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5 <br /> CAMRIA JUL 102003 <br /> 1 Ei','T HEALTH <br /> Pf ri Ji �;jyE�tiC1t9 , <br /> Ms. Margaret Lagorio r <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton,California 95202 <br /> Re: Groundwater Monitoring Report - Second Quarter 2003- <br /> Shell-branded Service Station <br /> 341 East Main Street ' } j <br /> Ripon,California <br /> SAP Code 135816 <br /> Incident No. 98995874 <br /> SJCEHD Site Code: 506186 <br /> Dear Ms. Lagorio: <br /> Cambria Environmental Technology, Inc. (Cambria) is submitting this groundwater monitoring <br /> report on behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell) in accordance <br /> with the quarterly reporting requirements of 23 CCR 2652d. <br /> SECOND QUARTER 2003 ACTIVITIES <br /> Groundwater Monitoring: Blaine Tech Services, Inc. (Blaine) of San Jose, California gauged <br /> and sampled all wells, and prepared a summary table of field gauging data and petroleum <br /> hydrocarbon and methyl tertiary butyl ether (MTBE) concentrations. Cambria prepared an area <br /> well survey map (Figure 1), a groundwater elevation/chemical concentration map for the deep <br /> zone (Figure 2), and a groundwater contour/chemical concentration map for the shallow zone <br /> (Figure 3). A groundwater contour map was not constructed this quarter for the deep zone <br /> (Figure 2) because groundwater levels measured in the deep wells were at the same elevation. <br /> Blaine's report, presenting the second quarter 2003 laboratory report, supporting field notes,and <br /> the fust quarter 2003 monthly sampling results for well MW-6A,;is inctuded as Appendix A. <br /> o a k I a n d. CA During the review of this quarter's monitoring data, we discovered an elevation survey error for J. <br /> Sonoma, CA well MW-3. We had the surveyor fix the error and reissue hj$isurvey report (included -as <br /> Portland, OR <br /> Seattle. WA Appendix B). This error means that groundwater contour. maps prepared for the shallow <br /> groundwater zone prepared for the third quarter 2002-through the first quarter of 2003:are not <br /> i <br /> Cambria accurate representations of the groundwater flow beneath the site. In addition, the:rose diagrams j <br /> ``'"`'""""""" on those contour maps are also inaccurate. We have deleted,the erroneous data from the rose <br /> Technology,inc. <br /> diagram prepared for this quarter. <br /> '*prkns street <br /> P.o.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />