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1 <br /> 3202 Hammer Ln. <br /> Page 2 of 2 <br /> Vapor Well 1 (VW 1) is screened from 7 to 16.5 feet so it may have water in it. If there is <br /> water in this well it should be sampled. Also VW1 must be identified on the site map. <br /> Feasibility tests should be conducted in order to compare at least two different <br /> remediation alternatives for soil and water clean up at this site. <br /> A Work Plan to determine the lateral and vertical extent of contamination and to conduct <br /> feasibility tests to evaluate remediation methods for this site should be submitted to <br /> PHS/EHD by July 1 1999. <br /> Conduct a complete well survey of domestic, municipal, agricultural, industrial and any <br /> other wells within a 2,000 foot radius of this site. Contact the Department of Water <br /> Resources, municipal water suppliers and nearby industries for well information. <br /> E <br /> Perform a physical search of the area to identify any wells. Show the locations of all <br /> wells, submit any known construction details of the wells. Identify all sources of <br /> information in the well survey report and clearly depict each well location as they relate <br /> to the above referenced site. Discuss conclusions regarding public and environmental <br /> health risks as they relate to the pumping.influence of these identified wells and the <br /> migration and potential impact of the contaminantplume. <br /> Continue quarterly sampling of MWs and analyze samples for Benzene,:Toluene, Xylene, <br /> Ethylbenzene, using EPA Method 8020 and Total Petroleum Hydrocarbon as gas using <br /> EPA method 8015m. Also,analyze samples for Methyl Tertiary Butyl Ether, Tertiary <br /> Butyl Alcohol, Ethyl Tertiary Butyl Ether, Di-isopropyl Ether, and Tertiary Amyl Methyl <br /> Ether using EPA Method 8260. Provide PHS/EHD with a rose gradient diagram with the <br /> next Quarterly Monitoring Report. <br /> Contact Carol Oz, Senior REHS at(209)468-3440 if you have further questions regarding <br /> this letter. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division . <br /> Carol Oz, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit IV Supervisor <br /> . cc: Mark List-CVRWQCB <br /> t Douglas Lee-Gettler-Ryan Inc. <br />