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First OftW 1983 tram6maer Marr mMg Fl win <br /> 2185 Fremont Street,Stockton,Cafor"W <br /> GROUNDWATER SAMPLING AND ANALYSES <br /> Aegis personnel collected groundwater samples from the five wells on April 15, 1993 <br /> Well MW-5 was re-sampled on May 11, 1993 The samples were collected according to <br /> the Aegis SOP included in Attachment 1, and submitted under chain-of-custody to WEST <br /> Labs, a state-certified analytical laboratory All samples were analyzed for concentrations <br /> Of <br /> • Total petroleum hydrocarbons, as gasoline, by modified EPA Method 8015 <br /> • Benzene, toluene, ethylbenzene, and total xylenes by EPA Method 602 <br /> Samples from MW-2 and MW-5 were also analyzed for- <br /> • Halogenated volatile organics by EPA Method 601 <br /> Samples from MW-1 and MW-4 were also analyzed for- <br /> Fecal coliform by Cohlert (MMO-MUG) Method at AnLab Analytical <br /> Laboratories of Sacramento, California <br /> Please refer to the analytical reports for these additional results Analytical results for EPA <br /> Methods 8015 and 602 from February 1992 to date, are summarized in Table 2 <br /> Previous analytical results are included in Attachment 4 Figure 3 is a distribution map <br /> of benzene in groundwater based on April 15, 1993 data The analytical laboratory <br /> reports and chain-of-custody form are included as Attachment 2 In general, benzene <br /> concentrations have increased in MWA, MW-2, and MW-3 and have decreased in MW-4 <br /> and MW-5 compared to the February 1993 event <br /> Aegis recommends a copy of this quarterly monitoring report be forwarded to the <br /> following partes. <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 Router Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 92-7900 RRr 2- <br />