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WORK PLAN FOR LIMITED SITE INVESTIGATION Sandhu Property Tracy, California October 22, 2021 Terracon Project No. NA217074 Responsive Resourceful Reliable 4 hazardous IDW. Client or its authorized agent will be responsible for signing the waste manifest, as required, or authorizing Terracon to sign on its behalf. Soil Borings No later than 48 hours to the start of field work, Terracon will notify SJCDEH of our proposed work day and confirm that a representative of the SJCDEH will be available for a backfilling inspection. Nine 1-foot soil borings will be advanced using a hand auger, one soils sample will be collected 0 to 0.5 foot below grade a second sample will be collected 0.5 to 1 foot below grade. Three soil borings will be advanced on the site using a track-mounted, direct push drill rig to depths of approximately 20 feet bgs, one soil sample will be collected at 0 to .05 foot below grade a second sample will be collected 0.5 to 1 foot below grade a third sample will be collected form the deep boring below grade determined onsite. Drilling activities will be performed by a California C-57 licensed driller. During drilling activities, soil samples will be continuously collected to document lithology, color, and relative moisture content. In addition, the soil samples will be field screened using sensory methods and an organic vapor meter (OVM) equipped with a photoionization detector (PID) to detect the presence of organic vapors. To address the historical agricultural land use environmental concern, soil sampling will be conducted in general accordance with the Interim Guidance for Sampling Agricultural Properties Third Revision, prepared by the Department of Toxic Substances Control (DTSC), dated August 7, 20081. The depth of soil samples collected from the deep soil borings will be determined in the field based on PID readings, changes in lithology, or at the capillary fringe and submitted for laboratory analysis. Additional soil samples may be collected from the intervals exhibiting a change in lithology, and/or from the bottom of the boring. These soil samples will be placed on hold for potential contingent analyses if recommended based on review of the initial analytical results. The soil samples will be collected and placed into laboratory-prepared containers. The containers will be labeled and placed on ice in a cooler which will be secured with a custody seal. The samples and completed chain-of-custody forms will be transported to the selected analytical laboratory for analysis within 5-day turnaround following receipt of the samples by the laboratory. 1 https://dtsc.ca.gov/wp-content/uploads/sites/31/2018/09/Ag-Guidance-Rev-3-August-7-2008-2.pdf