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oxygenates: tertiary butyl alcohol (TBA), MTBE, di -isopropyl ether (RIPE), ethyl tertiary butyl ether (ETBE), and tertiary amyl methyl ether (TAME) by EPA method 8260B. Combined Support Maintenance Shop (CSMS) Areas of concern at the CSMS are the vehicle wash rack in the north portion of the building, elevated metals and petroleum hydrocarbons in the drainage ditch along the north facility boundary, and two locations of pavement upwelling in the vehicle storage area east of the building. The field activities associated with the pavement upwelling are described in Section 3.5. One soil boring (B29) will be advanced adjacent to the vehicle wash rack located inside the north of the CSMS building. The boring will be advanced to a maximum depth of 45 feet. Four soil samples and one grab -groundwater sample will be collected from the boring. The soil and groundwater samples will be analyzed for TPH as hydraulic oil (TPH-ho) and polychlorinated biphenyls (PCBs). Discrete soil samples will be collected at ten locations along the north boundary drainage ditch. At each of the ten locations, samples will be collected at intervals of 0-0.5 feet, 1-1.5 feet and 3- 3.5 feet bas. The uppermost samples will be tested for total concentrations of 17 heavy metals (CAM 17 list) using EPA 6000 and 7000 series methods, as well as TPH-d, motor oil (TPHmo), and TPHj by EPA method 8015. If a 0-0.5 foot sample results indicate actionable impact, the underlying samples will be analyzed to assess the extent of impact. In the pavement upwelling areas, the cause for pavement upwelling is not understood. If, during excavation of the upwelling areas, cause for chemical contamination is encountered, soil samples will be collected (one for each upwelling location) for analyzed for the following contaminants: heavy metals (CAM 17 suite); semi -volatile organic compounds (SVOCs); TPH-g, d, j and mo; and BTEX. In addition, the CVRWQCB will be notified of a concern for chemical impact to the subsurface, if encountered. At the former boring location, B 10, near the waste storage area, soil samples will be collected just beneath the pavement section, and at 5 feet bgs. The uppermost sample will be tested for TPH-g, d, mo; BTEX; and SVOCs. The underlying sample will be held pending the results of the shallower sample. At the former sandblasting area, boring location B 11, one soil sample will be collected just beneath the pavement section and analyzed for 17 heavy metals (CAM 17). Operations and Maintenance Shop (OMS) Areas of concern at the OMS comprise the former vehicle fueling station in the parking lot between the OMS and CSMS, and the vehicle wash rack south of the OMS building. Elevated concentrations of petroleum hydrocarbons were detected at depths of 10 to 25 feet bgs in March 2002. 7 3027-03/104700.4766.230/JUL23' 03