Hess Petroleum Retail Station #21502, 287 Prospect Street
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June 25, 2012 United States Environmental Protection Agency RGP – NOI Processing 1 Congress Street Boston, Massachusetts 02114-2023 Re: Remediation General Permit – Notice of Intent Hess-branded Retail Petroleum Station #21502 287 Prospect Street Cambridge, Massachusetts 02139-1312 MassDEP RTN 3-25183 To Whom It May Concern: At the request of Hess Corporation (Hess), EnviroTrac Ltd (EnviroTrac) is submitting the attached Remediation General Permit (RGP) – Notice of Intent (NOI) for the above-referenced location, referred to as the Site. The RGP-NOI form is included as Attachment A. The Site is a Hess-branded petroleum retail station. Temporary construction dewatering will be required to facilitate the removal of three existing 10,000-gallon capacity, single-wall steel gasoline underground storage tanks (USTs) and the installation of two 20,000-gallon double-walled fiberglass reinforced plastic gasoline USTs. Based on gauging of a monitoring well at the Site, the depth to groundwater is approximately six feet below ground surface (bgs). Excavation to approximately 16 to 17 feet bgs will be required for the UST installation. The location of the Site is depicted on the Site Locus Map (Figure 1). Also attached is a Discharge Location Plan (Figure 2), which depicts existing Site features, the catch basin which represents the proposed discharge point, and the location of the discharge receiving water in relation to the Site. During construction dewatering, groundwater will be pumped from the excavation into a weir- style roll off, a fractionation tank for settlement, then treated through two bag filters (arranged in series) and two 3,000-pound liquid phase carbon units (arranged in series) followed by cartridge filters as a final process to remove suspended sediments. A schematic of the proposed treatment system is included as Figure 3. The treated effluent will be discharged via the catch basin located within the Site property, which discharges to an outfall at the Charles River, approximately 6,850 feet southeast of the Site. The design flow of the treatment system is 200 gallons per minute (gpm), and the average discharge rate of treated groundwater is anticipated to be 150 gpm. On December 13, 2011 and February 22, 2012, groundwater samples were obtained from a tank pad well (TP-1) in the proposed excavation area. Based on analytical data, total petroleum hydrocarbons, metals, chloride, chromium(III), and total suspended solids (TSS) were detected in groundwater. Concentrations of copper, chromium(III), and TSS exceeded the applicable Effluent Limitations listed in Appendix III of the RGP under the National Pollutant Discharge Elimination System for Discharges in Massachusetts. A dilution factor of 33 was calculated for NPDES RGP Notice of Intent June 25, 2012 Hess Station #21502, 287 Prospect Street, Cambridge, MA FIGURES SITE 0.5 0.25 0 0.5 1 Miles Scale: 1:24,000 Hess Station #21502 FIGURE 1 UTM Coordinates: 287 Prospect Street 4,693,260 m North Cambridge, MA 02139-1312 SITE LOCUS MAP 327,180 m East UNITED STATES GEOLOGICAL SURVEY BOSTON NORTH AND BOSTON SOUTH, MA QUADRANGLES Latitude/Longitude: 42° 22' 22" North µ Contour Interval: 3 m 71° 05' 55" West City of Cambridge May 7, 2012 Gravity Mai Stormwater Sewage Combined Sewage Abandoned Zoom Three Paved Surfaces Paved Roads Paved Parking Bridges Public Footpath City of Cambridge Massachusetts 1" = 202 ft All data is provided for graphic representation only. The City of Cambridge expressly disclaims all warranties of any type, expressed or implied, including, but not limited to, any warranty as to the accuracy of the data, merchantability, or fitness for a particular purpose. City of Cambridge May 7, 2012 Gravity Mai Stormwater Sewage Combined Sewage Abandoned Zoom Three Paved Surfaces Paved Roads Paved Parking Bridges Public Footpath City of Cambridge Massachusetts 1" = 202 ft All data is provided for graphic representation only. The City of Cambridge expressly disclaims all warranties of any type, expressed or implied, including, but not limited to, any warranty as to the accuracy of the data, merchantability, or fitness for a particular purpose. City of Cambridge May 7, 2012 Gravity Mai Stormwater Sewage Combined Sewage Abandoned Zoom Three Paved Surfaces Paved Roads Paved Parking Bridges Public Footpath City of Cambridge Massachusetts 1" = 202 ft All data is provided for graphic representation only. The City of Cambridge expressly disclaims all warranties of any type, expressed or implied, including, but not limited to, any warranty as to the accuracy of the data, merchantability, or fitness for a particular purpose. City of Cambridge May 7, 2012 Gravity Mai Stormwater Sewage Combined Sewage Abandoned Zoom Three Paved Surfaces Paved Roads Paved Parking Bridges Public Footpath City of Cambridge Massachusetts 1" = 202 ft All data is provided for graphic representation only. The City of Cambridge expressly disclaims all warranties of any type, expressed or implied, including, but not limited to, any warranty as to the accuracy of the data, merchantability, or fitness for a particular purpose. City of Cambridge May 7, 2012 Gravity Mai Stormwater Sewage Combined Sewage Abandoned Zoom Three Paved Surfaces Paved Roads Paved Parking Bridges Public Footpath City of Cambridge Massachusetts 1" = 202 ft All data is provided for graphic representation only. The City of Cambridge expressly disclaims all warranties of any type, expressed or implied, including, but not limited to, any warranty as to the accuracy of the data, merchantability, or fitness for a particular purpose. City of Cambridge May 7, 2012 Gravity Mai Stormwater Sewage Combined Sewage Abandoned Zoom Three Paved Surfaces Paved Roads Paved Parking Bridges Public Footpath City of Cambridge Massachusetts 1" = 202 ft All data is provided for graphic representation only. The City of Cambridge expressly disclaims all warranties of any type, expressed or implied, including, but not limited to, any warranty as to the accuracy of the data, merchantability, or fitness for a particular purpose. City of Cambridge May 7, 2012 Gravity Mai Stormwater Sewage Combined Sewage Abandoned Zoom Three Paved Surfaces Paved Roads Paved Parking Bridges Public Footpath City of Cambridge Massachusetts 1" = 202 ft All data is provided for graphic representation only. The City of Cambridge expressly disclaims all warranties of any type, expressed or implied, including, but not limited to, any warranty as to the accuracy of the data, merchantability, or fitness for a particular purpose. NPDES RGP Notice of Intent June 25, 2012 Hess Station #21502, 287 Prospect Street, Cambridge, MA TABLE TABLE 1 SUMMARY OF GROUNDWATER ANALYTICAL DATA Hess Station #21502 287 Prospect Street Cambridge, Massachusetts Sample ID TP-2 TP-2 (filtered) RGP Appendix III RGP Appendix IV Effluent Limits Sample Date 12/14/2011 2/22/2012 Effluent Limits Dilution Factor Range >10-50 Volatile Organic Compounds (µg/L) Benzene <0.50 -- 5 NA Toluene <1.0 -- NE NA Ethylbenzene <1.0 -- NE NA Xylenes <2.0 -- NE NA Total BTEX ND -- 100 NA Naphthalene <5.0 -- 20 NA n-Butylbenzene <5.0 -- <100 NA sec-Butylbenzene <5.0 -- NE NA Isopropylbenzene <5.0 -- NE NA p-Isopropyltoluene <5.0 -- NE NA Methyl Tert Butyl Ether <1.0 -- 70.0 NA n-Propylbenzene <5.0 -- NE NA tert-Amyl Methyl Ether <2.0 -- NE NA 1,2,4-Trimethylbenzene <5.0 -- NE NA 1,3,5-Trimethylbenzene <5.0 -- NE NA Tert Butyl Alcohol <20 -- NE NA All other VOCs ND -- NE NA Extractable Petroleum Hydrocarbons (µg/L) Fluoranthene 5.70 -- NE NA 1,2-Dibromoethane <0.015 -- 0.05 NA Total Petroleum Hydrocarbons (mg/L) TPH-GRO <0.10 -- 5.0 NA TPH-DRO 0.265 -- 5.0 NA Polychlorinated Biphenyls (µg/L) Aroclor 1016 <0.29 -- 0.000064 NA Aroclor 1221 <0.29 -- 0.000064 NA Aroclor 1232 <0.29 -- 0.000064 NA Aroclor 1242 <0.29 -- 0.000064 NA Aroclor 1248 <0.29 -- 0.000064 NA Aroclor 1254 <0.29 -- 0.000064 NA Aroclor 1260 <0.29 -- 0.000064 NA Aroclor 1262 <0.29 -- 0.000064 NA Aroclor 1268 <0.29 -- 0.000064 NA Total Metals (µg/L) Antimony <6.0 -- 5.6 NA Arsenic 42.4 -- 10 540 Cadmium <4.0 -- 0.2 NA Chromium 55.9 -- NE NA Chromium, Hexavalent <10 -- 11.4 NA Chromium, Trivalent 51 -- 48.8 170 Copper 280 -- 3.7 52 Iron 32,300 <100 1,000 5,000 Lead 316 <5 1.3 13 Mercury 0.33 -- 0.9 2.3 Nickel 65 -- 8.2 290 Selenium <10 -- 5 NA Silver <5.0 -- 1.2 NA Zinc 969 <20 66.6 666 General Chemistry (mg/L) Chloride 145 -- NE NA Total Suspended Solids 237 -- 30 NA Total Residual Chlorine <0.05 -- 0.0075 NA NOTES: RGP is Remediation General Permit TPH-GRO is total petroleum hydrocarbons gasoline range organics mg/L is milligrams per liter µg/L is micrograms per liter < Indicates that the compound was not detected at the laboratory detection limit listed ND is not detected NE is not established NA is not applicable BOLD indicates concentrations greater than RGP Appendix III effluent limits RED indicates concentrations greater than RGP Appendix IV effluent limits A Dilution Facotr of 33 was calculated based on the following equation: (Maximum Flow Rate of Discharge + 7Q10 of receiving water)/Maximum Flow Rate of Discharge =(0.446 cfs + 14.3 cfs) / 0.446 cfs = 33 where cfs is cubic feet per second For all metals which exceeded RGP Appendix III effluent limits, the Dilution Factor was used to determine the RGP Appendix IV effluent limits Page 1 of 1 NPDES RGP Notice of Intent June 25, 2012 Hess Station #21502, 287 Prospect Street, Cambridge, MA ATTACHMENT A NPDES RGP Notice of Intent June 25, 2012 Hess Station #21502, 287 Prospect Street, Cambridge, MA Remediation General