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C A M B R I A <br /> April 15, 1999 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> P O BOX 388 <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Report — First Quarter 1999 <br /> Shell-branded Service Station <br /> 2494 Fremont Street <br /> Stockton, California <br /> Incident #98996181 <br /> SAP #136141 <br /> Dear Mr Infurna <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates 1 and 2) This report <br /> was 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 /> Ground water monitoring and sampling for the first quarter of 1999 are summarized below <br /> • Blaine Tech Services, Inc (Blaine), of San Jose, California measured ground water <br /> levels and collected ground water samples in Wells S-1 through S-3 on February 23, <br /> 1999 Samples were transported to Sequoia Analytical San Carlos, California for <br /> chemical analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a ground water contour map using the water level data <br /> (Plate 2) Ground water flow direction is to the southeast at an approximate <br /> Oak I an d CA hydraulic gradient of 0 005 <br /> I <br /> Sonoma CA <br /> Portland OR <br /> S e a t t I e w A * Ground water samples collected from Wells S-2 and S-3 were ND for TPPH, benzene, <br /> and MTBE Ground water samples collected from Well S-1 contained TPPH and <br /> umbna benzene concentrations of 72,800 ppb and 2,970 ppb, respectively MTBE was not <br /> Environmental <br /> EnvironmeYt al detected m the ground water sample from S-1, however the detection limit was <br /> elevated (<2000 ppb) A chemical concentration map is presented on Plate 2 <br /> 49 Perkins Street <br /> Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-485D <br /> Fax(707)935-6649 <br />