Laserfiche WebLink
C A M B R I A <br /> -7 ! 9 <br /> October 21, 1999 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> J <br /> Re Quarterly Monitoring Report — Third Quarter 1999 _ �2-(PO <br /> Shell-branded Service Station <br /> 2494 Fremont Street S (— <br /> Stockton, California <br /> SAP Code 136141 <br /> Incident No 98996181 <br /> Dear Mr Infurna <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 quarterly reporting requirements issued by the Regional Water Quality Control Board, <br /> Central Valley Region and San Joaquin County Public Health Services (SJCPHS) <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for the third 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 August 5, 1999 <br /> Samples were transported to Sequoia Analytical Morgan Hill, California for chemical <br /> analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-leve\ <br /> measurement data and prepared a groundwater contour map (Figure 2) Groundwater <br /> flow direction is to the southeast at an approximate hydraulic gradient of 0 002 <br /> o a k I a n d CA . Groundwater samples collected from wells S-2 and S-3 were ND for TPHg, benzene, <br /> Sonoma CA and MTBE Groundwater samples collected from well S-1 contained TPHg and <br /> Portland OR <br /> S e a t t I e WA benzene concentrations of 86,600 ppb and 2,420 ppb, respectively MTBE was not <br /> detected in the groundwater sample from S-1 at a detection limit of 500 ppb A <br /> Cambria chemical concentration map is presented on Figure 2 <br /> Environmental <br /> Technology,Inc <br /> .Perkins Sireet <br /> P o Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />