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0 <br /> Work Plan - PG & E Trench Project <br /> Byron Road, Tracy, California <br /> At two locations, where junction vaults will be installed by PG&E, soil <br /> samples will be collected from the approximate depth of 12 feet bgs. Based <br /> on the review of previous reports the groundwater level in the vicinity of the <br /> site is between 5 and 10 feet bgs. <br /> 2. The borings will be logged by a field scientist, using visual classification <br /> methods. The cuttings from each boring will be checked with a <br /> photoionization meter (PID) for the presence of hydrocarbons. <br /> 3. At least one soil sample and one groundwater sample will be collected from <br /> each boring. The soil samples will be collected in cleaned, brass or stainless <br /> steel tubes. Water samples will be collected from the borings using <br /> disposable bailers, and decanted into appropriate laboratory containers. The <br /> ECM Standard Operating Procedures (SOPs) for this project are attached, <br /> Soil Sampling and Ground Water Sampling. <br /> 4. Selected soil and groundwater samples will be analyzed for TPH(G), TPH(D), <br /> TPH(MO) and/or BTEX compounds by a State certified laboratory using EPA <br /> standard methods. Some samples may be analyzed for polynuclear <br /> aromatics (PNAs). EPA methods that may be selected for this project include <br /> 8015/8020, 8270, and 82608. <br /> 5. The borings will be abandoned after drilling by placement and hydration of <br /> bentonite chips. The chips will be placed in lifts of 3 to 4 ft each, and <br /> hydrated with 3 to 5 gallons of water. The borings will be filled to within 2 <br /> to 3 ft of rough surface grade. The final lift of bentonite chips will be <br /> hydrated with sufficient water so that the bentonite fill material has visible <br /> standing water for at least 10 minutes. Boring abandonment will be <br /> observed by the San Joaquin County EHD representative. <br /> ECM has enclosed fees for the planned work, as well as the boring application <br /> form, Licensed Contractor's Declaration, and master record forms. The drilling <br /> contractor is Western Strata Exploration of West Sacramento, California. [A <br /> contractor designation may already be in the County files for Western Strata.] <br /> ECM will complete a letter report presenting the results of this investigation to <br /> PG&E within 5 days of receipt of the laboratory data. The letter will include <br /> recommendations for the implementation of site-specific health and safety <br /> measures for the trenching project. No subsequent investigation work is planned. <br /> Page 2 of 3 <br />