, 2019

Print Name and Title: Mark A. Germano, LSP ATTACHMENT B FIGURES N

Site

RTN 3-2770 FIGURE 1 395 ALEWIFE BROOK PARKWAY MAG SOMERVILLE, MASSACHUSETTS SITE LOCUS ENVIRONMENTAL & LSP SERVICES N

RETAINING WALL

PROPOSED SOIL STOCKPILE LOCATION FRAC TANK

TWO 500 LB EFFLUENT GAC VESSELS WRAPPED IN HEAT TAPE &

ESTIMATED AREA OF INFLUENT INSULATION RAM EXCAVATION (OR IN HEATED TRAILER)

SMH PLASTIC SECURITY FENCE SECURITY PLASTIC

PLASTIC SECURITY FENCE

SUBMERSIBLE OR SUCTJION PUMP

ALEWIFE BROOK PARKWAY

SMH

EFFLUENT

CB (to Alewife Brook)

ESTIMATED AREA OF GORDON STREET RAM EXCAVATION

RTN 3-2770 FIGURE 2 MAG 395 ALEWIFE BROOK PARKWAY ENVIRONMENTAL & LSP SERVICES SOMERVILLE, MASSACHUSETTS SITE PLAN

20,000-GALLON FRAC TANK EFFLUENT

BAG FILTER

INFLUENT

TWO 500 LB GAC VESSELS WRAPPED IN HEAT TAPE & INSULATION

EXCAVATION EFFLUENT

CATCH BASIN CITY OF SOMERVILLE DRAINAGE SYSTEM

ALEWIFE BROOK

RTN 3-2770 FIGURE 3 MAG 395 ALEWIFE BROOK PARKWAY GROUNDWATER TREATMENT ENVIRONMENTAL & LSP SERVICES SOMERVILLE, MASSACHUSETTS SYSTEM FLOW CHART N

Site

Drainage Outfall

RTN 3-2770 FIGURE 4 MAG 395 ALEWIFE BROOK PARKWAY ENVIRONMENTAL & LSP SERVICES SOMERVILLE, MASSACHUSETTS DRAINAGE PLAN

ATTACHMENT C LABORATORY ANALYTICAL REPORTS

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Page 26 of 28 Page 27 of 28

MassDEP Analytical Protocol Certification Form

Laboratory Name: New England Testing Laboratory, Inc. Project #:

Project Location: 395 Alewife Brook Parkway RTN: This Form provides certifications for the following data set: list Laboratory Sample ID Number(s): 9K08006

Matrices: | Groundwater/Surface Water | Soil/Sediment £ Drinking Water £ Air £ Other: CAM Protocol (check all that apply below): MassDEP VPH 9014 Total 8260 VOC 7470/7471 Hg (GC/PID/FID) 8082 PCB Cyanide/PAC 6860 Perchlorate CAM II A | CAM III B | CAM IV A | CAM V A £ CAM VI A £ CAM VIII B £ MassDEP VPH 8270 SVOC 7010 Metals (GC/MS) 8081 Pesticides 7196 Hex Cr MassDEP APH CAM II B £ CAM III C £ CAM IV C £ CAM V B £ CAM VI B £ CAM IX A £

6010 Metals 6020 Metals MassDEP EPH 8151 Herbicides 8330 Explosives TO-15 VOC CAM III A | CAM III D £ CAM IV B | CAM V C £ CAM VIII A £ CAM IX B £ Affirmative Responses to Questions A through F are required for “Presumptive Certainty” status Were all samples received in a condition consistent with those described on the Chain-of- A Custody, properly preserved (including temperature) in the field or laboratory, and | Yes £ No prepared/analyzed within method holding times? Were the analytical method(s) and all associated QC requirements specified in the selected B | Yes £ No CAM protocol(s) followed? Were all required corrective actions and analytical response actions specified in the selected C | Yes £ No CAM protocol(s) implemented for all identified performance standard non-conformances?

Does the laboratory report comply with all the reporting requirements specified in CAM VII A, D “Quality Assurance and Quality Control Guidelines for the Acquisition and Reporting of | Yes £ No Analytical Data”? VPH, EPH, APH, and TO-15 only | Yes £ No a. VPH, EPH, and APH Methods only: Was each method conducted without significant E modification(s)? (Refer to the individual method(s) for a list of significant modifications). £ Yes £ No b. APH and TO-15 Methods only: Was the complete analyte list reported for each method? Were all applicable CAM protocol QC and performance standard non-conformances identified F | Yes £ No and evaluated in a laboratory narrative (including all “No” responses to Questions A through E)? Responses to Questions G, H and I below are required for “Presumptive Certainty” status

Were the reporting limits at or below all CAM reporting limits specified in the selected CAM 1 | Yes £ No G protocol(s)? Data User Note: Data that achieve “Presumptive Certainty” status may not necessarily meet the data usability and representativeness requirements described in 310 CMR 40. 1056 (2)(k) and WSC-07-350. H Were all QC performance standards specified in the CAM protocol(s) achieved? | Yes £ No1 I Were results reported for the complete analyte list specified in the selected CAM protocol(s)? | Yes £ No1

1All negative responses must be addressed in an attached laboratory narrative. I, the undersigned, attest under the pains and penalties of perjury that, based upon my personal inquiry of those responsible for obtaining the information, the material contained in this analytical report is, to the best of my knowledge and belief, is accurate and complete.

Signature:______Position:______Laboratory Director______

Printed Name:______Richard Warila______Date:______11/14/2019 ______Page 28 of 28 [T !"#$!%&'()*'++'([

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Page 12 of 14 Page 13 of 14 MP assDE Analytical Protocol Certification Form

Laboratory Name: New England Testing Laboratory, Inc. Project #:

Project Location: Alewife Brook Parkway RTN: This Form provides certifications for the following data set: list Laboratory Sample ID Number(s): 9K27055

M atrices: | Groundwater/Surface Water | Soil/Sediment £ Drinking Water £ Air £ Other: CAM Protocol (check all that apply below): MassDEP VPH 9014 Total 8260 VOC 7470/7471 Hg (GC/PID/FID) 8082 PCB Cyanide/PAC 6860 Perchlorate CAM II A £ CAM III B £ CAM IV A | CAM V A £ CAM VI A £ CAM VIII B £ MassDEP VPH 8270V S OC 7010 Metals (GC/MS) 8081 Pesticides 7196 Hex Cr MassDEP APH CAM II B £ CAM III C £ CAM IV C £ CAM V B £ CAM VI B £ CAM IX A £

6010 Metals 6020 Metals MassDEP EPH 8151 Herbicides 8330 Explosives TO-15 VOC CAM III A £ CAM III D £ CAM IV B £ CAM V C £ CAM VIII A £ CAM IX B £ Ae ffirmativ Responses to Questions A through F are required for “Presumptive Certainty” status Were all samples received in a condition consistent with those described on the Chain-of- A Custody, properly preserved (including temperature) in the field or laboratory, and | Yes £ No prepared/analyzed within method holding times? Were the analytical method(s) and all associated QC requirements specified in the selected B | Yes £ No CAM protocol(s) followed? Were all required corrective actions and analytical response actions specified in the selected C | Yes £ No CAM protocol(s) implemented for all identified performance standard non-conformances?

Does the laboratory report comply with all the reporting requirements specified in CAM VII A, D “Quality Assurance and Quality Control Guidelines for the Acquisition and Reporting of | Yes £ No Analytical Data”? VPH, EPH, APH, and TO-15 only | Yes £ No a. VPH, EPH, and APH Methods only: Was each method conducted without significant E modification(s)? (Refer to the individual method(s) for a list of significant modifications). £ Yes £ No b. APH and TO-15 Methods only: Was the complete analyte list reported for each method? Were all applicable CAM protocol QC and performance standard non-conformances identified F | Yes £ No and evaluated in a laboratory narrative (including all “No” responses to Questions A through E)? Responses to Questions G, H and I below are required for “Presumptive Certainty” status Were the reporting limits at or below all CAM reporting limits specified in the selected CAM | Yes £ No1 G protocol(s)? Data User Note: Data that achieve “Presumptive Certainty” status may not necessarily meet the data usability and representativeness requirements described in 310 CMR 40. 1056 (2)(k) and WSC-07-350. H Were all QC performance standards specified in the CAM protocol(s) achieved? | Yes £ No1 I Were results reported for the complete analyte list specified in the selected CAM protocol(s)? | Yes £ No1 1All negative responses must be addressed in an attached laboratory narrative. I,d the un ersigned, attest under the pains and penalties of perjury that, based upon my personal inquiry of those responsible for obtaining the information, the material contained in this analytical report is, to the best of my knowledge and belief, is accurate and complete.

Signature:______Position:______Laboratory Director

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Page 31 of 32 Page 32 of 32

ATTACHMENT D MASSACHUSETTS CULTURAL RESOURCES

ATTACHMENT E STREAM STATISTICS/DILUTION FACTOR CONFIRMATION StreamStats https://streamstats.usgs.gov/ss/

Region ID: MA Workspace ID: MA20200123195035632000 Clicked Point (Latitude, Longitude): 42.41383, -71.13255 Time: 2020-01-23 14:50:51 -0500

Basin Characteristics

Parameter Code Parameter Description Value Unit

DRNAREA Area that drains to a point on a stream 8.84 square miles

BSLDEM250 Mean basin slope computed from 1:250K DEM 1.614 percent

DRFTPERSTR Area of stratified drift per unit of stream length 0.53 square mile per mile

MAREGION Region of Massachusetts 0 for Eastern 1 for 0 dimensionless Western

1 of 3 1/23/2020, 2:52 PM StreamStats https://streamstats.usgs.gov/ss/

Low-Flow Statistics Parameters[Statewide Low Flow WRIR00 4135]

Parameter Min Max Code Parameter Name Value Units Limit Limit

DRNAREA Drainage Area 8.84 square miles 1.61 149

BSLDEM250 Mean Basin Slope from 250K 1.614 percent 0.32 24.6 DEM

DRFTPERSTR Stratified Drift per Stream 0.53 square mile per 01.29 Length mile

MAREGION Massachusetts Region 0 dimensionless 0 1

Low-Flow Statistics Flow Report[Statewide Low Flow WRIR00 4135]

PIl: Prediction Interval-Lower, PIu: Prediction Interval-Upper, SEp: Standard Error of Prediction, SE: Standard Error (other -- see report) Statistic Value Unit PIl PIu SE SEp

7 Day 2 Year Low Flow 1.56 ft^3/s 0.449 5.19 49.5 49.5

7 Day 10 Year Low Flow 0.759 ft^3/s 0.176 3.06 70.8 70.8

Low-Flow Statistics Citations

Ries, K.G., III,2000, Methods for estimating low-flow statistics for Massachusetts streams: U.S. Geological Survey Water Resources Investigations Report 00-4135, 81 p. (http://pubs.usgs.gov/wri/wri004135/)

2 of 3 1/23/2020, 2:52 PM StreamStats https://streamstats.usgs.gov/ss/

3 of 3 1/23/2020, 2:52 PM From: Vakalopoulos, Catherine (DEP) To: "[email protected]" Subject: RE: RGP-Dilution Factor Date: Thursday, January 23, 2020 4:36:26 PM

Hi Mark, Yes, as we discussed over the phone today, I can confirm that the dilution factor (14.64) for the proposed dewatering discharge with a design flow of 25 gpm from 395 Alewife Brook Parkway in Somerville directly to Alewife Brook (southwest of the rotary) is correct. Please note that the 7Q10 is 0.759 cfs which equals 0.491 mgd.

To assist you with the NOI in case you have not filled this part out: this segment of Alewife Brook is identified as MA71-04, is classified as class B, is not an Outstanding Resource Water, and there are no approved TMDLs for this segment. As we also discussed, the $500 MassDEP WM15 fee is not required because this is a current MCP site.

Please let me know if you have any additional questions.

Cathy

Cathy Vakalopoulos, Massachusetts Department of Environmental Protection 1 Winter St., Boston, MA 02108, 617-348-4026 P Please consider the environment before printing this e-mail

From: [email protected] [mailto:[email protected]] Sent: Thursday, January 23, 2020 3:38 PM To: Vakalopoulos, Catherine (DEP) Subject: RGP-Dilution Factor

Hi Catherine, Pursuant to our conversation today. I am preparing a NOI for a RGP for 395 Alewife Brook Parkway Somerville, MA RTN 3-2770. Using Stream Stats we determined The 7Q10 to be 0.759 mgd. The treatment system maximum flow is 25 gpm. We calculated the Dilution Factor to be 14.64. Please confirm. Mark

Mark A. Germano, LSP 781-837-1949 office 339-793-3528 cell