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Fourth Oster 1992 arwWrAdeir MoMtortnp Repot <br /> 2195 Fremont Street,Stockton Calltomia <br /> GROUNDWATER SAMPLING AND ANALYSES <br /> Aegis personnel collected groundwater samples from the three wells on October 29, 1992 <br /> The samples were collected according to the 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 8015, and b) benzene, toluene, ethylbenzene, and <br /> total xylenes by EPA Method 602 The sample from MW-2 was also analyzed for <br /> halogenated volatile organics by EPA 601 The sample from MW-1 was also analyzed for <br /> fecal and total coliform by Method SM 9221 at AnLab Analytical Laboratories of <br /> Sacramento, California. Please refer to the analytical report for these additional results <br /> Current analytical results for EPA Methods 8015 and 602 and prior 1992 analytical results <br /> only are summarized in Table 2 Figure 3 is a distribution map of benzene in groundwater <br /> based on the data summarized in Table 2 The analytical laboratory reports and chain-of- <br /> custody form are included as Attachment 2 Previous analytical results are included in <br /> Attachment 4 Benzene concentrations have increased in MW-3 compared to the <br /> previous quarter <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 790A RFr -2 <br />