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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 /> Former Shell Service Station <br /> 1267 Country Club Boulevard <br /> Stockton, California <br /> WIC #204-7524-0204 <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 I 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 /> ® Blaine Tech Services, Inc (Blaine) of San Jose, California measured ground water <br /> levels and collected samples from Wells S-1 through S-6 on February ll, 1999 <br /> Samples were transported to Sequoia Analytical (Sequoia) in Petaluma, California for <br /> 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 northwesterly to northeasterly at <br /> an approximate hydraulic gradient of 0 002 <br /> o a k l a n d CA . Ground water samples collected from Wells S-1 through S-4 contained TPPH at <br /> Sonoma CA <br /> Portland OR concentrations ranging from ND to 18,000 ppb, TEPH at concentrations ranging <br /> Seattle WA from 90 5 ppb to 3,540 ppb, and benzene at concentrations ranging from ND to 1 12 <br /> ppb Ground water samples collected from Wells S-5 and S-6 did not contain <br /> Cambria detectable levels of TPP", TEPH, BTEX, or MTBE MTBE was detected in Well <br /> Environmental <br /> Technology,Inc S-1 at a concentration of 5 02 ppb and was not detected in any other wells <br /> Perkins Street <br /> U Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />