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Stantec Well Restoration and Well Destruction Report Stockton Charter Way Commingled Plume No. CP0057 November 15, 2011 1.0 INTRODUCTION AND SITE BACKGROUND 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 Well Restoration and Destruction Report(Report) to summarize the field activities recently implemented as described in previous work plans. Stantec oversaw the restoration of groundwater monitoring wells SMW20-83.5 and SMW-23 according to the Well Reconfiguration Work Plan, dated March 15, 2011, after the property located at 378 West Charter Way was redeveloped. Stantec also oversaw the well destruction of SMW-7, SMW-18- 80, and SMW-18-120 according to the Well Destruction Work Plan, dated August 12, 2011, and the Addendum to Well Destruction Work Plan, dated September 15, 2011. The following Report includes a brief description of the site, a summary of the well restoration activities, and a summary of the well destruction activities. 1.1 Site Background The site consists of 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 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 CRWQCB-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. Table 1 summarizes the soil boring and well construction details. Stockton Charter Way CP -Well Restoration and Well Destruction Report.doc 1