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r <br /> hm. <br /> OF <br /> o Drilling of four soil borir..gs for the purpose of obtaining soil samples to be analyzed <br /> in the field via gas chromatography,and further testing by Bio National Corporation. <br /> o Conversion of tour soil borings to ground waxer observation wells for the purpose of <br /> obtaining water samples for analysis at Fireman's Fund Laboratories of Fetaluma, <br /> J,4 California. <br /> E Soil borings will be drilled tv enab=e installation of observation wells. Truck mounted hollow- <br /> stem auger drilling equipment will beused. <br /> j Each boring will be advanced to approximately ter,feet below the water table or into a clay <br /> or other material below the water table,suspected to be of lower permeabVity,whichever is less <br /> deep. Undisturbed soil samples will be obtained using lite Dames & Moore Type-U !ampler <br /> ? r driven by a 140 pound hammer falling 30 inches. Samples will be collected from the borings at <br /> minimum intervals of five feet. The clean sampler wil.be driven into the soil beneath the open <br /> borehole. The soil samples retained in the 3-inch stainless steel tube:,will be removed from the <br /> b�I <br /> sampler and their ends sealed with teflon membranes and plastic end caps. Eacn sainpiz-Cjected <br /> for chemical an-�:ysis will be securely sealed,labeled and stored in ice cooled wwtain�s. <br /> . y <br /> To prohibit cross-contamination of successive samples, the sampling equipment will be <br /> disassembled between sampling attempts and washed with a tri-sodium phosphate (TSP)soap <br /> solution. The samplers will.hen be reassembled with clean 3-ir:cf stainless steel tubes and then <br /> ' used for subsequent sampling. All augers and sampling equipment will be thoroughly steam- <br /> clsaned between borings to prevent cross-con:amination. <br /> Four ground water wells will be installed at the facility. The wells will be installed for water <br /> level monitoring and ground water sampling pLrposes. <br /> Four ground water samples, one quality control duplicate field blank, a t.tvzl blank and a <br /> r.iasat3 sample will be collected for chemical analysis for each round of ground water sampling. <br /> Samples will be analyzed for total petroleum hydrocarbons(TPH)and benzene.toluene,xylene, <br /> and ethylbenzene by EPA Method 8015 Modified and Method 602. <br /> V. HAZARD ANALYSIS <br /> Based!ie the site background and planned actiAties,the following types of hazards exist <br /> Pinch points and rotating machinery associated with truck mounted drill rigs; <br /> Skin contact with potentially contaminated soil and wNtei-u:firing sampling; <br /> Inhalation of organic vapors during soil and water sampling; and <br /> ' Inhalation and ingestion of soil particle: potentially contaminated with benzene, <br /> toluene, xylene, and ethylbenzene. <br /> Sampling in this area could result in the release of contaminated particles and organic vapors. <br /> A minimum level of persos.nel prorection must be recommended that will prevent skin contact <br /> with the soil and prevent re3pirato-y inhalation of soil particles or vapors. Specifics regavding <br /> necessary protective measures are addressed in the next section. Also, the attached Material <br /> Safety Data Sheets (MSDSs) list impor.ant properties of various contaminants that may possibly <br /> be encountered. <br /> 2 <br />