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{ t <br /> i <br /> CAMBRIA <br /> March 15, 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 /> C M Weber Enterprises Property <br /> 141 North El Dorado Street <br /> Stockton, California <br /> WIC #204-7524-1509 <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 requirements issued by the Regional Water Quality Control <br /> Board, Central Valley Region and San Joaquin County Public Health Services (SJCPHS) <br /> A ground water extraction system was in operation at the site from March 2, 1993 through <br /> September 5, 1995 Several soil vapor extraction systems have operated at the site The most <br /> recent soil vapor extraction system operation utilizing activated carbon was terminated on <br /> August 21, 1996 The following table summarizes remediation performed to date <br /> Total Purgeable Petroleum Hydrocarbons Removed (pounds) <br /> LIQUID PHASE VAPOR PHASE CUMULATIVE <br /> 37 3277 3314 <br /> CAMBRIA <br /> ENVIRONMENTAL Quarterly Monitoring & Sampling Summary <br /> TECHNOLOGY,INC <br /> Ground water monitoring and sampling for the first quarter of 1998 are summarized below <br /> 270 PERKINS STREET, <br /> Pa sox 259 Blaine Tech Services, Inc (Blaine), of San Jose, California measured ground water levels <br /> in Wells MW-1 through MW-5, RW-1, RW-2, and VEW-1 through VEW-4 on January <br /> SONOMA, 12, 1998 Ground water samples were collected from the wells on January 13, 1998 <br /> CA 95476 The samples were transported to Sequoia Analytical of Redwood City, California for <br /> chemical analysis <br /> 0935-00 <br /> FAx(7q 935,6649 <br />