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.s r <br /> C A M B R I A r r � Y ' <br /> �` 41l1 <br /> 127l� 5 <br /> January 24, 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 Quarterly Monitoring Report — Fourth Quarter 1999 <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> SAP Code 136139 <br /> Incident No 98996180 <br /> Dear Ms Duncan <br /> This report describes the recently completed activities associated with groundwater <br /> monitoring and sampling at the referenced site (Figures I 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 samples from wells MW-1 through MW-3 on November 9, 1999 <br /> Samples were transported to Sequoia Analytical in Morgan Hill, California for <br /> chemical analyses <br /> 0 Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour/chemical concentration map <br /> Oakland CA (Figure 2) Groundwater flow direction Is northwesterly at an approximate hydraulic <br /> Sonoma CA gradient of 0 003 <br /> Portland OR <br /> S e a t t I e WA 0 None of the groundwater samples contained detectable levels of TPHg Benzene was <br /> Cambna detected only In well MW-2 at a concentration of 0 505 ppb, and MTBE was <br /> Environmental detected only In well MW-3 at a concentration of 47 5 ppb <br /> Technology,Inc <br /> 0 Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4650 <br /> Fax(707)935-6649 <br />