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r ■� SECOI 1 www secoccom <br /> - INTERN. , , ZONAL 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 /> LL <br /> March 12 , 2008 <br /> MAR 1. 4 ?.008 <br /> Ms. Lori Duncan ENVIRONMENT HEALTH <br /> San Joaquin County Environmental Health Department PERNIMYSERVICES <br /> 600 East Main Street <br /> Stockton , California 95202 <br /> RE: Work Plan for Well Destruction <br /> Former ARCO Service Station No. 548 <br /> 1612 West Hammer Lane <br /> Stockton , California 95209 <br /> SECOR Project No. : 77BP . 00548 .02 .0136 <br /> Dear Ms. Duncan: <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 the San Joaquin County <br /> Environmental Health Department (SJC/EHD) letter dated February 13, 2008 (Attachment A) . This <br /> document presents a work plan to conduct well destruction at Former ARCO Service Station No . 548 <br /> (the "site") . The purpose of the well destruction is to remove groundwater monitoring well MW-3 prior <br /> to the widening of Hammer Lane. This work plan presents a brief site description , a summary of <br /> previous site assessments , and a detailed scope of work proposed for the well destruction . <br /> SITE DESCRIPTION <br /> The site is located at the southwest corner of West Hammer Lane and Brentwood Drive in Stockton , <br /> California (Figure 1 ) . The site is currently operating as a Valero retail gasoline station . A shopping <br /> center is located to the south and to west of the site, single family residences are located to the <br /> north, and a commercial property and a single story apartment building lie to the east. The site <br /> structures consist of a mini-mart, several USTs, two dispenser islands , and associated piping . <br /> According to Unites States Geological Survey topographic map dated 1975 , the elevation is <br /> approximately 10 feet (ft) above mean sea level on relatively flat terrain The nearest open bodies of <br /> water are Fivemile Creek/Slough , which is approximately 3,000 ft south of the site, and Mosher <br /> Slough, which is approximately 3,500 ft north of the site. A site plan is included as Figure 2. <br /> PREVIOUS INVESTIGATIONS <br /> Site investigations began in October 1990 with five soil borings (B-1 through B-5) located around the <br /> underground storage tanks (USTs) and product lines. Soil samples were collected and analyzed for <br /> petroleum hydrocarbons including total petroleum hydrocarbons as gasoline (TPHg) and benzene. <br /> Hydrocarbons were detected in six of the 18 samples collected. The highest concentrations <br /> detected were 1 ,400 milligram per kilogram (mg/kg) for TPHg and 1 .2 mg/kg for benzene. These <br /> detections were located in samples around the USTs at 30 ft and 40 ft, respectively. The <br /> investigation concluded that hydrocarbon-impacted soil was limited to the proximity of the UST <br /> complex. <br /> 548 Work Plan for Well Destruction.doc SECOR International Incorporated <br />