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4 Stantec Stantec Consulting Services Inc. 3875 Atherton Road, Rocklin, California 95765 May 30, 2018 File: 185703766 Mr. Alan Buehler, P.G. Central Valley Regional Water Quality Control Board 11020 Sun Center Drive #200 Rancho Cordova, CA 95670 Reference: Data Gap Assessment Report, Former Chase Chevrolet, 424 North Van Buren Street, Stockton, California Dear Mr. Buehler: Stantec Consulting Services Inc. (Stantec), on behalf of the City of Stockton (the City), has prepared this Data Gap Assessment Report for the former Chase Chevrolet Property historically located at 424 North Van Buren Street (the Site, with current address of 310 West Fremont Street), in Stockton, California. The scope of work detailed herein was completed as detailed in Stantec's Data Gap Assessment Work Plan and Path to Closure Review dated January 2, 2018 (Work Plan) and approved by the Central Valley Regional Water Quality Control Board (CVRWQCB) in correspondence dated January 4, 2018. The Work Plan identified data gaps impeding Site closure under the California State Water Resource Control Board's (SWRCB's) Low-Threat Underground Storage Tank Case Closure Policy (LTCP; SWRCB, 2012). The Work Plan outlined the following activities to address data gaps: (1) complete an updated sensitive receptor survey (SRS); (2) evaluate concentrations of dissolved-phase petroleum hydrocarbons in Site groundwater; (3) evaluate the direct-exposure pathway by evaluating concentrations of petroleum hydrocarbons in shallow soils; and (4) assess potential vapor intrusion risk via collection of soil vapor samples. This report presents soil, soil vapor, and groundwater chemical data obtained during the investigation. BACKGROUND Site Description - The Site is located at the southeast corner of the intersection of W. Fremont Street and North 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 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 North Van Buren Street to the west, West Fremont Street to the north, North Madison Street to east, West Lindsay Street to the south, and was divided by North Munroe Street. Following Site redevelopment, North Munroe and West Lindsay Streets no longer extend into the property. Fuel Release Identification - In 1986, a 1,000-gallon underground storage tank (UST) was removed from the western portion of the former Chase Chevrolet property by Falcon Energy Associates, and the UST Design with community in mind