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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 2.0 BACKGROUND 2.1 SITE DESCRIPTION The site is located at the southeast corner of the intersection of W. Fremont Street and N. Van Buren Street (Figures 1 and 2). In 2004, the site and several adjacent properties were purchased by the City and developed as part of the Stockton Arena and Banner Island Ballpark project. A multistory parking garage with ground level retail units facing Fremont Street that is attached to the Arena covers the majority of site. Historically, the site was the location of a Chase Chevrolet auto dealership and repair center. The Chase Chevrolet auto dealership spanned a two-block area that was bounded by N. Van Buren Street to the west, W. Fremont Street to the north, N. Madison Street to east, W. Lindsay Street to the south, and was divided by N. Munroe Street. On the currently developed property, N. Munroe and W. Lindsay Streets no longer extend into the property. 2.2 FUEL RELEASE IDENTIFICATION In 1986, one 1,000-gallon underground storage tank (UST) was removed from the site by Falcon Energy Associates on the western portion of the former Chase Chevrolet property. Petroleum hydrocarbon-impacted soil was encountered beneath the UST during the removal of the tank. The UST was not replaced (AGE, 1996). The CVRWQCB opened an investigation at the site (Case #390567) due to the reported petroleum hydrocarbon release from the fuel UST on September 10, 1990. Additional USTs were removed from the eastern side of the former Chase Chevrolet property (discussed below in Section 2.5); however these USTs are not the focus of Case #390567. 2.3 GEOLOGY AND HYDROGEOLOGY 2.3.1 Geology Previous investigations at the site have identified predominantly fine grained materials (sandy silt, silt, and clay) to depths of approximately 15 to 19 feet below ground surface (bgs), underlain by coarse grained material (silty sand to sand) to a depth of approximately 40 feet bgs, followed by clay to silty clay material to total depth explored of approximately 50 feet bgs. Boring logs and cross-sections that were in the available historical record have been included as Appendix B. 2.3.2 Hydrogeology Groundwater has been encountered at the site at depths of approximately 15 to 25 feet bgs. The predominant groundwater gradient flow direction is to the east-northeast. Historical Stantec bm \\us1312- f02 \ workgroup\ 1857 \ active \ 185703766 \ 05_report_deliv \ deliverable \work_plan \ 185703766_20180102_424_van_buren_work_plan_final.docx 2.1