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DATA GAP ASSESSMENT WORK PLAN AND PATH TO CLOSURE REVIEW Chase Chevrolet, 424 N. Van Buren Street Background January 2, 2018 groundwater gauging data is included in Appendix C and the most recent groundwater gradient evaluation figure from October 2003 is included in Appendix D. 2.4 MUNICIPAL WELL SURVEY As of 1996, one municipal water supply well and tank owned and operated by the California Water Service Company was identified approximately 1,100 feet west of the site at the intersection of W. Lindsey and N. Edison Streets. The next closest well was located 2,600 feet northeast of the site on E. Poplar Street in between N. San Joaquin and N. Hunter Streets (AGE, 1996). 2.5 SUMMARY OF HISTORICAL ASSESSMENT ACTIVITIES The following paragraphs provide a brief summary of site investigations and remedial efforts completed at the site, as summarized from Advanced GeoEnvironmental, Inc. (AGE, 2003), and a letter from the CVRWQCB dated October 12, 2016. In May 1986, four underground storage tanks (USTs nos. 3 through 6) were removed by Falcon Energy Associates (FEA) from a shared excavation cavity located north of the former repair shop (Figure 2). UST nos. 3 and 4 were 2,000-gallon gasoline and motor oil tanks, respectively, UST No. 5 was a 2,000-gallon transmission fluid tank, and UST no. 6 was a 5,000-gallon gasoline tank. The USTs are located on the eastern block of the former Chase Chevrolet site. Hydrocarbon- impacted soil was encountered during tank removal efforts. In November 1992, three additional USTs (USTs nos. 1, 2, and 8) containing waste oil (USTs 1 and 2) and solvents (UST No. 8) were removed by FEA from separate excavations located west, east, and south of the former repair shop, respectively. These three tanks were reported to be in poor condition at the time of removal. Hydrocarbon-impacted soil was encountered in each excavation area. Between 1990 and 1994, five groundwater monitoring wells and two soil borings were installed on-site. During installation hydrocarbon-impacted soil and groundwater were encountered. In June and July 1995, 17 soil borings were advanced at the site. Four borings were advanced near each UST cavity from UST nos. 1, 2, and 8; five borings were advanced near the UST cavity from UST nos. 3 through 6. Soil samples were collected from 13 borings, and groundwater samples were collected from five borings to define the extent of impacted soil and groundwater. In September 1995, monitoring wells MW-11, MW-12, and MW-13 were installed at the site. In November 1995, MW-18 was installed immediately east of the site, on Madison Street. In January 1996. Two in-situ air sparging wells (IAS-1 and IAS-2) were installed at the site. Stantec bm \ \us1312- f02 \workgroup\ 1857 \ active \ 185703766 \ 05_report_deliv \ deliverable \ work_plan \185703766_20180102_424_van_buren_work_plan_final.docx 2.2