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r 0%. N <br /> % SECOlk-0 www.secor.com <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C O R INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> August 9, 2007 <br /> 1 u cGp� <br /> Ms. Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street { . <br /> Stockton, California 95202 <br /> RE: Work Plan for Soil Vapor Survey <br /> ARCO Service Station No. 2186 <br /> 3212 North California Street <br /> Stockton, California I <br /> SECOR Project No.: 778P.02186.02.0136 <br /> Dear Ms. McCartney: <br /> This work plan has been prepared by SECOR International Incorporated (SECOR) on behalf of <br /> Atlantic Richfield Company (ARC), a BP Affiliated Company, in response to a San Joaquin <br /> County Environmental Health Department (SJCEHD) letter dated June 7, 2007, a copy of which <br /> is included in Attachment A, to conduct a soil gas survey at 3212 North California Street, <br /> Stockton, California (the "site"). The site location is shown on Figure 1. <br /> The vapor probes will be used in a vapor intrusion pathway evaluation. <br /> SITE DESCRIPTION <br /> ARCO Service Station No. 2186 is located on the southeast intersection of North California <br /> Street and Alpine Street in Stockton, California (Figure 2). The site currently operates as a <br /> gasoline service station and mini-mart. The site dispenses gasoline from two underground <br /> storage tanks (UST's) located near the northern portion of the property. Facilities include two <br /> 20,000-gallon, double-wall fiberglass gasoline USTs with associated product lines, and two k <br /> dispenser islands. The majority of the subject property is paved with an asphalt parking lot and <br /> common landscaping. According to the United States Geological Survey (USGS) topographic <br /> map dated 1987 the elevation of the site is approximately 14 feet above mean sea level on a <br /> relatively flat terrain. The surrounding properties consist primarily of commercial businesses, <br /> single family residential homes, and a city park. <br /> SITE BACKGROUND <br /> Based on information provided by ARC, historically there were three USTs at the site (one <br /> 8,000-gallon tank storing super unleaded gasoline, and two 10,000-gallon tanks storing regular <br /> unleaded gasoline). <br /> From August to September of 1995, EMCON of Sacramento, California, supervised the drilling <br /> of six vertical soil borings (B-1, B-3, B-4, B-5, B-7, and B-8) and two 45-degree angle soil <br /> borings (B-2 and B-6). Three soil borings B-1, B-4, and B-5 were converted to monitoring wells <br /> MW-1 through MW-3, respectively. Three soil borings B-3, B-7, and B-8 were converted to dual- <br /> completion vapor extraction wells (VW-1 through VW-3, respectively). <br /> In October 1996, EMCON supervised the drilling of one vertical soil boring B-9. B-9 was <br /> subsequently converted to monitoring well MW-4. Gasoline Range Organics (GRO) was <br /> detected in soil borings B-1, B-3, and B-7 at concentrations ranging from 1.1 milligram per <br /> 2186 SVI 8-07.doc SECOR International Incorporated <br />