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a <br /> { 9 <br /> '^w <br /> Organic Vapor Procedures <br /> Soil samples collected at 5-foot depth intervals during drilling will be analyzed in the field <br /> for ionizable organic compounds using a flame-ionization detector (FID) or a photo- <br /> ionization detector(PID) with a 10.2 eV lamp. The test procedure will involve measuring <br /> approximately 30 grams from an undisturbed soil sample, placing this subsample in a <br /> ZiplockTM-type bag or in a clean glass jar, and sealing the jar with aluminum foil secured <br /> under a ring-type threaded lid. The container will. be warmed for approximately <br /> ? 20 minutes (in the sun), then the head-space within the container will be tested for total <br /> organic vapor, measured in parts per million as benzene (ppm; volume/volume). The <br /> instrument will be calibrated prior to drilling. The results of the field testing will be noted <br /> on the boring logs. FID/PID readings are useful for indicating relative levels of <br /> contamination, but cannot be used to evaluate hydrocarbon levels with the confidence of <br /> laboratory analyses. <br /> i <br /> Laboratory Procedures <br /> Selected soil samples .will be analyzed for the presence of total petroleum hydrocarbons <br /> calculated as gasoline (TPH-g), benzene, toluene, ethylbenzene, xylenes (BTEX) and <br /> methyl tertiary-butyl ether (MtBE) using EPA Methods 8015 Modified and 8020, with <br /> MtBE confirmation of the highest detected MtBE concentration from each boring using <br /> EPA Method 8260. In addition the soil sample corresponding with the highest benzene <br /> concentration will be analyzed for 1,2-dichloroethane (1,2-DCA), ethylene dibromide <br /> (EDB) and total lead. Groundwater samples will be analyzed for the presence of TPH-g, <br /> BTEX, and for five oxygenates using EPA Methods 8015 Modified, 8020 and 8260, <br /> respectively. <br /> Soil Cuttings and Purge Water <br /> r Soil cuttings generated during drilling operations will be temporarily stored on site and <br /> covered with plastic sheeting pending characterization and disposal. A California-certified <br /> disposal contractor will remove soil cuttings to an appropriate disposal facility. Water <br /> generated during steam cleaning, development, and sampling of wells will be temporarily <br /> Y <br /> stored in DOT-approved 55-gallon drums pending transport by the disposal contractor to <br /> s an appropriate disposal or treatment facility. <br /> F <br /> 9111-011.113/0102/Workplan B - 2 j <br />