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C A M B R I K <br /> p:. ,,�r r i,V!1�i: <br /> FILE COPY <br /> 03 OCT 22 FM 127 11 <br /> October 20, 2003 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department SAN JOAQUIN COUNTY <br /> 304 East Weber Avenue, Third Floor ENVIRONMENTAL HEALTH DEPARTMENT <br /> Stockton, California 95202 304 E WEBER AVE THIRD FLOOR <br /> STOCKTON CA 95202 <br /> (209)465-3420 <br /> Re: Groundwater Monitoring ReportTWOrpMarter 2003 and, <br /> Analytical Reduction Request <br /> Shell-branded Service Station ❑ Approved with changes: See Remarks <br /> 3011 West Benjamin Holt Drive ❑ Disapproved: See Remarks <br /> ® Stockton, California Remarks — -- _ <br /> SAP Code 136148 <br /> Incident No. 99896188 <br /> SJCEHD Code 1883 Da By <br /> Approvaf extd nds only io thatch is shown ano described <br /> Dear Mr. Infurna: hereon and 9nes :not:iuttlori4ptapprove any omissio, :,r <br /> Cambria Environmental Technology, Inc. (Cambria) prepared this report on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly reporting <br /> requirements of 23 CCR 2652d. <br /> THIRD QUARTER 2003 ACTIVITIES <br /> Blaine Tech Services,Inc. (Blaine) of San Jose, California gauged and sampled all site wells and <br /> prepared a summary table of field gauging data and petroleum hydrocarbon and methyl tertiary <br /> butyl ether (MTBE) concentrations. Cambria prepared a summary table of additional <br /> groundwater analytical data (Table 1), a site vicinity/well survey map (Figure 1), and a <br /> groundwater contour/chemical concentration map (Figure 2). Blaine's report, presenting the <br /> laboratory report,is included as Appendix A. <br /> The analytical data for this sampling event indicate that current levels of hydrocarbons and <br /> MTBE in the groundwater are within the historical concentration ranges for most of the wells. <br /> Wells MW-1 and MW-5 had slightly higher MTBE levels this quarter. Groundwater flow <br /> Oakland, CA direction is generally to the north, which is typical for this site. <br /> San Ramon, CA <br /> Sonoma, CA <br /> Cambria ANTICIPATED FOURTH QUARTER 2003 ACTIVITIES <br /> Environmental <br /> Technology,Inc. Blaine will gauge and sample the site wells according to the existing sampling schedule and <br /> 270 Perkins Street tabulate the data. Cambria will prepare a groundwater monitoring report. <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> lel(707)935-4850 <br /> Fax(707)935-6649 <br />