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October 5,2020 Page 3 geophysical survey and additional soil borings to investigate an approximately 4 ft by 40 ft section of concrete floor inside the vacant shop building that may have been used as a vehicle repair pit. The shop building vicinity will also be investigated for evidence of a potential waste oil tank that may have been associated with the former auto repair facilities at the site. C. PROPOSED SCOPE OF SERVICES CA Limited Geophysical Survey SCHUTZE & Associates, Inc. will conduct a limited geophysical survey at the location of the former auto shop. The areas included will be (1) the apparent former mechanics pit to check for potential subsurface objects such as buried drums and (2) a 10-ft swath adjacent to the outside perimeter of the building on all sides to check for a potential waste oil UST. The proposed boring locations within and near the shop building will be cleared for utilities. The survey will be conducted using ground penetrating radar (GPR) and metal detection equipment. Detected features will be marked on the ground surface and documented on a scaled field map. C.2 Additional Soil Borings SCHUTZE & Associates, Inc. will conduct the following: • Obtain required permit(s). The San Joaquin County Environmental Health Department (SJCEHD) including the submission of a project Work Plan, site map and Health & Safety Plan (H&SP). • Mark the proposed soil boring locations. Contact Underground Services Alert (USA) to clear the boring locations for underground utilities (the proposed boring locations will also be included in the geophysical survey). • Provide notification to the SJCEHD and other agencies (as required) of the scheduled field work. • Prepare and implement a site-specific H&SP for the project. • Advance 1 to 2 soil borings using a dual-wall Geoprobe rig to groundwater, 60 feet below ground surface (ft bgs) or drill refusal, whichever occurs first. Groundwater is expected between approximately 47 and 49 ft bgs. If groundwater is not encountered, borings may be advanced to additional depths, contingent on field conditions and available time. The two deeper borings will be advanced adjacent to the truck repair shop exterior. • Advance up to 4 soil borings using a dual-wall Geoprobe rig to 15 ft bgs or drill refusal, whichever occurs first. The four shallower borings will be advanced adjacent to the suspected vehicle repair pit in the shop interior. • Recover the soil cores in 1.5-inch-diameter acetate liners to be observed by the field geologist. Continuously log the encountered soil and note visual signs of contamination or unusual odors in soil boring logs. • Field-screen the recovered soil cores for VOCs using a portable photo ionization SCS700.4—2327 East Mariposa Road