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1l , TECHNICAL APPROACH SUMMARY ' The objectives of this additional site investigation are to further define the extent of impacted sod and groundwater beneath the site and adjacent areas To achieve these objectives, sod and ' groundwater samples will be collected for laboratory analysis from seven Geoprobe soil borings One sod boring will be drilled next to the former USTs, and six soil borings will be drilled approximately 100 to 120 feet from the former USTs The sod boring next to the former USTs will be advanced directly to the sandy gravel, second groundwater-bearing interval at ' approximately 43 feet bgs, for discrete groundwater sampling only Each of the other six soil borings will be advanced to approximately 25 feet bgs for soil and groundwater sampling from the water table ' Since the vertical extent of impacted soil has previously been defined in the vicinity of the former USTs, soil samples will not be collected from the proposed sod boring next to the former USTs ' From each of the sax peripheral soil borings, undisturbed soil samples will be collected at five- foot intervals using the Geoprobe sampler, and screened for any organic vapors using a photoionization detector(PID) Groundwater samples will be collected using a Hydropunch, ' driven into the groundwater-bearing sods Groundwater samples will be collected through the drive rods using a bailer Based on field observations and PID measurements, approximately two soil samples from each ' of the six peripheral soil borings, and all of the groundwater samples will be submitted for laboratory analysis Additional sod samples may be submitted for analysis, if required to adequately characterize the site Field observations and sample selection will be reviewed with the PHSIEHD inspector, prior to sample submittal to the lab Each soil and groundwater sample will be analyzed for TPH-as-diesel by EPA Method 8015M, and for TPH-as-gasoline, BTEX, MTBE, DIPS, ETBE, TAME, and TBA by EPA Method 8260B The methods and finding of the proposed work will be presented in an Environmental Site Investigation Report The report will be prepared and stamped by a state of California ' Registered Geologist Copies will be submitted to PHSIEHD and RWQCB Given standard turn-around times for regulatory review and approval of this work plan, and cost estimate preparation and pre-approval by the UST Cleanup Fund, the planning and permitting ' tasks could begin in October 2001 The time duration to secure encroachment permits from the city of Manteca and Union Pacific Railroad is unknown Once all permits have been secured, the final project report could be submitted approximately two months thereafter Given that the ' San Joaquin County Facilities Management Department has a limited budget to address environmental corrective actions at several other sites, the implementation of this project may be delayed until funding can be secured 1 1 3 1