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Three soil borings (B30 through B32) will be advanced adjacent to the former location of a <br /> 10,000-gallon diesel UST and 5,000-gallon gasoline UST removed from the area southeast of the <br /> OMS. The borings will be advanced to a maximum depth of 45 feet. A maximum of eight soil <br /> samples and three grab-groundwater samples (one from each boring) will be collected from the <br /> borings. The soil and groundwater samples will be analyzed for TPH-g, TPH-d, TPH j, BTEX <br /> and five fuel oxygenates. <br /> Two soil borings (B33 and B34) will be advanced adjacent to the vehicle inspection rack located <br /> south of the OMS building. The borings will be advanced to a maximum depth of 45 feet. A <br /> maximum of eight soil samples and two grab-groundwater samples (one from each boring) will <br /> be collected from the borings. The soil and groundwater samples will be analyzed for TPH-g, <br /> TPH-d, TPH j, BTEX and five fuel oxygenates. <br /> 3.3.2 Soil Sampling <br /> To evaluate soil conditions, soil borings will be cored using a direct-push sampler. Soil samples <br /> will be selected from cored material collected at five to ten-foot intervals for field or laboratory <br /> analysis, beginning at five feet bgs. Field analysis will be conducted using a Photovac Model <br /> 580B photo-ionization detector(PID) or equivalent. A sample will be selected for laboratory <br /> analysis based on field observations and analysis. <br /> The total depth of each soil boring will be 45 feet, or approximately two to five feet below the <br /> depth of first encountered groundwater. If field monitoring and observations indicate significant <br /> contamination, borings may be extended beyond the proposed total depth. Soil samples will be <br /> collected in dedicated butyrate liners. The Versar Site supervisor will ensure that the sampler is <br /> thoroughly cleaned prior to collecting each sample. <br /> A Versar geologist will be on Site to log each boring as it progresses. The soils encountered will <br /> be characterized according to the Unified Soil Classification System (ASTM D-2487), and will <br /> include notations of pertinent characteristics. A geologist registered in the State of California <br /> will review the drill logs produced. <br /> Down-hole equipment, including rods,probes, and sampling equipment, will be thoroughly <br /> cleaned and decontaminated before and after drilling each boring. Pending disposal, <br /> decontamination water generated during the field investigation will be stored in 55-gallon drums. <br /> Each drum will be labeled with the date of waste accumulation, the waste source, and a contact <br /> phone number. <br /> Soil samples will be screened for volatile organic constituents of concern in the field using the <br /> standard field headspace analysis. Samples for headspace analysis will be placed in a resealable <br /> plastic bag and allowed to warm in the sun or other suitable location. A headspace reading of the <br /> warmed soil will be performed by inserting the intake of the PID into the bag and agitating the <br /> 8 <br /> 3027-03/104700.4766.230/IUL23'03 <br />