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{ kp <br /> Valley Water Treatment F Page 5 <br /> Work Plan-Monitoring Well Construction <br /> j GPE Project No.480.2 <br /> June 16,2005 <br /> The groundwater samples water samples from each well will be submitted to <br /> Argon Laboratories of Ceres and tested for the presence of benzene, toluene, <br /> ethylbenzene and xylene (BTEX) by EPA meihod `602, gasoline range <br /> petroleum hydrocarbons (TPH-G) using EPA metbiod 8015m, and oxygenated <br /> gasoline additives including MTBE by EPA method 8260. <br /> The detection limits for these analyses are summarized in the following <br /> table. <br /> Benzene Toluene Ethvl- Xylene; TPH-G MTBE <br /> benzene <br /> . MDL 5 5. 5 10 31 1 2 <br /> Units u /L /L /L u /L m /L /L <br /> 5.0 RECEPTOR SURVEY <br /> In order to help determine if human health may Ue at risk as a result of this <br /> release, a survey will be conducted to determine if any water wells exist within a <br /> minimum of 2,000 feet of the point of release. This'will include both a records <br /> search and a physical search for wells. <br />� P Y _ <br /> Records Search <br /> A records search will be conducted in an attempt to identify wells located within <br /> a 2000-foot radius of the point of release. This will lie done by requesting access <br /> to records on file with the State Water Resource Control Board. The relevant <br /> USGS maps for the area will also be reviewed. to rdeter nine if any wells are <br /> identified on them, <br /> A+ <br /> Physical Search <br /> The records search will be supplemented by a physical sea'rch*of assessable areas <br /> in attempt to visually identify any well, which may not be identified in the <br /> records search. In addition, any wells identified from State records will be <br /> further investigated to determine their current status. <br /> 6.0 REPORTING m a{ <br /> The information gathered during this phase of work will be presented in a <br /> report, which will include the results of field data, and sample analyses <br /> 2937 Veneman Ave., #B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)56970295 <br /> i't F <br />