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WORK PLAN FOR ADDITIONAL SITE INVESTIGATION Irerracon Vacant Property Tracy, California April 16, 2021 Terracon Project No. NA197074B Advancing five soil borings (SB17, and SB19 through SB22) to a depth of approximately 30 feet bgs at locations shown on Exhibit 3. Up to two soil samples will be collected from each 30-foot deep soil borings based on visual or field screening observations; Advancing four soil borings (SB23 through SB26) to a depth of approximately 2 feet bgs in the area of the former soil stockpiles; Field screening and logging of soils during drilling by an experienced field scientist under the direction of a California licensed Professional Geologist; Collection of soil and groundwater samples in laboratory-provided containers, with preservation as required for soil and groundwater samples, and following chain-of-custody protocols delivering the samples to a California Environmental Laboratory Accreditation Program (ELAP) certified laboratory; and, Analyses of soil samples and groundwater samples for total petroleum hydrocarbons as gasoline, diesel, and motor oil (TPH-g, TPH-d, and TPH-mo) by EPA Method 8015M, and volatile organic compounds (VOCs) by EPA Method 826013; and, 2.2.3 Sampling and Laboratory Analytical Program A total of 10 soil borings will be advanced at the site. A description of the sampling points, construction and sampling is presented below. Refer to the attached Exhibit 3 -Site Detail for the proposed boring locations. Drilling services for the proposed soil borings will be performed by a State-of-California C-57 licensed driller using a truck- or track-mounted direct-push technology (DPT) rig with capabilities to also use hollow-stem auger drilling if refusal is encountered using DPT. The drilling will be performed under the supervision of a Terracon environmental professional and the oversight of a Terracon licensed Professional Geologist (P.G.). Soil samples will be collected continuously using single-use acetate liners to document lithology, color and relative moisture content. In addition, the samples will be field screened using sensory methods and a photoionization detector (PID) to detect the presence of total organic vapors. Drilling and sampling equipment will be cleaned using an Alconox wash and potable water rinse prior to the beginning of the project and before collecting each soil sample. Two soil samples will be collected from each boring and submitted for laboratory analysis. The soil samples submitted for laboratory analysis will be collected from the zones exhibiting the highest volatile vapor readings or the interval of most-likely environmental impact as determined in the field by the sampling professional, such as the capillary fringe zone (if applicable), the intervals exhibiting a change in Iithology, and/or from the bottom of the boring. Responsive■ Resourceful ■ Reliable 5