SITE INFORMATION AND CORRESPONDENCE

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oUPQNT RECEIVED 4� DU PONT ENVIRONMENTAL REMEDIATION SERVICES NOV 190 7068 Koll Center Parkway, Suite 401 Pleasanton, CA 94566 (415) 462-7772 November 12, 1990 Fax: (415) 462-7944 Job No. 90-E-134 Ultramar Inc. 525 West Third Street Hanford, California 93230 ATTENTION: Mr. Glenn R. Dembroff Manager, Marketing Environmental SUBJECT: Monthly Status Report - October 1990 Beacon Station 696 800 East Highway 12 Lodi, California Dear Mr. Dembroff: This is a monthly status report for the soil remediation system at the above-referenced site, for the month of October 1990. A Du Pont Environmental Remediation Services technician visited the site on a weekly basis. Typical activities that were performed during the visit included equipment inspection, instrument calibration, and influent and effluent concentration measurements. A hand-held organic vapor analyzer(OVA)was used by our technician to measure influent hydrocarbon concentrations. Based on operating parameters listed on Table A, approximately 934 pounds (152 gallons) of gasoline have been extracted during the reporting period. The remediation system has been operating on the on-site vacuum wells since December 1989, and off-site vacuum wells since May 16, 1990. Since then, approximately 9,358 pounds (1,519 gallons) of gasoline have been extracted and properly treated. Attached are two figures which show gasoline extracted per month (Figure 1) and cumulative gasoline extracted (Figure 2). Vacuum wells that were in service this month are listed in Table B. This monthly report is not required by the regulatory) agencies, and therefore need not be forwarded. However,should Ultramar desire to forward this to show remediation progress, the agencies that would i be most interested would be: SAN JOAQUIN COUNTY AIR POLLUTION CO ROL DISTRICT P.O. Box 2009 Stockton, California 95201 ATTENTION: Mr. Darrell Singleton, Air Pollution Inspector Better Things For Better Living r i