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5) Soil borings installed to determine the lateral extent of soil contamination <br /> should be positioned laterally based on soil data from the well positioned 10 <br /> feet downgradient of the former UST location. <br /> 6) Soil borings used to determine the lateral extent of soil contamination should <br /> be completed as vapor extraction wells if terminated above groundwater or as <br /> groundwater monitoring wells if terminated below groundwater. <br /> 7) At least one soil boring located in the center of the release site should be <br /> advanced to a depth which will produce a soil sample indicating the vertical <br /> extent of soil contamination below groundwater. Once the data is obtained this <br /> boring should be completed as an air sparge well. <br /> 8) Soil and groundwater samples should be submitted for ether and alcohol <br /> analysis using EPA method 8260. Specifically Methanol, Ethanol, Tertiary <br /> Butanol, MTBE, Di-isopropyl ether (DIPE), Ethyl Tertiary Butyl Ether (ETRE), <br /> and Tertiary Amyl Methyl Ether (TAME). Results of these analyses must be <br /> reported at method detection limits in order to confirm the presence or <br /> absence of these petroleum constituents. <br /> 9) PHS/EHD recommends that the well casings have a 2 inch outside diameter <br /> and the well completion be a flush mount rather than a "steel riser casing". <br /> Please contact Steven Sasson, Senior REHS, at (209) 468-3459 if you need <br /> additional information. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> r� <br /> Steven Sasson, Senior REHS Marga�o, 'R rS <br /> Site Mitigation Unit Supervisor <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Mel Jacobo, SWRCB <br /> cc: Bill Fox, WHF <br />