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IBM, � <br /> .� <br /> o _ <br /> - 7 <br /> 3.0 FIELD METHODS <br /> 3.1 SOIL BORING/SAMPLING <br /> Prior to the commencement of drilling, all underground utilities will be <br /> located. All boreholes for soil sampling and subsequent well installation <br /> will be advanced using a mobile B-61 hollow stem auger drill rig. A <br /> California C-57 licensed driller will be subcontracted to perform the drilling <br /> services. The IT field geologist will conduct a tailgate safety meeting at <br /> the beginning of the day to insure that field activities are performed in <br /> accordance with the Health and Safety Plan (Appendix 0). <br /> Prior to drilling at each borehole, all augers will be thoroughly steam <br /> cleaned. The split spoon sampler and brass tube inserts will be cleaned prior <br /> to each sampling event with a non-phosphate detergent scrubbing, followed by a <br /> water rinse, methanol rinse and a final distilled water rinse. Bor— les wiTI . <br /> be logged and soil samples will be obtained by using a modified Cal'-toraia <br /> sampler under the direction of IT's field geologist. Soils will be described <br /> using the visual method of the Unified Soil Classification System (USCS). <br /> Sampling methods will include grab samples for soil description and <br /> examination as well as samples in decontaminated brass tubes for laboratory <br /> ' analysis. Samples will be obtained of vadose zone soils every five feet <br /> w beginning 5.0 feet below grade. <br /> Each core recovered, as well as periodic drill cuttings, will be screened for <br /> the release of volatile organic contaminants Frith an organic vapor analyzer <br /> equipped with a photoionization detector. The calibration of this instrument <br /> will be confirmed by the field geologist each day prior to use. Upon sample <br /> extraction, brass tube ends will be immediately sealed with aluminum foil and <br /> ~ fitted with end caps to prevent the loss of volatile compounds. Each v:be <br /> will be placed in a separate ziploc bag and sealed with security tape. <br /> Samples will be stored in a refrigerated ice chest and hand delivered to a <br /> OOHS certified laboratory analysis. <br /> � . An estimated three samples/borehole will be" suomitted for analysis. Soil <br /> _ samples selected for analysis will be either the deepest vadose zone soil or <br /> those exhibiting the highest vapor headspace concentrations. Chain-of-custody <br /> and requestor: analysis forms will accompany the samples at all times. <br /> 6 <br /> A:ENG:9205/031291 <br />