Laserfiche WebLink
KLEINFELDER <br /> �. 3 FIELD ACTIVITIES <br /> 3.1 DRILLING <br /> `-' A total of three soil borings will be drilled on the property. Proposed locations of the <br /> borings are shown on Plate 2. Boring locations are based on the assumed direction of <br /> ground water flow, and the proximity of facilities discussed in the above. Soil borings will <br /> be advanced with a truck-mounted drill rig equipped with 6-inch hollow-stem augers. <br /> Depth to water is estimated to be 10 to 15 feet below ground surface. Borings will not be <br /> drilled past the soil ground water interface. During drilling and sampling activities, an <br /> experienced environmental geologist will classify the soil, collect samples, and log the <br /> ` boreholes. <br /> Soil samples will be collected by advancing the boring to a point immediately_ above the <br /> sampling depth and then driving a Modified California Sampler lined with three brass <br /> ,., tubes into the undisturbed soil. The sampler will then be removed from the bottom of the <br /> boring, and a select tube will be sealed with Teflon sheeting, and tight fitting plastic end <br /> caps. The sealed tube will be labeled, logged onto a chain-of-custody, and stored in an iced <br /> cooler. The samples will be retained in refrigerated storage for future reference or <br /> analysis. <br /> 4 <br /> To reduce the potential for cross-contamination between borings, augers and associated <br /> equipment will be steam cleaned prior to the drilling of each borehole. The sampling <br /> equipment will be cleaned with a trisodium phosphate wash and a distilled water rinse <br /> �.. prior to the collection of each sample. Drill cuttings will be placed in Department of <br /> Transportation approved 55-gallon drums, labeled and left onsite for future disposition. <br /> Upon completion of the drilling activities, each boring will be backfilled with a <br /> cement/bentonite grout. <br /> 3.2 GROUND WATER SAMPLING <br /> Ground water samples will be extracted from the bottom of the borings using a BAT <br /> Probe. The BAT Probe consists of a sample extraction tip made of stainless steel. The tip <br /> �- is lowered into the boring at the end of a 1-inch inside diameter galvanized steel pipe, and <br /> �„ F6-90-164 3 <br />