Laserfiche WebLink
�+ k'q KLEINFELDER <br /> APPENDIX A <br /> KLEINFELDER FIELD PROCEDURES <br /> DRILLING <br /> Soil borings are advanced using a truck-mounted drill rig, equipped with 8-inch or 10-inch <br /> diameter hollow stem augers. During drilling, an experienced environmental geologist <br /> ,�. classifies soils, collects soil samples for laboratory analysis and logs the boreholes. <br /> All augers and associated equipment are steam cleaned prior to the drilling of each boring. <br /> In addition, all sampling equipment is cleaned with a alcanox wash and rinsed with distilled <br /> water prior to the collection of each soil sample. <br /> Soil samples are collected every five feet for field screening, lithologic logging, and <br /> potential chemical analysis. Soil samples are collected by advancing the boring to a point <br /> immediately above the desired sampling depth and then driving a Modified California <br /> w.. Sampler, lined with three brass tubes into the undisturbed soil. The sampler is then <br /> removed from the bottom of the boring and when the potential analysis is for volatile or <br /> ti. semi-volatile constituents, the bottom (third) tube is sealed with aluminum foil and tight- <br /> fitting plastic caps. The sealed tube is immediately stored in an iced cooler for possible <br /> chemical analysis. Soil samples for chemical analysis are delivered to a laboratory, <br /> certified by the Department of Health Services for the required analyses, under chain-of- <br /> 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 /> ionizable compounds in the air in parts per million by volume (ppmv). 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 /> LW <br /> �, 121-88-1108 <br />