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OW16gieal Technics&C. SOOO I%,1 Page 2 Tank Closure Testing Report Project No. 1218.2 +r August 3,2005 GeoProbe boreholes (GP-1, GP-2 & GP-3) were advanced. The locations are shown on the Site Map (Figure 2). Each of the three GeoProbe borings was advanced to a total depth of 20 feet bgs. Two (2) soil samples from each boring were selected for laboratory analysis. Soil removed from the borings and not used for laboratory analysis was used to log the geology of the subsurface. Logs were produced for each of the boreholes and these logs are attached as Appendix C. Figure 3 shows our preliminary interpretation of the approximate extent of the contamination ,r and soil types. 2.1.1 Soil Sampling Procedure �. On July 12, 2005, V&W Drilling and Geological Technics personnel mobilized to the Broadway site. Eric L. Price, GTI geologist, collected soil samples and maintained a log from the soil borings. The boreholes were advanced using a GeoProbe 5400 direct push drill rig owned and operated by V&W Drilling, a licensed drilling contractor. The GeoProbe advances a coring �. tool with a pneumatic hammer to a selected depth. Upon reaching that depth the coring tool is opened and advanced further to fill the core barrel. The soil sample enters an acetate cylinder contained in the coring tool. Upon filling, the coring tool is pulled from the hole and L" the cylinder is removed. At a chosen interval, the cylinder is cut and the selected interval is capped with Teflon foil and plastic end caps and placed on ice for shipment to the laboratory. +r The sampling technician wore disposable gloves while collecting all samples. Two soil samples from each boring were submitted for laboratory analysis and a screening L. process was used to gather information through field observations. The field screening included: • Odor (measured via OVM, a portable photo ionization detector that uses a 10.6 eV lamp +- to detect compounds with ionization potential below 10.6 eV). • Sediment type,especially grain size and clay content • Moisture content • Visible evidence of contamination (i.e., color change due to reduction of iron or discoloration from hydrocarbons and other pollutants) DetaiIs on the geology encountered during the GeoProbe survey, as well as the field observations, are included in Section 3.2, Geology and Field Observations. w.. See Appendix C, Boring Logs for more information. Lo