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logo h4 KLEINFELDER <br /> ,r APPENDIX A <br /> KLEINFELDER FIELD PROCEDURES <br /> Monitoring Well Installation and Sampling <br /> DRILLING <br /> 1.. <br /> Soil borings are advanced using a truck-mounted drill rig, equipped with 8-inch or 10-inch <br /> W hollow-stem augers. During drilling, an experienced environmental geologist classifies <br /> soils, collects soil samples for laboratory analysis and logs the boreholes. <br /> Lr <br /> To minimize cross-contamination, all augers and associated equipment are steam cleaned <br /> prior to the drilling of each boring. In addition, all sampling equipment is cleaned with a <br /> trisodium phosphate wash and rinsed with distilled water prior to the collection of each soil <br /> sample. <br /> Soil samples are collected every five feet for field screening, lithologic logging, and <br /> potential chemical analysis. To provide lithologic control, the bottom 20 feet of one of the <br /> soil borings will be continuously sampled. Soil samples are collected by advancing the <br /> L. boring to a point immediately above the desired sampling depth and then driving a <br /> Modified California Sampler, lined with three brass tubes into the undisturbed soil. The <br /> L. sampler is then removed from the bottom of the boring and when the potential analysis is <br /> for volatile or semi-volatile constituents, the bottom (third) tube is sealed with aluminum <br /> foil and tight-fitting plastic caps. The sealed tube is immediately stored in an iced cooler <br /> Li for possible chemical analysis. Soil samples for chemical analysis are delivered to a <br /> laboratory, certified by the Department of Health Services for the required analyses, under <br /> chain-of-custody procedures. <br /> QUALITATIVE FIELD SCREENING <br /> A Photovac TIP, using a photoionization detector (PID), is often used to provide a <br /> qualitative screening of each soil sample collected during the borings. The PID measures <br /> Lr <br /> ionizable compounds in the air in parts per million by volume (ppm). Field calibration is <br /> achieved by using a calibrated span gas. Ambient air is used as a zero. The screening <br /> procedure consists of sealing a soil sample in a clean Mason jar, allowing the sample to <br /> equilibrate for 5 to 15 minutes, and scanning the headspace of the jar for volatiles. The <br /> vapor reading is noted as the field screening result. <br /> �' 163-89-161 <br />