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Jamar Service Station Workplan for Add?ON--Site Assessment Activities November 11,2019 • Utility Locating. Prior to drilling, ATC will mark the proposed drilling locations described in this workplan and use a private utility locator to clear the location. Underground Service Alert (USA) will be called to allow the local underground utility companies to identify the location of any utilities in the area of the proposed work. The borings will be cleared to 5 feet bgs. Soil boring and well locations may require adjustment due to the presence of underground utilities and/or overhead lines. • Advancement of Soil Borings. ATC will contract with a C-57 licensed drilling company to advance one off-site boring. The off-site boring will be advanced downgradient of monitoring wells MW10 and in the vicinity of CPT-5 to evaluate the lateral and vertical extent of the groundwater plume. Proposed boring location is shown on Figure 2. The boring will be advanced using cone penetrating test (CPT) methods. The CPT boring will be advanced to an estimated depth of 110 ft bgs (or refusal). The boring will be advanced using a direct push CPT rig that will log soil lithology from approximately five feet bgs to the maximum explored depth. A groundwater sample will be collected from a separate borehole advanced adjacent to the CPT boring using a modified HydroPunch®sampler. Prior to groundwater sampling, a water level meter will be used to confirm that the drive rods do not contain water. The sampler will then be driven to approximately three feet below the desired sampling depth, and retracted three feet to expose the disposable schedule 20 polyvinyl chloride (PVC) screen and allow for groundwater to enter the HydroPunch® sampler. The water sample will be collected by lowering a %-inch diameter stainless steel bailer through the drive rods to groundwater. The groundwater will be bailed from the drive rods, decanted from the bailer into 40-milliliter (ml) volatile organic analysis (VOA) vials. Following the collection of the sample, the drive rods will be retracted, leaving the disposable drive tip and four-foot length of PVC well screen in the hole. Following completion, the CPT soil boring will be grouted through the drive rods from the total depth explored to surface grade with neat cement. • Sample Analysis The groundwater sample from the soil boring will be immediately placed in a cooler with ice and delivered under chain-of-custody documentation to a State-certified analytical laboratory. The groundwater sample will be analyzed for TPHg by EPA Method 8015, BTEX, and fuel oxygenates by EPA Method 8260. 3.2 SCHEDULING Upon approval of this workplan, ATC will apply for encroachment permits and/or off-site access agreements for the off-site borings. After encroachment permits and/or off-site access agreements are received, the boring permits will be obtained from the SJCEHD and ATC will schedule drilling activities. 2