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Woodward-Clyde <br /> 2.0 <br /> FIELD INVESTIGATION <br /> V <br /> The following sections•describe the field activities conducted for the KJAX site. WCFS <br /> conducted site characterization activities at the KJAX Radio Transmitter Station site in <br /> Stockton, California. All field activities were conducted under the inspection and approval <br /> of the SJCEHD. <br /> 2.1 SITE CHARACTERIZATION ACTIVITIES <br /> A total of seven soil borings (B-1 through B-7) were advanced at the KJAX Radion <br /> Transmitter Station site to assess the vertical and lateral extent of petroleum hydrocarbons <br /> in soil in the area of the former UST (Figure 4). One soil boring (B-3) was advanced <br /> through the former UST backfilled excavation to a depth of 50 feet bgs. Five soil borings <br /> were advanced to a depth of approximately 30 feet near the former UST. One soil boring <br /> (B-7) located downgradient (east) from the former UST was advanced to a depth of <br /> approximately 100 feet bgs. Groundwater was encountered in boring B-7 at a depth of <br /> approximately 76.5 feet bgs. <br /> The site characterization activities were conducted in three phases due to site conditions and <br /> SJCEHD recommendations. Phase I included the advancement of five soil borings utilizing <br /> Direct Push Technology (DPT) methods to collect soil samples. Phase II included the <br /> advancement of two soil borings using DPT methods to collect soil and groundwater <br /> samples. Phase III included the overdrilling of soil boring B-3 (designated as B-3A) and <br /> additional soil sampling utilizing conventional hollow stem auger drilling methods. <br /> Phase I and II soil borings were advanced using Geoprobe DPT methodology to collect soil <br /> and groundwater samples. The Geoprobe rig was provided by EN PROB of Oroville, <br /> California. The Geoprobe DPT is a hydraulically powered soil probing equipment for soil <br /> vapor, soil core, and groundwater sampling applications. Mechanized, vehicle mounted soil <br /> probe systems apply static force and hydraulically powered percussion hammers for tool <br /> placement. Advantages of probing equipment include ease of mobilization, absence of <br /> borehole cuttings (no disposal costs for cuttings), minimization of surface disturbance, and <br /> V <br /> 8054/FEMAWAXPIER.RPT/8-24-95 SAC 2-1 <br /> V <br />