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VOCs, if present,to accumulate in the headspace above the sampled soil. The <br /> headspace will then be sampled using a flame ionization detector(FID) and a <br /> portable photo-ionization detector(PID). The PID and FID probes will be <br /> inserted through a hole made in the plastic bag and the highest measurement <br /> encountered recorded on the boring log. <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 /> • 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, <br /> 0.05-centimeter(0.020-inch), machine-slotted PVC well screen. If free product is <br /> encountered, product thickness will be verified using a disposable bailer. Up to <br /> three methods may be used for groundwater collection and these include the <br /> 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 /> • Polyethylene bailers will be discarded after each sample is collected. Stainless <br /> steel bailers will be washed between wells using a bristle brush with a detergent <br /> rinse followed by two clear water rinses, and a final deionized/distilled water rinse. <br /> The bailers will be air dried or dried using paper towels. <br /> • New nylon rope will be used to lower the bailers into the wells. The nylon rope <br /> will be discarded after each well. <br /> • Groundwater samples will be placed into laboratory-supplied containers containing <br /> preservatives. <br /> • Discharge to the containers should be conducted in a manner to minimize bubbling <br /> and agitation of the liquid. The containers will be filled to the top forming a <br /> meniscus to minimize the headspace. <br /> SAC/DP-N.9rancjpllProfectsl8318347601wkpin&hsplwp&hsp HSAM 110 HSA wp.doc A-2 <br /> 4119102 <br />