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Fourth aWrwr IN3 amunawmaw IforiftNtm Rogan <br /> 900 SOUlh Cherolmo Lona LOCA,CWftmn <br /> i <br /> GROUNDWATER SAMPLING AND ANALYSES <br /> Aegis personnel collected groundwater samples from nine of the wells All other wells <br /> were considered dry The samples were analyzed for concentrations of <br /> a Total petroleum hydrocarbons, as gasoline, by EPA Method 8015, <br /> 4 Benzene, toluene, ethylbenzene, and total xylenes by EPA Method 602 <br /> Analytical results from March 1992 to date are summarized in Table 2 The analytical <br /> laboratory report and chain-of-custody forms for the current sampling event are attached <br /> Previous analytical results are included in the Attachments Benzene concentrations <br /> remain nondetectable in wells MW-6 MW-18 and RW-1 Concentrations increased to <br /> well MW-27 compared to the prior sampling 'Neils MW-16, MW-21, MW-24, and MW-25 <br /> were not sampled last event, but all had nondetectable benzene concentrations this <br /> event Well MW-8 had a benzene concentration of 32 ppb <br /> Aegis recommends a copy of this quarterly monitoring report be forwarded to the following <br /> parties <br /> Ms Linda Turkette <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> Post Office Box 2009 <br /> Stockton California 95201 <br /> Mr Gordon Boggs <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road Suite A <br /> Sacramento California 95827-3098 <br /> 92 733F RPT 2 <br />