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f ' <br /> C A M B R I A IT �, ::!f,.�w <br /> t <br /> February 28, 1999 <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services <br /> P.O. Box 388 <br /> Stockton, California 95201 <br /> Re: Quarterly Monitoring Report - First Quarter 1999 <br /> { Shell-branded Service Station <br /> "2575 Country Club Boulevard <br /> Stockton, California <br /> WIC #204-7524-3505 <br /> Dear Mr. Infurna: <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates- l and 2). This report <br /> 1 <br /> was prepared to meet quarterly reporting guidelines issued by the Regional Water, Quality <br /> Control Board, Central Valley Region and San Joaquin County Public Health Services. <br /> Quarterly Monitoring & Sampling Summary <br /> I Ground water monitoring and well sampling for the first quarter of 1999 are summarized <br /> 1 <br /> € below: <br /> Blame Tech Services, Inc. {Blaine} of San Jose, California measured ground water. levels <br /> is and collected ground water samples from Wells MW-2 through MW-14, RW-1A, the <br /> off--site Caltrans irrigation wel1, and 5: off-site domestic wells on January 27, 1999. The <br /> samples were transported to Sequoia Analytical of Redwood City, California for chemical <br /> analysis.. <br /> • Cambria Environmental Technology, Inc. (Cambria) evaluated water-level measurement <br /> data and prepared a ground water contour map (Plate 2) for the shallow wells (Wells <br /> Oakland, CA MW-2 through MW-11 and RW-]A). The ground water flow direction is generally <br /> Sonoma, CA towards the west to southwest at an approximate hydraulic gradient ranging from 0.003 <br /> Portland, OR to 0.01. <br /> s <br /> Seattle, WA <br /> i. Cambria • Ground water samples collected from :shallow Wells MW-2 through MW-6, MW-8, and <br /> Environmental RW-lA contained TPHg concentrations ranging from ND to 120,000 ppb, benzene <br /> Technology,Inc. concentrations ranging from ND to 18,000, and MTBE concentrations ranging from 3.1 <br /> `Perkins Street to 380,000 ppb. Methanol was detected in ground water samples collected from Wells <br /> Box 259 <br /> Sonoma,CA 95476 <br /> ? Tel(7o7)935-4850 <br /> Fax(7o7)935-6649 <br /> i , <br />