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11 i 1.0 Introduction P� 9 0 This Feasibility Study (FS) report has been prepared by Shaw Environmental, Inc. (Shaw), on behalf of Mr. Don Rodgers (the property owner), for The Transmission Shop site at Stockton, California. The purpose of this FS is to identify, evaluate, and select the remedial alternative to address the petroleum hydrocarbon contamination in the groundwater at the site. The presence of petroleum hydrocarbons in the groundwater was reportedly a result of historical leaks from a former underground storage tank (UST) on site. Following the guidance described in Section 2725 of the California Code of Regulations, Title 23, Division 3, Chapter 16, this FS is developed as a part of the Corrective Action Plan for the site and is issued in accordance with the request of the California Regional Water Quality Control Board, Central Valley (CVRWQCB) (2007a). 1.1 Site Location The site is located at 515 West Charter Way, less than 1,000 feet east of Interstate Highway 5, in the city of Stockton, California. A Site Location Map is shown on Figure 1. Situated on the northwest corner of the intersection of Lincoln Way and West Charter Way, the site resides within a mixed commercial and residential area. There are former or current retail service stations at each corner of the intersection. Figure 2 shows the current site layout and its immediate surrounding area. 1.2 Document Organization The following sections of this FS are organized as such: • Section 2.0 provides further description of the site, including its environmental setting and local geology and hydrogeology. A brief narrative of the site investigation history is also presented therein. • Section 3.0 describes the treatment objectives for the onsite groundwater based on the nature and the approximate extent of the contamination. Section 4.0 discusses the identification and evaluation of treatment alternatives that are potentially applicable and appropriate for the site. • Section 5.0 presents a comparison of the alternatives identified in Section 4.0 and the selected alternative based on results of the comparison. • Section 6.0 summarizes conclusions and recommendations for the site. 1 FS_ Onsite Petroleum Hydrocarbon Remediation.doc 1-1 Shaw Environmental, Inc.