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f <br /> I <br /> First Quarter 1943 Groundwater Mordarirg Report <br /> 35 North Cherokee Lane,Lodi,California <br /> GROUNDWATER SAMPLING AND ANALYSES <br /> Aegis personnel collected groundwater samples from four of the five wells on <br /> February 5, 1993. The samples were collected according to the Aegis SOP included in <br /> Attachment 1, and submitted under chain-of-custody to Resna Labs, a state-certified <br /> analytical laboratory. All samples were analyzed for concentrations of: a) total petroleum <br /> hydrocarbons, as gasoline, by GC-FID/EPA Methods 5030/8015; and b) benzene, <br /> toluene, ethylbenzene, and total xylenes by GC-FID/EPA Methods 5030/602. Current <br /> analytical results, and prior 1992 analytical results only, are summarized in Table 2. The <br /> analytical laboratory reports and chain-of-custody form are included as Attachment 2. <br /> Previous analytical results are included in Attachment 4. Benzene, toluene, ethylbenzene, <br /> and total xylene concentrations have remained below detection limits as compared to the <br /> October 1992 event. <br /> Aegis recommends a copy of this quarterly monitoring report be forwarded to the <br /> following parties: <br /> Mr. Harlan Knoll <br /> San Joaquin County Local Health District <br /> Environmental Health Division <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 /> 92-7916.RP7 -2- <br />