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Partner will perform the following tasks for the investigation: • Prepare a site-specific health and safety plan; • Notify Underground Service Alert of Northern California (USAN) a minimum of two business days prior to field activities to clear public utilities; • Secure the necessary drilling permit from the SJCEHD; • Notify the applicable regulatory agencies a minimum of 24 hours prior to drilling/backfilling activities; • Scan for the location of private utilities and clear boreholes of utility lines through a geophysical survey. Boring placement will be modified as necessary based on the geophysical survey results to avoid damaging underground features. Additionally, to the extent practical based on subsurface lithology, clear boring locations using hand tools; • Advance five borings in the vicinity of the current on-site USTs and fuel dispensers (based on data from the geophysical survey and/or site observations) to a terminal depth of 20 feet bgs, collecting soil samples at 2, 5, 10, 15, and 20 feet bgs and a grab groundwater sample at the terminal depth; • Drilling and sampling equipment will be pre-cleaned prior to arriving on-site. Downhole equipment and materials will be decontaminated in a detergent/tap water and double-rinsed with tap water or with a pressure washer between samples and/or borings to reduce the potential for cross-contamination. Soil samples will be collected using a 4-foot long by 2.25-inch diameter MacroCore sampler with a 4-foot long acetate liner, which was advanced by the direct-push drill rig using 4-foot long by 1.5-inch diameter drill rods.The sampler will be driven into the subsurface to allow undisturbed soil to enter the open MacroCore barrel and retrieved in 4-foot intervals to recover the soil-filled liners. A lengthwise section of each acetate liner was removed with a splitting tool to expose the soil. The soil column was visually inspected for discoloration, monitored for odors, and classified in accordance with the Unified Soil Classification System (USCS). Select intervals were placed in sealable plastic bags and field-screened with a photoionization detector (PID) calibrated to isobutylene. Soil depths selected for laboratory analysis will be sampled directly from the liners using a disposable plastic syringe and retained in one methanol-preserved and two sodium bisulfate-preserved volatile organics analysis (VOA) vials in accordance with United States Environmental Protection Agency(EPA) Method 5035 sampling protocol. A sample will also be collected by transferring soil into a laboratory-supplied,four-ounce, wide-mouth, unpreserved glass jars, which are sealed with a threaded, Teflon-lined lid.The jars will be filled with soil to capacity to minimize headspace and reduce the potential for volatilization. The jars and VOA vials will be labeled for identification and stored in an iced cooler; • Up to 25 soil samples and five groundwater samples will be prepared for laboratory analysis. Based on field-screening results, one soil sample per boring (five soil samples total) and each groundwater samples (five groundwater samples total) will be analyzed for carbon chain total petroleum hydrocarbons (TPH-cc) via EPA Method 8015 and VOCs via EPA Method 8260; • After sampling activities, the borings will be backfilled per SJCEHD requirements and capped with concrete; • Data will be compared to applicable screening criteria and a report will be prepared summarizing the field activities, methods, and findings; and • Submit the pertinent data to the SJCEHD for review. Page 3 PARTNER