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• RECEIVES FE9 2 6 2014 • Section 1.0 ENVIRONMENTAL HEALTH DEPARTMENT Introduction On behalf of Thrifty Oil Co. (Thrifty), Waterstone Environmental, Inc. has prepared this Report on Underground Storage Tank Removal and Associated Activities for former Thrifty Station No. 171 located at 1250 North Wilson Way, Stockton, California ("the Site"; Figure 1). The purpose of this report is to properly document the underground storage tank (UST) and fuel line removal activities conducted at the Site in January 2014,which include the soil sampling activities and analyses required by the San Joaquin County Environmental Health Department(SJCEHD) as part of the UST closure activities. 1.1 Site Description The Site is owned by Thrifty and was formerly leased and operated as a self-service gasoline sales facility by ARCO Products Company since May 1997 through early 2012, at which time ARCO's lease was not renewed. The Site is located on the southeast corner of Wilson Way and Harding Way in Stockton, California(Figure 1). The Site is generally square and about 12,300 square feet in size. The Site features a cashier's booth,three product dispenser islands, and three double-walled fiberglass USTs (Figure 2)which were installed in November 1994 and are located near the northeastern comer of the Site. The newer USTs (installed in 1994) replaced five steel USTs that were located • in the southwest portion of the Site. There was an equipment enclosure located in the southeast corner of the Site which housed the thermal oxidizer which was used at the Site to perform soil remediation through vapor extraction. The Site has been operated as a service station for at least the last 30 years. In May 2012, following ARCO's lease expiring Thrifty removed the contents of the USTs,the USTs and piping were triple rinsed, and appropriate measures were completed for in-place temporary closure of the two 12,000-gallon USTs and one 15,000-gallon UST and associated equipment. A mixed commercial-residential area surrounds the Site. To the north of the Site across East Harding Way is City Tune Up. To the northwest of the Site, on the corner of North Wilson Way and East Harding Way, are single-family residences and a vacant parking lot for the former Olde Hoosier Inn. Immediately east of the Site and beyond are single-family residences. To the west of the Site across North Wilson Way is a Kragen Auto Parts store. South of the Site is the Doz Roses Flower Shop. A no further action letter was received for the Site from the SJCEHD on February 22, 2012 (copy attached in Appendix A). • Thrifty Station No.401 1 Waterstone Environmental,Inc. February 2014 Project 13-140