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z► a <br /> • <br /> smTN <br /> feet below grade. Laboratory analyses of the samples detected toluene at 27 parts per billion <br /> (ppb) in both samples and total lead at 8 and 10 parts per million (ppm), respectively. Copies <br /> of laboratory reports and chain of custody documentation are included in Appendix A. <br /> Due to uncertainties regarding the analytical results, PHS/EHD indicated in the <br /> aforementioned correspondence that site closure certification could not be granted without <br /> further investigation. <br /> 3.0 METHODS OF INVESTIGATION <br /> In accordance with the approved workplan dated April 12, 1995, Smith Environmental <br /> personnel performed the following scope of work to complete a limited environmental <br /> assessment for the purpose of obtaining site closure certification. <br /> 3.1 Soil Sample Collection <br /> An experienced Smith Environmental geologist supervised the collection of four soil samples <br /> beneath the former underground fuel storage tank. The samples were collected by Kvilhaug <br /> Well Drilling and Pump Co. Inc. (C57# 482390) using the direct push technology. Discrete <br /> soil samples were collected beneath each end of the former tank location at depths of <br /> approximately 15 and 20 feet below grade. Samples were collected using the Geoprobe 5400 <br /> Soil Probe Unit, a sampling technique which enabled collection of undisturbed soil samples at <br /> the desired depth. Samples were be collected through the driven rod into 7/8-inch polymer <br /> tubes. The tubes were immediately sealed at each end using Teflon tape and plastic end caps, <br /> labeled, and placed in an iced cooler. The samples were subsequently transported under chain <br /> of custody documentation to Argon Laboratories in Ceres, California. Soil sample locations <br /> are shown on Figure 2. <br /> Subsequent to sample collection, the voids created by the Soil Probe Unit were grouted to the <br /> surface with a neat cement grout. No soil cuttings were generated during sampling activities <br /> because the sampling rods were advanced by displacing the soil rather than augering soil to the <br /> surface. <br /> N:\951121SR452395.doc 2 <br />