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RE: EP A Remediation General Permit Notice of Intent Former Texaco Station

By Ann Herrick and Hopkinton Ma


and discharge this Notice of Intent (NOl) for ' an EPA Remediation General Pennit (RGP) to treat gasoline-impacted groundwater at the above-referenced site during soil excavation activities and from the discharge of a high vacuum extraction (HVE) system. This work is being conducted as part of Phase IV activities at the site under section 310 CMR 40. 0874 of the Massachusetts Contingency Plan (MCP). Figure 1, Site Locus Map, shows the propert location with respect to surrounding topography. Figure, Site Layout, depicts pertinent site features as well as the proposed soil excavation area. Groundwater will be encountered during the soil excavation at the Site. Once groundwater is encountered during excavation activities, a groundwater recovery sump wil be placed in the excavation. submersible pump wil be placed in the sump to remove groundwater from the excavation and temporarily store the water in a 20 000-gallon frac-tank. Groundwater wil be pumped from the frac tank through an on-site mobile water treatment system. Recovered groundwater wil be treated through two bag filters in parallel and two 1 000-lb. liquid-phase carbon vessels in series. A dewatering schematic is provided in Figure 3. The groundwater treatment system wil be designed to treat and discharge groundwater at a maximum flow rate of 20 gallons per minute (GPM). The flow meter and flow totalizer wil be periodicall

Year: 2009
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