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SECOR <br /> International Incorporated <br /> November 20,2001 <br /> Project 077.43323.210 <br /> Mr. Samuel Savig ; �) <br /> San Joaquin County Public Health Services 1. !°� 2001 <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 <br /> Re: Work Plan for Site Assessment <br /> Arco Service Station#5450 <br /> 1617 West Fremont Street <br /> Stockton,California <br /> Dear Mr. Savig: <br /> This letter,prepared by SECOR International Incorporated(SECOR)on behalf of <br /> Atlantic Richfield Company(ARCO),presents a work plan for site assessment at the site <br /> referenced above (Figures 1 and 2). This work plan has been prepared in response to the <br /> San Joaquin County Public Health Services (SJCPHS) letter dated August 31,2001 <br /> (Attachment A). This work plan includes a brief discussion of site background, a <br /> summary of previous investigations,proposed scope of work, and schedule. <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> Site Description <br /> The site is located at 1617 West Fremont Street, near the intersection of West Fremont <br /> Street and North Pershing Avenue. The site is an operating gasoline service station and <br /> AN1/PM mini-mart. Currently, site facilities include three gasoline underground storage <br /> tanks (USTs)and associated product lines and dispensers. <br /> Previous Investigations <br /> On October 5, 1995,Brown and Caldwell (BC)performed oversight and soil sampling <br /> during facility product piping upgrades. Fourteen soil samples were collected 18 inches <br /> beneath the product piping trenches. Laboratory analysis reported maximum <br /> concentrations of gasoline range total petroleum hydrocarbons (TPHg),benzene,toluene, <br /> ethyl benzene,and total xylenes(collectively BTEX)of 360,000 milligrams per <br /> kilograms(mg/kg), 5,600 mg/kg, 2,400 mg/kg,6,700 mg/kg, and 39,000 mgtkg, <br /> respectively, in soil sample T-14 near the southwestern dispenser island. Approximately <br /> 35 cubic yards of soil was removed during over excavation activities of the impacted soil. <br /> Following over excavation,concentrations of BTEX were 0.087 mg/kg,0.026 mg/kg, <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />