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CAMBRIA "fs1, <br /> ' �rrxrTri <br /> 1 '� <br /> Augustt20, 1999 <br /> Mr Ron Rowe <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - Second Quarter 1999 <br /> Former Texaco Service Station <br /> 440 West Charter Way <br /> Stockton, California <br /> SAP Code # 121258 <br /> Incident 88870583 <br /> SJCPHS Site Code 1055 <br /> Dear Mr Rowe <br /> This report describes the recently completed groundwater monitoring and sampling activities <br /> at the referenced site (Plates 1 and 2) Cambria Environmental Technology, Inc (Cambria) <br /> prepared this report to meet quarterly reporting requirements issued by the Central Valley <br /> Regional Water Quality Control Board and San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS-EHD) <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for the second quarter of 1999 are summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels and collected samples from Wells MW-1 through MW-11, MW-13 through <br /> MW-15, and MW-17 on May 25, 1999 Well MW-16 was reported to be dry <br /> Samples were transported to Sequoia Analytical Laboratory San Carlos, California for <br /> chemical analysis <br /> • Cambria evaluated water-level measurement data and prepared a groundwater contour <br /> Oakland CA map (Plate 2) Groundwater flow direction ranges from south to southeast at an <br /> Sonoma CA approximate hydraulic gradient of 0 003 to 0 007 <br /> Portland OR <br /> Seattle WA <br /> • Groundwater samples collected from Wells MW-1 through MW-5, MW-9, MW-11, <br /> Cambria and MW-15 contained TPPH at concentrations ranging from ND to 11,000 ppb, <br /> Environmental benzene concentrations ranging from ND to 3,800 ppb, and MTBE concentrations <br /> Technology,Inc <br /> ranging from ND to 240 ppb TPPH, benzene or MTBE was not detected in Wells <br />.10 Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />