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4 <br /> * 1 <br /> CAMBRIA _ <br /> November 15, 1998 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> P 0 Box 388 <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Report - Third Quarter 1998 <br /> Former Shell Service Station <br /> 1267 Country Club Boulevard <br /> Stockton, California <br /> WCC 4204-7524-0204 <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 reporting requirements issued by the Regional Water Quality Control <br /> Board, Central Valley Region and the San Joaquin County Environmental Health Division <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for this quarter are summarized below <br /> o Blaine Tech Services, Inc (Blaine) of San Jose, Caltforrn)a measured ground water <br /> levels and collected samples from Wells S-1 through S-6 on August 12, 1998 <br /> Samples were transported to Sequoia Analytical (Sequoia) in Redwood City, California <br /> for chemical analysis <br /> Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a ground water contour/chemical concentration map <br /> (Plate 2) Ground water flow direction ranges from northerly to northeasterly at an <br /> approximate hydraulic gradient of 0 002 <br /> Oakland CA 0 Ground water samples collected from Wells S-1 through S-6 contained TPPH at <br /> Sonoma CA <br /> Portland OR concentrations ranging from ND to 16,000 ppb, TEPH concentrations ranging from <br /> Seattle WA ND to 6,900 ppb, benzene concentrations ranging from ND to 130 ppb, and MTBE <br /> concentrations ranging from ND to 410 ppb <br /> Cambria <br /> Environmental <br /> Technology, Inc <br /> AM70 Perkins Street <br /> O Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935"4850 <br /> Fax(707)935-6649 <br />