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,l <br /> �-� - en viros. <br /> �OICE <br /> I f f <br /> t <br /> April 3, 1996 <br /> Mr. R. Jeff Granberry <br /> Shell Oil Products Company <br /> P O Box 4023 <br /> Concord, California 94524 <br /> RE: Quarterly Monitoring Report - First Quarter 1996 <br /> Shell Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> WIC #204-7524-4305 <br /> Dear Mr Granberry <br /> This Quarterly Monitoring Report describes the recently completed activities associated <br /> with ground water monitoring and sampling at the referenced site (Plates 1 and 2) This <br /> report was prepared to meet quarterly reporting requirements issued by the Regional Water <br /> Quality Control Board, Central Valley Region and San Joaquin Environmental Health <br /> Division <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the first quarter of 1996 are summarized below <br /> 0 Blaine Tech Services, Inc (Blaine) measured ground water levels and collected <br /> samples from nine on-site wells (Wells MWA through MW-9) and one off-site well <br /> (Well MW-10) on February 27, 1996 Samples were transported to National <br /> Environmental Testing, Inc (NET) in Santa Rosa, California for chemical analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and prepared a <br /> ground water contour/benzene concentration map (Plate 2) Ground water flow <br /> direction appears to extend radially outward from Well MW-2 The hydraulic <br /> gradient was calculated to be 0 025 <br /> • Ground water samples collected from Wells MW-1 through MW-10 contained <br /> TPPH concentrations ranging from none detected(ND) to 22,000 parts per billion <br /> (ppb) Benzene concentrations ranged from ND and 1,100 ppb A ground water <br /> contour/benzene concentration map is presented on Plate 2 <br /> Enviros, Inc 270 Perkins Street Sonoma Calltorma Tel 707/935 4850 <br /> P O Box 259 95476 0259 Fax 707/935 6649 <br /> J <br />