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CAMBRIA = <br /> October 25, 1999 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - Third Quarter 1999 <br /> Former Shell Service Station <br /> 1267 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 129480 <br /> Incident No 97093419 <br /> SJCPHS Code 505602 <br /> Dear Mr lnfurna <br /> This report describes the recently completed activities associated with groundwater <br /> monitoring and sampling at the referenced site (Figures 1 and 2) This report was prepared to <br /> meet reporting requirements issued by the Regional Water Quality Control Board, Central <br /> Valley Region and San Joaquin County Public Health Services ( SJCPHS) <br />. Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for the third quarter is summarized below <br /> ® Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels and collected samples from wells S-i through S-6 on August 31, 1999 Samples <br /> were transported to Sequoia Analytical (Sequoia) in San Carlos and Morgan Hill, <br /> California for chemical analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour/chemical concentration map <br /> (Figure 2) Groundwater flow direction is northwesterly an approximate hydraulic <br /> o a k l a n d CA gradient of 0 005 <br /> Sonoma CA <br /> Portland OR 0 Groundwater samples collected from wells S-1 through S-3 contained TPHg at <br /> Seattle WA <br /> concentrations ranging from 86 1 to 18,400 ppb, TPHd at concentrations ranging <br /> Cambna from 180 to 4,770 ppb, and benzene at concentrations ranging from 0 693 to 100 <br /> Environmental ppb Groundwater samples collected from wells S-4, S-5, and S-6 did not contain <br /> Technology,Inc <br /> detectable levels of TPHg, TPHd or BTEX MTBE (by EPA Method 8260) was not <br /> 40 Perkins street detected in any of the wells <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />