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i <br /> CAMBRIA <br /> 11 56 <br /> April 19, 2000 <br /> Ms Lori Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groudnwater Monitoring Report — First Quarter 2000 <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> SAP Code 136139 <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 in and collected groundwater samples from wells MW-1 through MW-3 on <br /> February 2, 2000 Samples were transported to Sequoia Analytical in Petaluma, <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 generally to the south at an approximate hydraulic <br /> Sonoma CA gradient of 0 02 <br /> Portland OR <br /> • None of the groundwater samples collected during this sampling event contained <br /> Cambria <br /> Environmental detectable levels of TPHg or benzene MTBE was detected only in well MW-3 at a <br /> Technology,Inc concentration of 32 7 ppb (by EPA Method 8020) and was confirmed by EPA <br /> Method 8260B at a concentration of 36 7 ppb <br /> Perkms Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />