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CH2M HILL <br /> 1111 Broadway <br /> P.O.Box 12681 <br /> Oakland,CA <br /> CH2MHILL 94804.2681 <br /> j Tel 510.251.2426 <br /> Fax 510.893.8205 <br /> i <br /> July 15, 1997 <br /> Mr.Richard Fish. <br /> Del Monte Foods <br /> P.Q. Box 9004 <br /> Walnut Creek,CA 94598-2458 <br /> 205 N. Wiget Lane <br /> Walnut Creek,CA 94598 <br /> �. Dear Rich: <br /> Subject: April 1997 quarterly monitoring results for Del Monte's Disco Property <br /> I <br /> I Enclosed please find results of quarterly groundwater monitoring conducted on April 17, <br /> �. 1997 at the Disco property in Stockton,California. The results include water level <br /> measurements and laboratory analytical results.Confirmation samples for this monitoring <br /> event were collected ori June 12, 1997 and analyzed for methyl tert-butyl ether(MTBE) <br /> which is included in the analytical results. Field work was performed by Del Tech of <br /> +` Oakdale, California. <br /> t <br /> The results also include monitoring results from previous quarters;since the quarterly <br /> monitoring program began in 1991.The results are presented as described below. <br /> • Site Map-Figure 1 shows a site map of the Disco property. The Disco property is <br /> f located near the intersection of Myrtle Avenue and Filbert Street.in Stockton,California. <br /> 4 • Groundwater Elevation Data -Water elevation data is summarized in Table 1. Shallow <br /> ( groundwater elevation contours are presented in Figure 2. <br /> • Analytical Results-Analytical results are presented in Tables 2 and 3.Field data sheets, <br /> chain-of-custody and laboratory analysis reports of both April 17 and June 12, 1997 <br /> sampling events are presented as attachments to the results. <br /> Table 2 presents groundwater sample analysis for TPH-gasoline and benzene, <br /> toluene,ethyl benzene,and xylenes(BTEX). <br /> Table 3 presents analytical results for MTBE. <br />