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28 January 2005 <br /> AGE-NC Project No 02-0964 <br /> Page 2 of 7 <br /> Occupational Safety and Health Administration, U S Coast Guard and U S Environmental <br /> Protection Agency, 1985) Prior to mobilization,the proposed well locations will be clearly marked <br /> and a utility clearance obtained through Underground Service Alert <br /> 22 DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to advance three pilot soil borings at the site for installation of ground water <br /> monitoring wells,using a truck-mounted,hollow-stern drill ng equipped with 8 25-inch hollow-stem <br /> augers Two soil pilot borings to approximately 40 feet below surface grade (bsg), the total depth <br /> of each well boring may vary according to hydrogeologic/geologic conditions encountered during <br /> drilling One soil pilot boring to approximately 100 feet bsg based on the site stratigraphy generated <br /> from Cone Penetration Testing data, the total depth of each well boring may vary according to <br /> hydrogeologic/geologic conditions encountered during drilling <br /> One of the shallow borings will be advanced south of the location of boring B to monitor the shallow <br /> dissolved contamination, one at the location of boring H to monitor the shallow contamination and <br /> further to define the eastern, down-gradient edge of the plume and one deeper boring at the location <br /> of boring CPT2 and boring J to monitor the area of the highest petroleum hydrocarbon <br /> concentrations detected (Figure 3) Unocal monitoring wells U-16,U-17, U-18 and U-19 currently <br /> define the dissolved hydrocarbon plume east of the site and Unocal monitoring well U-7 somewhat <br /> defines the dissolved hydrocarbon plume north of the site, however the distance to some of these <br /> wells from the Sutter Office Center potential release area is considerable Additionally, the lateral <br /> and vertical extent of dissolved hydrocarbons has been defined west and south of the Sutter Office <br /> Center potential release area, by current on-site monitoring wells and soil boring samples <br /> Soil samples will be collected from within the 8 25-inch hollow-stem augers at five-foot intervals <br /> using a California split-spoon sampler and brass sleeves Selected soil samples will be analyzed by <br /> a State of California DHS-certified laboratory for the following constituents <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethyl benzene and total xylene (BTEX) <br /> in accordance with EPA Method 8260 and <br /> • Oxygenated compounds di-isopropyl ether(DIPS),ethyl tertiary-butyl ether(ETBE),methyl <br /> tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> methanol, ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in <br /> accordance with EPA Method 8260 <br />• <br /> Advanced GeoEnvironmental,Inc <br />