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r <br /> CAMBRIA <br /> February 28, 1998 <br /> Mr Alex Perez <br /> Shell Oil Products Company <br /> P O Box 8080 <br /> Martinez, California 94553 <br /> Re Quarterly Monitoring Report - First Quarter 1998 <br /> Shell Service Station <br /> 2575 Country Club Boulevard <br /> Stockton, California <br /> WIC #204-7524-3505 <br /> Dear Mr Perez <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates 1 and 2) This report was <br /> prepared to meet quarterly reporting guidelines issued by the Regional Water Quality Control <br />. Board, Central Valley Region and San Joaquin County Public Health Services <br /> Quarterly Monotolring & Sampling Summary <br /> Ground water monitoring and well sampling for the first quarter of 1998 are summarized below <br /> ® Blaine Tech Services, Inc (Blaine) of San Jose, California measured ground water levels and <br /> collected ground water samples from Wells MW-2 through MW-14, RW-lA, the off-site <br /> Caltrans irrigation well, and 5 off-site domestic wells on January 29, 1998 The samples <br /> CAMBRIA were transported to Sequoia Analytical of Redwood City, California for chemical analysis <br /> ENVIRONMENTAL ® Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> TECHNOLOGY,INC data and prepared a ground water contour neap (Plate 2) for the shallow wells (Wells MW-2 <br /> through MW-11 and RW-1 A) The ground water flow direction ranges from westerly to <br /> 270 PERKINS STREET, southwesterly with an approximate hydraulic gradient of 0 006 <br /> P 0 Box 259 <br /> © Ground water samples collected from shallow wells MW-2 through MW-11 and RW-IA <br /> SONOMA, contained TPPH concentrations ranging from ND to 120,000 ppb, benzene concentrations <br /> CA95476 ranging from ND to 18,000, and MTBE concentrations ranging from ND to 970,000 ppb <br /> These data are summarized on Table I and shown on the chemical concentration map <br /> OP (Plate 2) <br /> FAx qq 935-6649 <br />