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c'- <br /> t <br /> !—A1' enviroso <br /> - <br /> . <br /> i; <br />'tel <br /> June 28, 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 - Second 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 />. A soil vapor extraction (SVE) system has been operational at this site since September 17, <br /> 1992 The following table summarizes remediation performed to date <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS (TPPH) <br /> EXTRACTED - VAPOR PHASE POUNDS <br /> COMPOUND 2nd QUARTER 1996 CUMULATIVE <br /> TPPH 34 17,607 <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the second quarter of 1996 are summarized <br /> below <br /> • Blaine Tech Services, Inc (Blaine) measured ground water levels and collected <br /> samples from nine on-site wells (Wells MW-1 through MW-9) and one off-site well <br /> (Well MW-10)on May 15, 1996 Samples were transported to Sequoia Analytical <br /> (Sequoia) of Redwood City, California for chemical analysis <br /> • Enviros, Inc (Enviros) evaluated water-level measurement data and prepared a <br /> ground water contour map (Plate 2) Ground water flow direction appears to be <br /> northeast and southwest from a Iocalized ground water mound centered on Well <br /> MW-2 The hydraulic gradient was calculated to be 0 03 <br /> • Ground water samples collected from Wells MW-1 through MW-10 contained <br /> . TPPH concentrations ranging from none detected (ND) to 13,000 parts per billion <br /> FrfviroR, Inc 270 Perkins Street Sonoma California Tel 707/935 4850 <br /> P 0 Box 259 954 76 0259 Fax 707/935 5649 <br />