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C A M B R I A <br /> , � f <br /> 00 JUL 21 P,412 3 I <br /> July 19, 2000 <br /> Ms Lori Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report — Second Quarter 2000 <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> SAP Code 13 613 9 <br /> Incident No 98996180 <br /> SJCPHS Site Code 1660 <br /> Dear Ms Duncan <br /> This report describes the recently completed activities associated with groundwater <br /> monitoring and sampling at the referenced site (Figures 1 and 2) This report was prepared to <br /> meet reporting requirements issued by the Regional Water Quality Control Board, Central <br /> Valley Region and the San Joaquin County Public Health Services Environmental Health <br /> . Division (SJCPHS/EHD) <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for this quarter is summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels and collected groundwater samples from wells MW-1 through MW-3 on <br /> May 18, 2000 Samples were transported to Sequoia Analytical in Morgan Hill, <br /> California for chemical analyses <br /> + Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour/chemical concentration map <br /> Oakland CA <br /> San Ramon, CA (Figure 2) Groundwater flows to the southwest at an approximate hydraulic gradient <br /> Sonoma CA of 003 <br /> Portland, OR <br /> None of the groundwater samples collected during this sampling event contained <br /> Cambria <br /> Environmental detectable levels of TPHg Benzene was detected in well MW-1 at a concentration of <br /> Technology,Inc 0 551 ppb MTBE (by EPA Method 8020) was reported in well MW-3 at a <br /> concentration of 43 0 ppb and was detected by EPA Method 8260E at a <br /> 0 Perkins Street <br /> Box 259 concentration of 32 8 ppb <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />