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SEC(i^ vmv.secor.com <br /> N C INTERNATIONAL 3017 Kilgore Road, Suite '100 <br /> ,J INCORPORATED Rancho Cordova , CA 95670 <br /> FR <br /> J 916-861 -0400 TEL <br /> 916-861 -0430 FAX <br /> August 4, 2006 <br /> AUG 0 ; 2006 <br /> Ms. Lori Duncan �\v� ENVIRONMENT HEALTH <br /> San Joaquin County PERMIT/SERVICES <br /> Environmental Health Department <br /> 304 East Weber Avenue , Third Floor <br /> Stockton , CA 95202 <br /> RE : Work Plan for Soil or Extraction and Air Sparge Feasibility Testing <br /> ARCO Service Stati n 548 <br /> 1612 West Hammer ane <br /> Stockton , California <br /> SECOR Project No. : 77 8.00. 0136 <br /> Dear Ms. Duncan : <br /> This document, prepared by SECOR International Incorporated (SECOR) on behalf of <br /> Atlantic Richfield Company (ARCO), a BP Affiliated Company, presents a work plan for <br /> conducting a soil vapor extraction (SVE) and air sparge (AS) feasibility test at the above- <br /> ( referenced site (Figure 1 ). This work plan was prepared in response to your letter dated <br /> June 12, 2006 (Attachment A). The purpose of this work plan is to present the plan for <br /> conducting the required feasibility testing . The results of this test will be used to determine <br /> if SVE/AS is an .appropriate remedial alternative for ARCO Service Station 548 . <br /> This work plan contains a site description, a summary of previous site assessments, a <br /> summary of known sensitive receptors in the area , a description of the current status of the <br /> dissolved-phase plumes , and details the scope of work proposed for the feasibility testing . <br /> SITE DESCRIPTION <br /> The site is located at the southwest corner of West Hammer Lane and Brentwood Drive in <br /> the City of Stockton , California (Figure 1 ). The site was formerly operated as an ARCO <br /> Service Station and AM/PM mini-mart. The site currently operates as a Valero gasoline <br /> service station and mini-mart. Current site facilities include four underground storage tanks <br /> (USTs); two pump islands , associated product lines and dispensers , and a convenience <br /> store. <br /> PREVIOUS ASSESSMENTS <br /> Site Investigations began in October 1990 with five soil borings (B- 1 through B-5) located <br /> around the USTs and product lines. Soil samples were collected and analyzed for <br /> petroleum hydrocarbons including total petroleum hydrocarbons as gasoline (TPHg) and <br /> benzene. Hydrocarbons were detected in six of the 18 samples collected . The highest <br /> concentrations detected were 1 ,400 milligram per kilogram (mg/kg) for TPHg and 1 .2 mg/kg <br /> for benzene. These detections were located in samples around the USTs at 30 feet and <br />