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�- �. .f .a•' ��` tg - � mr ��� k$ -°�y'�� !r( '—�- Jam �t �¢��.''•� • <br /> - <br /> x£. <br /> 2 <br /> (01DIPO <br /> DU PONT ENVIKONMENTAL WNEDIA110N SERVICLS { ;? <br /> 7063 Koll Center Parkway,Suit•-101 <br /> Ple.isanlon,CA 9•t566 <br /> 14151 462-7772 January 9, 1991 <br /> Fax:54151 462-7944 Job No. 1088-R-4 <br /> Conoco Inc. <br /> 600 North Dairy Ashford <br /> TR 3056 <br /> Houston,Texas 77079 P E C E i V E D <br /> ATTENTION: Mr.Gregory I. Fletcher ,jl;1; j <br /> Coordinator-Environmental Affairs <br /> SUBJECT- Monthly Status Report - December 1990 ENVIRONMENTAL <br /> Former Econo Gas Station AFFAIRS <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 December 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. <br /> Based on operating parameters listed on Table A,approximately 700 pounds(114 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 21,700 pounds (3,520 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 REMEDIATIONSER ICES ICat <br /> oseph A. DeBiaso,Jr. Robert A. in, PE, RA <br /> Staff Engineer Senior Engineer <br /> JAD/RAK:ct <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 /> - <br /> Better Thing, For Setter living <br />