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Brown and Caldwell <br /> Cc�'lSUltar,i5 <br /> - •ilY,l JdSgi?3 ry 1991 <br /> IUi�'.Ul,liJ�iJT •�. PEAl:�'r! <br /> August <br /> Mr. Kyle Christie <br /> ARCO Products Company <br /> Post Office Sox 5811 017-5380-0311 <br /> San Mateo,California 94402 <br /> Subject: (quarterly Report for ARCO Station 434, 501 Kettletnan Lane, <br /> Lodi, California: Site Code 1341 <br /> Dear Mr. Christie: <br /> Presents water levels and analytical results of groundwater sampling performed at <br /> This report p (ARCO) Station 434, located at 501 Kettleman Lane in Lodi. <br /> ,a RCO Products Company ( I A,W-2' <br /> California on April 16, 17, and 18, 1991. Tltere are six on-site monitoring i W 5, W-6-7, W-8, <br /> W-2A,W-2B, W-3, acrd W-9) and eight off-site monitoring wells OV-4, <br /> W-10,W-11, and W-12)(Figure 1). All monitoring wells were sampled except W-2A and W-4, <br /> due to lack of water and slow recharge in these wells. <br /> Meld and Analytical Methods <br /> Brown and Caldwell personnel measured depth-to-water levels, oversaw Purl;$ of each well, <br /> pies at the site. Refer to Exhibit A for detail <br /> and collected groundwater samed field methods <br /> description. <br /> les were analyzed for total petroleum hydrocarbons (TPH) ani! benzene' <br /> All groundwater same (EPA) <br /> ethylbenzene, toluene, and xylenes (BMX)X) by U.S. Environmental Protection Agency <br /> Methods 5030/mod�ed 8015/8020. <br /> Results <br /> n is to the south. The hydraulic grads:nt is approximately 0.402• <br /> The groundwater flow directio <br /> the water-level elevations and Table 2 presents the last and present hydraulic <br /> Table I presents <br /> gradients and directions for the subject site. <br /> 4les are summarized in Table 3, along with previous <br /> Analytical results of groundwater same ling j is presented in Exhibit B. <br /> results. The complete laboratory report for the April 1991 same <br /> • _ Figure 2 shows BETX concentrations. <br />