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PRE-TANK REPLACEMENT SITE ASSESSMENT WORK PLAN. %W 1071 North Main Street,Manteca,California Yr 3.0 PROPOSED WORK PLAN 41.0 A total of thirteen soil borings will be advanced according to San Joaquin County guidelines at the locations shown in Figure 2. Four soil borings will be advanced to an •- estimated minimum depth of 20 feet below grade in the area of the existing and proposed underground fuel storage tanks. Eight soil borings will be advanced to estimated depths of 10 feet below grade around the four dispenser islands. One soil boring will be drilled adjacent to the existing product line locations. Soil borings will be advanced using a 8- inch diameter hollow stem auger. All soil borings, upon completion, will be grouted to surface with a cement bentonite slurry. Soil samples will be collected using brass liners in a California-Modified split-barrel sampler. Proposed methods are attached in Appendix A. ;" Soil samples will be collected from each 13 borings at initial depths of 2.5 feet bgs. Soil samples will then be collected at a maximum vertical spacing of approximately 5 feet. The samples will be screened in the field with a portable photoionization detector (PID) to tow determine organic vapor content. Selected soil samples will by sent to a state-certified- laboratory for analysis. Samples will be analyzed for benzene, toluene, ethlybenzene, aw xylenes (BTEX), total petroleum hydrocarbons (fPH) as gasoline and total lead. The samples will be analyzed, following the SJCPHSD's "Sampling Protocol for Routine Tank Removals," using GCFID/MS, EPA Method 8260, and Total Lead by Flame AA, EPA Method 7420. The estimated volume of soil cuttings removed from the borings is expected to be between one and two cubic yards. All drill cuttings will be stored temporarily at the site on top of and covered by plastic sheeting. Additional sampling and testing of the stockpiled soil may be required in order to meet local landfill disposal criteria. Following .r receipt of the laboratory results, the drill cuttings will be transported from the site by a state-licensed hauler to an appropriate disposal facility. .. t according to the health and safe rocedu s All work described herein will be completed a g safety p outlined in the site health and safety plan included in Appendix B. A copy of the health and safety plan will be available on site during all field operations. Upon completion of drilling, the bore holes will 'ted with a cement bentonite slurry. The slurry will not free fall more than twen (20) feet. The slurry will be pumped with a tremie pipe to depths greater than twenty fe l� ,pro � %, r -� 91-013A.RPT 6 •r it