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Closure Summary Report Former TRACY DINER 95 West I Vh Street, Tracy, California 1.0. INTRODUCTION At the request of Mr. Joe Panetta, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Closure Summary Report (CSR) summarizing all field activities conducted at 95 West 11 th Street, Tracy, California (site). This CSR was prepared in accordance with a San Joaquin County Environmental Health Department (EHD) directive letter, dated 13 May 2009 (Appendix A). Based on the results of subsurface investigation of the underground storage tank (UST) area at the site, it is AGE's opinion no further investigative or corrective action be required for this facility. The site setting is illustrated on Figure 1; prominent features on the subject property are illustrated on Figure 2: underground utilities at the subject property and the vicinity are illustrated on Figure 3. This CSR has been prepared in accordance with the California Regional Water Quality Control Board (CVRWQCB) - Central Valley Region guidelines (Tri -Regional Board Staff Recommendations For Preliminary Investigations and Evaluation of Underground Tank Sites) for No Further Action Requests (Appendix B). ( ; 2.0. BACKGROUND The former Tracy Diner is situated at the intersection of West 11 `h Street and Adams Street in a business/agricultural arca of central Tracy, California. The site is located in an area of low topographic relief, at an elevation of approximately 18 feet above mean sea level (MSL), as depicted on the Tracy Quadrangle (7.5 -Minute USGS Topographic Series, 1968, photo revised 1976; see Figure 1). The San Joaquin County Assessor's Office lists the site's boundaries as Parcel 27 on Map 233 in Book 130 (APN 233-130-27). According to San Joaquin County Assessor's Office and the San Joaquin County Recorder's Office records, a Phillips Service Station operated at the site from approximately 1956 through the early 1970s --- Gill's Flying A/Gill's Phillips 66 Gas (through 1969) and Art's Phillips 66 Gas (1969- 1970). The site address for. the former service station was historically identified as 33 West 11th Street. The APN is currently 233-130-27 and was formerly 233-130-24, 25 and 26; the former service station has been identified on the western -most parcels 24 and 25. The eastern -most portion of the property had historically operated as a restaurant, "The Diner". The site is currently a commercial office building. 2.1. UNDERGROUND STORAGE TANK REMOVAL A gasoline underground storage tank (UST) reportedly operated on the site for approximately 30 years, from 1940 tintil 1970. The UST system is assumed to have been removed after 1970, Advanced GeoEnvironowntal, Inc.