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11 January2021 AdvancedGeo Project No. 20-6274 An Employee-Owned Company Page 2 of 4 Based on this information, AGI proposes to investigate the areas between the rail spur and ASTs on the east side of the property, within the AST secondary containment structures located inside the warehouse building and south of the building, and adjacent to the sumps located inside the warehouse building. 2.0. SCOPE OF WORK AND PROCEDURES AGI proposes to advance a total of eight (8) soil borings at the site. Two (2) borings will be advanced between the rail spur and ASTs on the east side of the property to total depths of 35 feet below surface grade (bsg) for collection of soil and groundwater samples; three (3) borings will be advanced withing the AST secondary containment structures to maximum depths of seven feet bsg for collection of soil samples; and three (3) borings will be advanced to maximum depths of seven feet bsg adjacent to each sump located inside the building for collection of soil samples. Proposed soil boring locations are depicted in Figure 2. The proposed scope of work includes the following tasks. 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment drilling permits will be obtained from the EHD. Also, a site- specific Health and Safety Plan will be prepared prior to field work. Prior to mobilization, each soil probe boring location will be clearly marked, and a utility clearance obtained through Underground Service Alert (USA/511). The EHD will be contacted at least 72 hours prior to conducting investigation activities to coordinate a grout inspection. 2.2. SOIL BORING ADVANCEMENT AND SAMPLING AGI proposes to advance the soil borings utilizing a van or truck-mounted Geoprobe 5400 direct-push probing unit equipped with 1.25-inch diameter probing rods. Shallow borings may be advanced by hand methods. The Geoprobe advances soil probe borings using a hydraulic hammer to drive sampling tools to specified depths. Soil samples will be collected at discrete five-foot intervals beginning at five feet bsg using a 1.45-inch Geoprobe soil sampling assembly loaded with a two-foot acetate liner. Upon sample retrieval, a selected portion of the liner will be cut, and the ends will be covered with Teflon sheets, capped, and sealed with tape. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-custody procedure to a California Environmental Laboratory Accreditation Program (ELAP)-certified laboratory. Each sample will be labeled with boring designation, depth, time, date, and sampler's initials. Soils encountered in the borings will be visually classified by AGI personnel in accordance with the Unified Soil Classification System (USCS). Additionally, soil samples will be field-screened for presence of volatile organic compounds using an