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C A M B R I A ,I_'1t <br />,\ r October 8, 1999 <br /> i 1 F !.. <br /> Mr Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95201-0388 <br /> Re Second Quarter 1999 Monitoring and Remediation Report <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, California <br /> Incident#98995874 <br /> Cambria Project#2441-0324-002 <br /> SJCEHD Site Code 506186 <br /> Dear Mr Rowe <br /> On behalf of Equiva Services LLC, Cambria Environmental Technology, Inc (Cambria) is <br /> subrmtting this ground water monitoring report in accordance with the reporting requirements of <br /> 23 CCR 2652d <br /> SECOND QUARTER 1999 ACTIVITIES <br /> Ground Water Monitoring Blaine Tech Services, Inc (Blaine) of San Jose, California gauged <br /> and sampled all wells and compiled the gasoline constituents data Cambria compiled the <br /> additional constituents analytical data (Tables 1 and 2) and prepared a ground water elevation <br /> contour map (Figure 1) The Blaine report, presenting the laboratory report and supporting field <br /> notes, is included as Attachment A <br /> Ground Water Remedurtion. Blaine began weekly purging of onsite monitoring well MW-1 on <br /> November 10, 1998, and onsite extraction well EW-1 on March 11, 1999 Cambria compiled the <br /> Oakland CA number of gallons removed and analytical data on Table 1, and the oxygenate compounds <br /> Sonoma CA analytical data on Table 2 <br /> Portland OR <br /> Seattle WA <br /> Subsurface Investigation Cambria submitted the results of our February, 1999 investigation in <br /> Cambria our Monitoring Well and CPT Investigation Report dated April 16, 1999 <br /> Environmental <br /> Technology, Inc Ground Water Pumping Test- Cambria performed a ground water pumping test, including a <br /> 465th Street step-discharge test and a constant discharge test on April 4 and 5, 1999, and submitted a Pump <br /> ,te a Test Investigation Report on July 7, 1999 <br /> Oakland CA 946o8 <br /> Tel(510)420-0700 <br /> Fax(5io)420-9170 <br />