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Appendix A <br /> Drilling and Sampling Procedures <br /> The procedures that will be used for drilling the borings and collecting soil samples are presented <br /> below. <br /> Drilling and Soil Sampling Procedures <br /> • Up to 6 soil borings will be advanced and sampled to first encountered <br /> groundwater(approximately 10 feet) using direct-push sampling equipment. <br /> • Discreet soil samples will be collected at 1.3-meter (4-foot) intervals until <br /> groundwater is encountered. Soil samples will be collected using a 5-centimeter <br /> (2-inch) diameter sampler lined with a 1.3 meter (4 foot) long acetate sleeve. <br /> • Borings will be backfilled with bentonite cement grout from the bottom of the <br /> borehole to ground surface. <br /> • The ground surface will be repaired with cold patch asphalt or concrete, where <br /> applicable. <br /> • The drilling and sampling equipment will be washed in a detergent rinse, two <br /> clear water rinses, and a final deionized/distilled water rinse prior to drilling. <br /> • Soil and wastewater generated during the field activities will be contained in <br /> 208-liter(55-gallon) United Nations approved drums. <br /> Groundwater Sampling Procedures <br /> • Field activities and equipment utilization will be recorded on field report forms. <br /> • Groundwater samples will be collected from either well casing inserted into each <br /> boring or HydroPunch-type groundwater sampling equipment. The well casing <br /> will consist of 2.5-centimeter(1-inch) diameter, Schedule 40, flush-threaded, 0.05- <br /> centimeter(0.020-inch), machine-slotted polyvinyl chloride (PVC) well screen. If <br /> free product is encountered, product thickness will be verified using a disposable <br /> bailer. Up to three methods may be used for groundwater collection and these <br /> include the following. <br /> — Dedicated Teflon tubing with a single-ball, stainless steel check valve; or <br /> — A new disposable polyethylene or Teflon bailer, or stainless steel bailer; or <br /> • — A peristaltic pump and new dedicated Teflon tubing. <br /> SAGDP-N.\rancfpl\Projects+ M34760�wkpin&hsp\SR 120 wp.doc A-1 <br /> 2RSA72 <br />