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SECOR <br /> International Incorporated <br /> April 10, 2002 <br /> Project 77BP.43323.00.0230 <br /> Mr. Sam Savig :F71 , <br /> San Joaquin County Public Health Services APR 12 2002 <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor ENV€iA.,i.4 v�c iq I HEALTH <br /> Stockton, California 95202 PERIv11T/IERVICES <br /> Re: Site Assessment Report <br /> Arco Service Station#5450 <br /> 1617 West Fremont Street <br /> Stockton, California <br /> Dear Mr. Savig: <br /> This letter was prepared by SECOR International Incorporated (SECOR) on behalf of <br /> Atlantic Richfield Company, to document the drilling of three soil borings at the site <br /> referenced above (Figures 1 and 2). The purpose of this work was to evaluate the <br /> horizontal and vertical extent of hydrocarbons in soil and to evaluate if groundwater <br /> . beneath the site has been impacted. This work was performed as described in the Work <br /> Plan for Site Assessment, dated November 20, 2001. The Work Plan was approved by <br /> San Joaquin County Public Health Services (SJCPHS) as indicated in their letter dated <br /> November 26, 2001 (Attachment A). <br /> SITE DESCRIPTION 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, in Stockton, CA. The site is an operating gasoline <br /> service station and AM/PM mini-mart. Currently, site facilities include three gasoline <br /> underground storage 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 mg/kg, <br /> respectively, near the southwestern dispenser island. Approximately 35 cubic yards of <br /> soil was removed during over excavation activities of the impacted soil. Following over <br /> excavation, concentrations of BTEX were 0.087 mg/kg, 0.026 mg/kg, 0.0064 mg/kg, and <br /> 3017 Kilgore Road, Suite 100, Rancbo Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor,com <br />