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Frst Quarter 1993 Grourx water MonitodN Report <br /> 2185 Fremont Street,Stockton,Cafdornia <br /> �-' GROUNDWATER SAMPLING AND ANALYSES <br /> Aegis personnel collected groundwater samples from the five wells on February 4, 1993. <br /> The samples were collected according to th�Aegis SOP included in Attachment 1, and <br /> submitted under chain-of-custody to WEST Labs, a state-certified analytical laboratory. <br /> All samples were analyzed for concentrations of, a) total petroleum hydrocarbons, as <br /> gasoline, by modified EPA Method 016', and b) benzene, toluene, ethylbenzene, and <br /> total xylenes by EPA Method 60V The samples from MW and MW-5 were also <br /> analyzed for halogenated volatile organics by EPA Method 60�The samples from MW-1 <br /> and MW-4 were also analyzed for fecal coliform by Colilert (MMO-MUC?) Method at AnLab <br /> Analytical Laboratories of Sacramento, California. Please refer to the analytical reports <br /> for these additional results. Current analytical results for EPA Methods 8015 and 602, and <br /> prior 1992 analytical results only, are summarized in Table 2. Figure 3 is a distribution <br /> map of benzene in groundwater based on the data summarized in Table 2. The analytical <br /> laboratory reports and chain-of-custody form are included as Attachment 2. Previous / <br /> analytical results are incl7creased <br /> d in Attachment 4. Benzene concentrations have decrease <br /> in MW-2 and MW-3, but in MW-1 compared to the October 1992 event. <br /> Aegis recommends a copy of this quarterly monitoring report be forwarded to the <br /> following parties: <br /> Mr. Mike Infurna <br /> Environmental Health Department <br /> County of San Joaquin <br /> 445 North San Joaquin Road <br /> Stockton, California 95201 <br /> Mr. Gordon Boggs <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 92.7908.RPT -2- <br />