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4 <br /> C A M B R f A <br /> July 22, 1999 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> P O Box 388 <br /> Stockton, California 95201 <br /> o �- <br /> Re Quarterly Monitoring Report — Second Quarter 1999 <br /> Shell-branded Service Station <br /> 2494 Fremont Street <br /> Stockton, California <br /> Incident #98996181 <br /> SAP Code 136141 <br /> Dear Mr Infurna <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> groundwater monitoring and sampling at the referenced site (Plates 1 and 2) This report was <br /> prepared to meet quarterly reporting requirements issued by the Regional Water Quality <br /> Control Board, Central Valley Region and San Joaquin County Public Health Services <br /> (SJCPHS) <br /> • Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for the second quarter of 1999 is summarized below <br /> • Blaine Tech Services, Inc (Blaine), of San Jose, California measured groundwater <br /> levels and collected groundwater samples in Wells S-1 through S-3 on May 25, 1999 <br /> Samples were transported to Sequoia Analytical San Carlos, California for chemical <br /> analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour map (Plate 2) Groundwater <br /> flow direction is to the southeast at an approximate hydraulic gradient of 0 002 <br /> Oakland CA <br /> S o n o m a C A Groundwater samples collected from Wells S-2 and S-3 were ND for TPPH, benzene, <br /> Portland 0R <br /> s e a t t I e w A and MTBE Groundwater samples collected from Well S-1 contained TPPH and <br /> benzene concentrations of 96,300 ppb and 2,070 ppb, respectively MTBE was not <br /> Cambria detected in the groundwater sample from S-1, however the detection limit was <br /> Environmental <br /> Technology,Inc elevated (<1,250 ppb) A chemical concentration map is presented on Plate 2 <br /> *erkins Street <br /> 0 Box 259 Z� CQ1�L S <br /> Sonoma CA 95476 1 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />