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XIFCI*l%k INC <br /> Letter to Ms. Letitia Resch <br /> February 7, 1989 <br /> Page 2 <br /> Each soil core and drive sample will be examined with an Organic <br /> Vapor Analyzer (OVA) meter using headspace analytical procedures in <br /> order to determine, in the field, if potential contamination exists. <br /> Representative samples of the soil will be placed in a glass jar. The <br /> jar will be sealed and the sample shaken. After 10 minutes a small hole <br /> will be made in the seal and the headspace above the sample will be P1� <br /> analyzed for organic compounds with the OVA meter. <br /> Samples from any contaminated zones identified with the OVA meter <br /> will be submitted for laboratory analysis. At least five soil samples <br /> will be collected from each borehole during drilling. The samples will Q <br /> be collected in brass tubes and will be fitted with an air-tight lid. <br /> The tubes will be packed as full as possible with the soil to minimize <br /> the headspace. A minimum of 15 soil samples will be collected, at <br /> least three of which will be submitted for analysis for Total Petroleum <br /> Hydrocarbons (TPH) as diesel fuel by EPA Method 8015M, TPH as gasoline �7 <br /> by EPA Method 5030 (purge and trap, LOFT Manual ) , and for benzene, <br /> toluene, ethylbenzene, and xylene (BTEX) by EPA Method 8020. The <br /> laboratory analyses will be performed by Trace Analysis Laboratory, a <br /> State-certified laboratory. <br /> All sample containers will be decontaminated in a laboratory. The <br /> decontamination procedures for field sampling are given below. <br /> 1. Sampling equipment is nondedicated. As such, it must be �f <br /> carefully cleaned prior to each use, as follows: <br /> a. Carefully brush off any loose foreign debris with a soft <br /> bristle brush. <br /> b. Rinse the equipment thoroughly in clean water. <br /> c. Wash the equipment in a nonphosphate detergent bath. <br /> d. Rinse thoroughly in clean water. <br /> e. Rinse thoroughly with deionized water. <br /> f. Rinse with acetone. <br /> g. Rinse with pesticide-grade hexane. <br /> h. Air dry in a dust-free environment. <br /> 2. Clean, disposable gloves will be worn by all field personnel <br /> when handling decontaminated equipment. �� � <br />