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r <br /> =P0 <br /> ..� DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 7068 Koll Center Parkway,Suite 401 <br /> Pleasanton,CA 94566 <br /> !4151467.-7772 <br /> Fax;14151 462-7944 December 0, 1990 <br /> Job No. 108$-R-4 <br /> Conoco Inc. R E f✓ EE I V S D <br /> 600 North Dairy Ashford <br /> TR 3056 <br /> Houston,Texas 77079 G v 1 <br /> ATTENTION: Mr, Gregory P. Fletcher ChlWR 'dlN7 AL <br /> Coordinator- Environmental Affairs <br /> SUBJECT: Monthly Status Report-November 1990 <br /> Former Econo Gas Station <br /> 4325 East Washington Street <br /> Stockton, California <br /> Dear Mr. Fletcher: <br /> This is a monthly status report for the soil remediation system at the above-referenced site, for the <br /> month of November 1990. <br /> A Du Pont Environmental Remediatior.Services technician visited the site on a weekly basis. Typical <br /> activities that were performed during t:e visit included equipment inspection, instrument calibration, <br /> influent and effluent concentration measurements, and control system adjustments. A hand-held <br /> organic vapor analyzer(OVA)was used by field technicians to measure hydrocarbon concentrations <br /> and one tedlar air bag sample was collected for laboratory analysis. On August 15, 1990 the flow rate <br /> was increased to 100 standard cubic feet per minute. <br /> Based on operating parameters listed on Table A,approximately 2150 pounds(354 gallons)of gasoline <br /> have been extracted during this reporting period. The remediation system has been operating since <br /> August 1989, and since then, approximately 21,000 pounds (3,400 gallons) of gasoline have been <br /> extracted and properly treated. Attached are two figures which show Gasoline Extracted Per Month <br /> (Figure 1) and Cumulative Gasoline Extracted (Figure 2). <br /> 4 <br /> Have a safe day, <br /> 1D PONT ENVIRONMENTAL REMEDIATION SER C <br /> Joseph A.De Biaso,Jr. Robert A.Kahn, PE, REA <br /> Staff Engineer Engineering Manager <br /> -J.-XD/RAK:vo/rw ------ -- <br /> Attachments: Table A- Operating Parameters <br /> Table B - Summary of Soil Vapor Laboratory Results <br /> �! Figure 1-Gasoline Extracted Per Month <br /> Figure 2-Cumulative Gasoline Extracted <br /> Better Things For Better Living <br />