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Three soil borings (B30 through B32) will be advanced adjacent to the former location of a 10,000 -gallon diesel UST and 5,000 -gallon gasoline UST removed from the area southeast of the OMS. The borings will be advanced to a maximum depth of 45 feet. A maximum of eight soil samples and three grab -groundwater samples (one from each boring) will be collected from the borings. The soil and groundwater samples will be analyzed for TPH-g, TPH-d, TPH j, BTEX and five fuel oxygenates. Two soil borings (B33 and B34) will be advanced adjacent to the vehicle inspection rack located south of the OMS building. The borings will be advanced to a maximum depth of 45 feet. A maximum of eight soil samples and two grab -groundwater samples (one from each boring) will be collected from the borings. The soil and groundwater samples will be analyzed for TPH-g, TPH-d, TPH j, BTEX and five fuel oxygenates. 3.3.2 Soil Sampling To evaluate soil conditions, soil borings will be cored using a direct -push sampler. Soil samples will be selected from cored material collected at five to ten -foot intervals for field or laboratory analysis, beginning at five feet bgs. Field analysis will be conducted using a Photovac Model 580B photo -ionization detector (PID) or equivalent. A sample will be selected for laboratory analysis based on field observations and analysis. The total depth of each soil boring will be 45 feet, or approximately two to five feet below the depth of first encountered groundwater. If field monitoring and observations indicate significant contamination, borings may be extended beyond the proposed total depth. Soil samples will be collected in dedicated butyrate liners. The Versar Site supervisor will ensure that the sampler is thoroughly cleaned prior to collecting each sample. A Versar geologist will be on Site to log each boring as it progresses. The soils encountered will be characterized according to the Unified Soil Classification System (ASTM D-2487), and will include notations of pertinent characteristics. A geologist registered in the State of California will review the drill logs produced. Down -hole equipment, including rods, probes, and sampling equipment, will be thoroughly cleaned and decontaminated before and after drilling each boring. Pending disposal, decontamination water generated during the field investigation will be stored in 55 -gallon drums. Each drum will be labeled with the date of waste accumulation, the waste source, and a contact phone number. Soil samples will be screened for volatile organic constituents of concern in the field using the standard field headspace analysis. Samples for headspace analysis will be placed in a resealable plastic bag and allowed to warm in the sun or other suitable location. A headspace reading of the warmed soil will be performed by inserting the intake of the PID into the bag and agitating the 3027-03/104700.4766.230/IUL23'03