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Stantec Further Assessment Work Plan Stockton Charter Way Commingled Plume February 15, 2011 1.0 INTRODUCTION AND SITE INFORMATION On behalf of Atlantic Richfield Company (ARCO), Chevron Environmental Management Company (Chevron), Shell Oil Products US (Shell), and Sara Lee Bakery Group, Inc. (Sara Lee), Stantec has prepared this Further Assessment Work Plan (Work Plan) to address the data gaps identified in the Stockton Charter Way Commingled Plume Site Conceptual Model (SCM), dated January 14, 2011. The data collected based on this Work Plan will be used to prepare a Site delineation and assessment report for the former ARCO Service Station No. 2168, Chevron Facility #9-2033, former Texaco (Shell), and former Colombo/Toscana Bakery (Sara Lee), located at 441 West Charter Way, 508 West Charter Way, 440 West Charter Way, and 1444 South Lincoln Street, respectively in Stockton, California (collectively referred to as the Stockton Charter Way Commingled Plume Site or "Site"). The following Work Plan includes a brief description of the Site, basis for the proposed scope of work, detailed description of the proposed scope of work, reporting requirements, and an implementation schedule. Upon regulatory approval of this work plan, the scope of work will go to the UST Fund for their pre- approval prior to initiating any work. For subcontractor services needed to execute the scope of work, three bids will be obtained. 1.1 Background The Site is currently comprised of an active car wash facility (former ARCO Service Station No. 2168 - located on the northeast corner of the intersection of West Charter Way and Lincoln Street), an active Chevron-branded gasoline service station (Chevron Facility #9-2033 - located on the southwest corner of the intersection of West Charter Way and Lincoln Street), an ARCO- branded gasoline service station [former Texaco (Shell) - located on the southeast corner of the intersection of West Charter Way and Lincoln Street], and a storage warehouse [former Colombo/Toscana Bakery (Sara Lee) - located south of the former Texaco (Shell) on the east side of Lincoln Street]. A Site location map is included as Figure 1. In April 2010, the Regional Water Quality Control Board — Central Valley Region (RWQCB-CVR) classified the Site as a commingled plume; although a letter of commitment has not yet been issued by the Commingled Plume Fund, the four parties are working cooperatively. The Site is comprised of parcels 16503003, 14707607, 16504016, and 16503005, respectively. A Site plan is included as Figure 2. The Site lies at an elevation of approximately twelve feet (ft) above mean sea level on flat terrain. The area surrounding the Site is of mixed residential and commercial use. Former ARCO Service Station No. 2168 is currently comprised of an active car wash facility; no underground storage tanks (USTs) or fuel dispensers are present on the property. Chevron Facility #9-2033 is currently comprised of a station building, four fuel dispensers on two islands, and three USTs. Former Colombo/Toscana Bakery (Sara Lee) is currently comprised of a warehouse building; no USTs or fuel dispensers are present on the property. The ARCO- branded service station [former Texaco (Shell)] is currently comprised of a station building, a car wash, four fuel dispenser islands, and four USTs. This station is currently anticipated to be redeveloped during the summer of 2011. Site history and previous investigations are summarized in Appendix A. Tables 1 through 3 summarize the soil boring and well construction details, the historical soil analytical data, and the historical groundwater monitoring and analytical data. Stockton Charter Way Commingled Plume Further Assessment Work Plan.doc 1