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DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 7068 Koll Center Parkway, Suite 401 <br /> Pleasanton, CA 94566 February 1 , 1993 <br /> (510) 462-7772 Job No 0511-42-5010-04 <br /> Fax (510) 462-7944 <br /> Conoco Inc <br /> 600 North Dairy Ashford <br /> MO 3018 <br /> Houston, Texas 77079 <br /> ATTENTION Mr Gregory P Fletcher <br /> Senior Coordinator - Environmental. Affairs <br /> SUBJECT Quarterly Monitoring Report <br /> October - December 1992 <br /> Former Econo Gas Station <br /> 4325 East Washington Street <br /> Stockton, California <br /> Dear Mr Fletcher <br /> This report presents the status of the soil remediation system located at Conoco Inc 's <br /> (Conoco) former Econo Gas Station, 4325 East Washington Street, Stockton, California <br /> between September 30, 1992 and December 30, 1992 A Du Pont Environmental <br /> Remediation Services (DERS) technician visited the site on a weekly basis Typical activities <br /> that were performed during a visit included equipment inspection, instrument calibration, <br /> influent and effluent soil vent gas concentration measurements, and control system <br /> adjustments A hand-held organic vapor analyzer (OVA) was used by the technician to <br /> measure the vent gas hydrocarbon concentrations Monthly influent soil vent gas samples <br /> were collected for laboratory analyses DERS maintained a site visit sign-in log The log is <br /> available for inspection upon request Laboratory results and chain-of-custody forms are <br /> attached in Appendix A <br /> The soil remediation system consists of a series of vapor wells, a vacuum extraction blower, <br /> and a thermal incinerator The extraction rate of the soil remediation system is <br /> approximately 105 standard cubic feet per minute The operating efficiency (actual <br /> operating time versus the total time in the reporting period) of the system was 95 percent <br /> Based on soil vapor concentrations presented in Table A, approximately 15,051 pounds <br /> (2,443 gallons) of gasoline were extracted during this reporting period The remediation <br /> Better Things For Better Living <br /> 0511 15 <br />