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aUPO�� <br /> �— DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 7068 Koll Center Parkway,Suite 40: <br /> Pleasanton,CA 94566 <br /> 14151462-7772 <br /> Fay.:14151 462-7944 <br /> October 12, 1990 <br /> Conoco Inc. Job No. 1088-R-4 <br /> 600 North Dairy Ashford <br /> TR 3056 <br /> Houston,Texas 77079 <br /> R CEI VI <br /> ATTFN i ION: Mr. Gregory P. Fletcher <br /> Coordinator-Environmental Affairs <br /> SUBJECT: Monthly Status Report -September 1990 :NtllRi?fIMF�J "f�i_ <br /> Former Econo Gas Station RCA��� <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 September 1990. <br /> A Du Pont Environmental Remediation Services technician visited the site on a weekly basis. Typical <br /> �^ activities that were performed during the 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 /> s Based on operating parameters listed on Table A,approximately 2,045 pounds(31gallons)of gasoline <br /> have been extracted during this reporting period, The remediation system has _een operating since <br /> ' August 1989, and since then, approximately I7,791 pounds (2,888 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 /> Have a safe day, <br /> DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> `` L�3 �- "tel' lz% <br /> Joseph A. De Biaso,Jr. Robert A. Katin, PE, REA <br /> Staff Engineer Engineering Manager <br /> JAD/RAK:vo <br /> Attachments: Table A- Operating Parameters <br /> Table B- Summary of Soil Vapor Laboratory Results <br /> Figure I -Gasoline Extracted Per Month <br /> Figure 2-Cumulative Gasoline Extracted <br /> Better Things For Better Living <br /> :f <br />