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f f <br /> CAM3RDA <br /> March 15, 1999 <br /> Ms Lori Duncan <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 /> C M Weber Enterprises Property <br /> 141 North El Dorado Street <br /> Stockton, California <br /> WIC #204-7524-1509 <br /> Dear Ms Duncan <br /> This Quarterly Monitoring Report describes the recently completed ground water monitoring <br /> and sampling activities at the referenced site Cambria Environmental Technology, Inc <br /> (Cambria) prepared this report to meet quarterly reporting requirements issued by the <br /> Regional Water Quality Control Board, Central Valley Region and San Joaquin County Public <br /> 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 <br /> most recent soil vapor extraction system operation utilizing activated carbon was terminated <br /> on 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 /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the first quarter of 1999 are summarized below <br /> Oakland CA <br /> Sonoma CA o Blaine Tech Services, Inc (Blaine), of San Jose, California measured ground water <br /> Portland OR levels and collected ground water samples in Wells MW-1 through MW-5, RW-1, <br /> Seattle WA <br /> RW-2, and VEW-1 through VEW-4 on January 26, 1999 The samples were <br /> Cambria transported to Sequoia Analytical of Petaluma, California for chemical analysis <br /> Environmental <br /> Technology,inc <br /> o Cambria evaluated water-level measurement data and prepared a ground water contour <br /> l0erkms Street map (Plate 2) Ground water flow direction is generally to the east with some <br /> P O Box 259 <br /> Sonoma CA 95476 <br /> Tel(7o7)935-4$50 <br /> Fax(7o7)935-6649 <br />