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, s a SECOR RECLF,� --�`"�1 Internataanal Incorporated � FEB � o zooz February 19, 2002 77TO 61205 010416 ENVIRONMENT HEALTH Mr Michael Infurna PERMIT/SERVICES San Joaquin County Public Health Services Environmental Health Division 304 East Webber Avenue, Third Floor Stockton, CA 95202 Re: Work Plan for 5-Day Dual Phase Extraction Pilot Test Tosco Service Station #1205 16470 Cambridge Street Lathrop, California Dear Mr Infurna This letter, prepared by SECOR International Incorporated (SECOR) on behalf of Phillips Petroleum Company, presents a work plan to perform a 5-day dual phase extraction (DPE) pilot test at the subject site (Figure 1) The 5-day DPE event will be performed at the site using a SECOR mobile treatment system The SECOR DPE system is designed to extract soil vapor and groundwater simultaneously from the subsurface The purpose of this event is to determine feasibility of using DPE as a remedial solution to remove volatile organic compounds (VOCs) from the soil and groundwater The results of the test can be used to design or size the appropriate extraction and control equipment needed to for a soil/groundwater remediation project A secondary benefit of the DPE pilot test will be the removal and destruction of petroleum hydrocarbons in soil and groundwater within the source area at the site This work plan includes a brief discussion of site background and previous investigations, proposed scope of work, and schedule SITE BACKGROUND AND PREVIOUS INVESTIGATIONS The site is located on northeast corner of Cambridge Street and Louise Avenue in Lathrop, California, and is an operating Circle K mini mart and TOSCO service station (Figure 1) In November 1997, Pacific Environmental Group (PEG) performed oversight and sampling during the removal of one 4,000-gallon and two 10,000-gallon underground storage tanks (UST's), product dispensers, and associated product piping from the site during facility upgrade activities Approximately 1,241 tons of hydrocarbon impacted soil from beneath the UST's and from the new tank pit excavation Additionally, approximately 17,000 gallons of hydrocarbon impacted groundwater from the new tank pit excavation Total petroleum hydrocarbons as gasoline (TPHg) were reported at concentrations ranging from 130 ppm to 5,800 ppm Methyl tert-butyl ether(MtBE) was reported in soil at concentrations ranging from 0 19 ppm to 3 6 ppm (PEG, 1998) 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 861 0400 916 861 0430 Fax u wuf secor com