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f 2085 E Fremont St <br /> Page 2 of 2 <br /> perforin a physical search of the area to identify any wells . On a map with appropriate <br /> scale show the site, the area within a 2,000 foot radius of the site, and the locations of all <br /> the wells identified within that area. Submit the well address locations as they correlate <br /> to the map and submit any known construction details of the wells (if available). <br /> Evaluate the influence of well pumping with respect to the migration of the <br /> contamination from this site and the potential threat to public and environmental health. <br /> A survey of any other potential conduits should also be conducted. <br /> A Work Plan to further investigate soil and water contamination at this site and a Well <br /> Survey Report should be submitted to PHS/EHD by May 31 , 2000. <br /> Quarterly groundwater monitoring should be initiated at this site as soon as MWs are <br /> installed and continue until otherwise instructed by PHS/EHD . The water from these <br /> MWs should be analyzed for Benzene, Toluene, Ethylbenzene and Xylenes using EPA <br /> Method 8020, Total Petroleum Hydrocarbons (TPH) as gasoline using EPA Method <br /> 8015 . Groundwater samples should also be analyzed for Ethyl Tertiary Butyl Ether, <br /> Tertiary Butyl Alcohol, Methyl Tertiary Butyl Ether, Di-isopropyl ether and Tertiary <br /> Amyl Methyl Ether using EPA Method 8260. Some laboratories can run a complete suite <br /> of petroleum constituents and fuel additives using EPA Method 8260B , thereby saving <br /> considerable cost. Quarterly monitoring should continue until further direction from <br /> PHS/EHD. <br /> Please contact Carol Oz, Senior REHS at (209) 468-3440 if you have questions regarding <br /> this letter. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Carolz�r REHS Margar Lagori <br /> Site Mitigation Unit IV Supervisor <br /> cc: MartyHartzell-CVRWQCB <br /> Jason Cashman-WHF <br />