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ARCADIS Ms. Amaru <br /> February 19, 2010 <br /> Prior to use and between borings, all non-disposable field equipment used for <br /> sampling will be decontaminated using deionized water,Alconox cleaning solution <br /> and a nitric acid solution. Soil samples will be logged for lithologic properties <br /> (including soil type, color, moisture content, etc.)using the Unified Soil Classification <br /> System. In addition, observations will be noted regarding odor, staining, and relative <br /> volatile organic compound(VOC)concentrations, as measured with a <br /> photoionization detector(PID). All soil samples will be logged by experienced field <br /> personnel, under the supervision of a California Professional Geologist. <br /> All samples will be sealed, labeled, and placed in an ice-chilled cooler for delivery to <br /> a California Department of Public Health-certified analytical laboratory. Soil samples <br /> will be selectively analyzed for the following: <br /> • TPH gasoline range by United States Environmental Protection Agency <br /> (USEPA)Method 8015B(M) <br /> • BTEX by USEPA Method 8021 B <br /> • TPH diesel range by USEPA Method 8015B(M) <br /> • TPH motor oil range by USEPA Method 8015B(M) <br /> • Moisture content by American Society for Testing and Materials(ASTM) <br /> Method D-2216(so that results can be presented on a dry weight basis) <br /> Grab groundwater samples will be analyzed for the following: <br /> • TPH gasoline range by USEPA Method 8015B(M) <br /> • BTEX by USEPA Method 8021 B <br /> • TPH diesel range by USEPA Method 8015B(M) <br /> • TPH motor oil range by USEPA Method 8015B(M) <br /> All primary samples will be analyzed upon receipt at the laboratory. All contingency <br /> samples will be held at the laboratory as required to preserve sample integrity <br /> pending the results of the primary samples, and will be tested if necessary. <br /> Soil cuttings generated during the hand augering activities will be used to backfill <br /> borings that do not encounter groundwater. Excess soil cuttings will be consolidated <br /> with previously excavated soil in a roll-off bin at the site pending characterization and <br /> disposal. If additional backfill material is needed, bentonite grout will be used. Where <br /> Page: <br /> 4/7 <br />