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K r <br /> A`IVl B R I A <br /> 00 <br /> S PY <br /> May 31, aQj <br /> Mr Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report — First Quarter 2000 <br /> Former Texaco Service Station <br /> 440 West Charter Way <br /> Stockton, California <br /> SAP Code 121258 <br /> Incident No 88870583 <br /> SJCPHS/EHD Site Code 1055 <br /> Dear Mr Rowe <br /> This report describes the recently completed groundwater monitoring and sampling activities <br /> at the referenced site (Figures 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 first quarter of 2000 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-6, MW-9 through <br /> MW-11, MW-13 through MW-15, and MW-17 on February 22, 2000 Wells MW-7 <br /> and MW-8 were inaccessible, and MW-16 was reported to be dry Samples were <br /> transported to Sequoia Analytical Laboratory San Carlos, California for chemical <br /> analyses <br /> Oakland CA <br /> San Ramon CA • Cambria evaluated water-level measurement data and prepared a groundwater contour <br /> Sonoma CA map (Figure 2) Groundwater flow direction is generally outward from a hydraulic <br /> Portland OR mound located near well MW-3 The approximate hydraulic gradient ranges from <br /> Cambria 0 01 to 0 03 <br /> Environmental <br /> Technology,Inc 0 TPHg was detected in wells MW-1, MW-3 through MW-6, MW-9 through MW-11, <br /> *_ ,kins street MW-14, MW-15, and MW-17 at concentrations ranging from 82 1 to 37,400 ppb <br /> PO Box 259 Wells MW-1, MW-3, MW-5, MW-6, MW-9 through MW-11, MW-14, MW-15, and <br /> Sonoma CA 95476 <br /> 7ei(707)935-4850 <br /> Fax(707)935-6649 <br />