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i Farmer Beacon Station No. 474 May 15, 2000 Stockton California Results of Additional Subsurface Investigation MW-10 and MW-9, respectively. Current site data indicate a defined groundwater plume in . the dispenser island area as shown on Figure 3. The data generated by previous work and this additional subsurface investigation is adequate to proceed with a detailed description of the site environmental conditions in a Problem Assessment Report (PAR). The data generated from the remedial testing indicate that vapor extraction and air sparging are feasible methods to reduce source area concentrations in site soil and groundwater and prevent further groundwater plume migration. A Corrective Action Plan describing the design, installation and operation of a soil and groundwater remedial system should be developed concurrently with the PAR. DISTRIBUTION A copy of this investigation results report should be forwarded to: Mr. Michael Infurna Jr. Mr. Gordon Boggs San Joaquin County Public Health Services Regional Water Quality Control Board - Environmental Health Division Central Valley Region 304 East Weber Avenue, Third Floor 3443 Routier Road, Suite A P. O. Box 388 Sacramento, California 95827-3098 Stockton, California 95201-0388 REFERENCES Acton, Mickelson, van Dam, Inc., January 23, 1995, Work Plan for Hydrogeologic Testing and Additional Subsurface Assessment Beacon Station No. 474, 3443 East Main Street, Stockton, California. AMC Job No. 19012.0517. Horizon Environmental Inc., August 2, 1996, Report of Additional Subsurface Investigation for Beacon Station No. 474, 3443 East Main Street, Stockton, California. Horizon Report No. 1474.11. El Dorado Environmental Inc. December 19, 1997, Fourth Quarter 1997 Ground Water Monitoring Report, Beacon Station #474, 3440 East Main Avenue, Stockton, California. -- . 1474.22rpt 9 HORIZON ENVIRONMENTAL INC.