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WORK PLAN FOR LIMITED SITE INVESTIGATION Sandhu Property Tracy, California October 22, 2021 Terracon Project No. NA217074 Responsive Resourceful Reliable 3 2.4 Permitting In conjunction with this Work Plan, Terracon has completed a SJCDEH Site Mitigation Well & Boring Permit Application. See attached. 2.5 Utility Location and Geophysical Survey Following SJCDEH approval of this Work Plan, and no later than 72 hours prior to intrusive activities, Terracon will contact Underground Service Alert (USA) 811 North to arrange for underground utility locates at the site. To further evaluate the underground utilities at the site, a geophysical survey will be performed in the vicinity of each of the proposed sample locations where mechanical drilling will be performed. Terracon will utilize ground-penetrating radar (GPR) to detect any concealed utilities at each select sampling location. GPR activities will be completed on the first day of planned drilling activities. 2.6 Sampling and Laboratory Analytical Program 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. One soil sample will be collected from each of nine shallow and three deep borings in the upper 0.5 feet of soil. A second soil sample will be collected at 0.5 to 1 foot below grade surface (bgs) and will be submitted to the laboratory on hold. Two additional soil samples will be collected from each of the three deep borings (20 feet bgs) and submitted for laboratory analysis of petroleum hydrocarbons to investigate the former crude oil release reported east of the site. Refer to the attached Exhibit 1 for the proposed sample locations. The proposed sampling locations may be modified in the field to account for utility clearance, access limitations, and/or site conditions. The client will be notified of any significant modifications to the sampling locations. The sampling and analytical program, including the number and types of samples and laboratory analyses, is detailed in the attached Table 1. Investigation and sample collection procedures will be conducted in accordance with local industry standard practices. Temporary investigation locations will be plugged and abandoned in accordance with applicable local County requirements. Investigation-derived waste (IDW) resulting from the LSI will be handled per state requirements. IDW will be transported to and disposed at an approved receiving facility per federal and state regulations. The estimated fee assumes transport and disposal of one 55-gallon drums of non-