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Revise Work Plan for Additional Groundwater nvestigation _ Quik Stop Market No. 132 3555 West Hammer Lane Stockton, California the possibility of cross-contaminating a deeper aquifer. The borehole will be drilled by a drilling contractor with a current C-57 license. All project work will be performed under the direction of 1 i a California Registered Geologist. �! The borehole location will be marked and cleared for underground utilities prior to drilling. The boring will be advanced with a direct push sampler, or equivalent. Continuous soil cores will be obtained by advancing a direct push sampler with acrylic liners into the subsurface. The soil core will be screened with a photo ionization detector (PID) for evidence of petroleum hydrocarbon r1 vapors. The field geologist will prepare a log of the subsurface conditions, and soil:samples will be classified in accordance with the Unified Soil Classification System (USCS). One or more soil samples will be selected from the boring for laboratory analysis. Upon retrieval, a 6-inch section L of the soil core liner will be cut at the selected sampling depth. The ends of the 6-inch tube L containing the soil to be tested will be covered with aluminum foil, capped with plastic end-caps, and taped shut. The tubes will then be labeled and placed in an iced cooler for transportation to p the laboratory. �d The boring will be advanced to a depth sufficient to allow water to collect in the boring. A shallow groundwater sample will be collected by installing a temporary well in the boring, and bailing a groundwater sample. The temporary well will be constructed of 1-inch diameter schedule 40 PVC with approximately 10 feet of 0.01-inch slotted casing for well screen. The temporary well will be in place long enough for sufficient water to accumulate for sampling, but less than 24 hours. The groundwater sample will be labeled, stored on ice, and shipped along with the soil sample(s), to the laboratory under proper chain of custody.for chemical analyses. After the groundwater sample has been collected, the temporary well will be removed from the boring. Additional depth discrete groundwater samples will be collected using a HydropunchTm tool, or equivalent. The boring will be backfilled to the surface with neat cement slurry after sampling is completed. Soil and groundwater grab samples will be analyzed by a California-certified laboratory for TPH-g by EPA Method 8015K BTEX by EPA Method 8020, and MTBE and other fuel oxygenates by EPA Method 8260. �j Soil cuttings and decontamination water generated during the investigation will be disposed of following receipt of the laboratory analytical results. The cuttings and decontamination water will be transported for disposal or recycling by a licensed hazardous waste hauler. Task 3. Prepare a Groundwater Investigation Report A report on the groundwater investigation activities will be prepared after all of the results are received from the analytical laboratory. The report will include: assessment procedures, a soil boring location map, soil boring log, a tabulated summary of analytical results, laboratory data sheets and chain of custody documentation, evaluation of the data collected, conclusions, and recommendations.