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kn KLEINFELDER <br /> pushed into the soil/aquifer at the bottom of the borings. Additional lengths of pipe can be <br /> �,. screwed onto the probe to extend it-as needed. A weighted glass, vacuum sealed sampling <br /> ampoule is placed through the pipe down to the tip. Between the tip and the sample vessel <br /> LM is a double sided syringe which punctures the seal on the tip and the sample vessel. In this <br /> way, ground water is drawn through the tip into the glass vessel. The sample vessel is <br /> pulled out of the pipe and the syringe removed. Removal of the syringe does not break the <br /> seal on the glass ampoule. The sterilized glass sample vessels are purchased from the BAT <br /> company. <br /> The first sample extracted from the probe is considered a purge sample and is not <br /> �. submitted for chemical analysis. The sampling process can be repeated as necessary to <br /> obtain sufficient sample volume without diminished accuracy. <br /> Ground water samples will be labeled, logged onto a chain-of-custody, and stored in an <br /> iced cooler. At the end of drilling operations, ground water samples will be delivered <br /> under chain-of-custody documentation at Enseco Inc. in West Sacramento, an EPA-State <br /> certified analytical laboratory. <br /> After purging and sam�V ,t e galvanized pipe and tip are extracted from the boring and <br /> the boring is grouted with a cement/bentonite slurry. The tips, galvanized pipe or other <br /> equipment that may have been used in the boring are steam cleaned or washed with <br /> trisodium phosphate and a distilled water rinse prior to insertion into the next boring. <br /> 3.3 QUALITATIVE FIELD SCREENING <br /> An organic vapor analyzer will be used to screen the soil samples collected from the <br /> �- borings. Field screening of soil samples should provide a qualitative indication of the <br /> presence of petroleum hydrocarbons. An organic vapor analyzer measures hydrocarbons in <br /> air in parts per million by volume (ppmv). Based on field screening results soil samples <br /> may be recommended for chemical analysis. <br /> 3.4 HEALTH AND SAFETY <br /> " Kleinfelder personnel and their field subcontractors have completed the 40-hour course <br /> and annual 8-hour update required by 29 CFR 1910.120. Kleinfelder's courses are taught <br /> L <br /> �. F6-90-164 4 <br />