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2 Define the lateral extent of impacted groundwater by expanding the groundwater monitoring <br /> well network This should include the installation, development, surveying and sampling of at <br /> least three additional wells Poss:ble locations for the new wells are the sidewalk or Charter <br /> Way center lane south (downgradient) of the site, the motel courtyard north (upgradeint) of the <br /> former UST excavation, and within the Sierra Nevada Street right-of-way west of the site <br /> 3 Monitor and sample groundwater from all monitoring wells on a quarterly basis for at least four <br /> consecutive quarters The groundwater samples should be analyzed for TPH-as-gasoline, <br /> BTEX and MTBE by Modified EPA Methods 8015 and 8020 Since the other oxygenate <br /> compounds are absent, no further testing by EPA 8260 is necessary <br /> 4 Conduct a survey of water wells within a 2,000-foot radius of the site The survey should <br /> include a review of well completion reports at the Department of Water Resources offices in <br /> Sacramento, a review of city and county records, and a reconnaissance walk of the site <br /> vicinity to verify well locations and operating status <br /> 5 Evaluate the risk posed by residual petroleum hydrocarbons on human health and the <br /> environment The risk assessment should be based on analytical data collected to date, the <br /> results of four quarters of groundwater monitoring and sampling, and the findings of the water <br /> well survey <br /> 6 Based on the findings of the risk assessment, request regulatory closure or proceed with the <br /> evaluation of possible remedial alternatives <br /> . 13 <br />