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j41':Y <br /> III <br /> �;C''BiN61 alt❑ jpialilW�li <br /> FFF4 I x <br /> December 23, 1991 0 PC 2 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> Post Office Box 5811 017-4986-2111 <br /> San IvIateo, California 94402 <br /> Subject: Fottrth Quarter 1991 Report for ARCO Station 2093, 3.125 Tracy Boulevard, <br /> Tracy, California: Pilot Program Site 1416 <br /> Dear Mr. Carmel: <br /> d analytical results of groundwater sampling <br /> This report presents quarterly water levels an <br /> performed at ARCO Products Company (ARCO) Station 2093, located at 3425 Tracy <br /> Boulevard in Tracy,California on September 24 and 25, 1991. TR site location off s to map is wells <br /> on Figarre I- There are seven on-site wells (ATR-1 through <br /> all measured and sampled. <br /> (ATR-8 through ATR-12), as shown on Figure 2, that were <br /> Field and Analytical Methods <br /> purging of each <br /> Brown and Caldwell personnel <br /> um les at the sdepth ite.ater Refereto,Exhibitsupervised <br /> Afor detailed fi ld <br /> well, and collected groupdwate sF <br /> methods description. A summary of the groundwater measurements is presented in Table 1. <br /> All groundwater samples were analyzed for <br /> ency(ETA)Method 602�and for total petroleurs <br /> (BETX)by U.S.Environmental Protectoluene, and xylenes; <br /> t G <br /> hydrocarbi.ts as gasolinc (T 14-G)by GC F1D15030. <br /> Results <br /> s measured on September 24, 1991, the general groundwater flow <br /> Based on the water level <br /> direction beneath the station is to hydraulicreddienttdata fromdraulic tprevrious monitoring periods. <br /> (Figure 3). Table 2 Fresenis t <br /> - - - saPrevious <br /> mpling g --- -- <br /> Analytical results of groundwater samplesare <br /> are -'1'abie on will, <br /> results. The complete laboratory ieure 4 presents the September <br /> TPH-G and BETXconcentrations for the <br /> is presented in Exhibit <br /> September 1991 sampling event. Figure 5 presents.a benzene isoconcentration map <br /> . �9,,R00RTSISEP91QTRY-Fr _ <br />