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L' <br /> V <br /> 1.i <br /> ASSOCIATES I N C . <br /> L <br /> by PHS/EHD. The scope of work completed in phase one included obtaining permits, advancing <br /> two soil borings using direct push technology, soil and grab groundwater sampling, and the <br /> U laboratory analysis of selected soil and groundwater samples. <br /> L2_1 Drilling Activities <br /> On November 14, 1997, a geologist from ATC Associates supervised the advancement of two <br /> L <br /> soil borings to 30 feet below ground surface (bgs). A site plan showing soil boring locations is <br /> included as Figure 2. Fisch Environmental, California License C57 683865, advanced the borings <br /> using a truck mounted Geoprobe® narrow diameter rig employing direct push technology. Soil <br /> L samples were collected at five-foot intervals in acetate sampling tubes beginning at five feet below <br /> the ground surface and were described according to the Unified Soil Classification System. <br /> Descriptions of soil types encountered and sample collection intervals are presented on the boring <br /> logs contained in-Appendix A. <br /> L 2.2 Soil Sam lin <br /> p � <br /> L Each soil sample was field screened with a Photoionization Detector (PID) for the presence of <br /> i <br /> volatile organic compounds. Petroleum hydrocarbons were observed during field activities in <br /> borings SB 1 and SB2 beginning at depths of 24 feet and 19 feet bgs, respectively. The maximum <br /> L PID readings from each boring were from soil samples SB1-30 and SB2-20 at approximately 234 <br /> and 8,000 parts per million (ppm), respectively. Sample tubes were sealed at each end using <br /> L• Teflon tape and plastic end caps, labeled, and placed on ice. Selected soil samples were kept on <br /> ice and delivered under chain-of-custody documentation to a State-certified American <br /> r Environmental Network (AEN) laboratory (DOHS Cert. No. 1172) for chemical analysis. Field <br /> L notes are contained in Appendix B. <br /> 2_3 Groundwater Sampling <br /> One groundwater sample was collected from each boring at the depth groundwater was first <br /> L encountered, approximately 30 feet bgs. A Geoprobe® Screen Point 15 Groundwater Sampler <br /> was threaded onto the leading end of the Geoprobe after groundwater had been encountered. <br /> When the sampler was advanced, O-ring seals and an expendable drive point provided a <br /> watertight system to ensure sample integrity. <br /> LWhen the tool was advanced to the desired depth, extension rods were sent downhole to brace <br /> the bottom of the sample screen as the tool casing was retracted. When the casing was retracted, <br /> Lapproximately 41-inches of screen with slot sizes of 0.004 inches was exposed. Teflon tubing <br /> w:\14981\14981Veports\psi.doc 2 <br /> L <br />