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;51! -M."n''ma ��;g <br /> ('-d U�Onf <br /> DU PONT ENVIRONMEN MI. REMEDIA1ION SFRVICES F NVIPONNMF N rAL Htr1I_ jq <br /> F,FRN-1IT/SERVICES <br /> 7006 Koll Ce-nier I'arkway,Suite•101 April 17, 1991 <br /> I'leasanton,CA 94560 Joh No. 1088-R-4 <br /> (4 15)462••7772 <br /> Fax:(415)462.794.1 <br /> Conoco Inc. <br /> 600 North Dairy Ashford <br /> TI2 3056 <br /> Houston,Texas 77079 <br /> A'I-I'ENUON: Mr. Gregory P. Fletcher <br /> Coordinator- Environmental Affairs <br /> SUBJECT: Quarterly Status Report _ <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 in-situ sail remediation system at the above-referenced site from <br /> February 1 to March 28, 1991. The monthly status report for January 1991 has already been issued. <br /> The soil vapor extraction system consists of a series of vapor wells, a vacuum blower, and a thermal <br /> incinerator. <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 soil vent gas concentration measurements, and control system adjustments. A <br /> hand-held organic vapor analyzer (OVA)was used by field technicians to measure the hydrocarbon <br /> concentrations. Monthly influent soil vent gas samples were collected for laboratory analysis. <br /> Based on operating parameters listed on Table A and an extraction rate of 100 cubic feet per minute, <br /> approximately 2,500 pounds(400 gallons) of gasoline were extracted during this reporting period. The <br /> remediation system has been operating since August 1939,and since;then,approximately 24,700 pounds <br /> (4,000 gallons) of gasoline have been extracted and properly treated. Attached are two figures which <br /> show the mass of gasoline extracted per month(Figure 1)and the cumulative mass of gasoline extracted <br /> (Figure 2). <br /> Ilave a safe day, <br /> DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> ]oseph A. D e B i iso,Jr. Michael Reese <br /> Staff Engineer Project Manager <br /> JAD/MR:ct <br /> Attachments: Tabic A- 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 />