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r <br /> SOIL BORINGS, NOVEMBER 28, 1994 <br /> Selection of Soil Boring Locations <br /> The original work plan for the site called for the drilling of five <br /> soil borings. During the drilling, it was decided that it would be <br /> beneficial to drill two additional borings. <br /> The first of the seven soil borings (SBI) was drilled at an angle <br /> of 20 degrees next to the forklift shop in order to sample closer <br /> to the shop. <br /> Borings SB2 , SB5 and SB7 were drilled inside the arc of the <br /> present "clean" monitor wells in order to develop a better picture <br /> of the hydrocarbon plume. <br /> SB3 was drilled an the property belonging to Ms. Pam Lopez , to the <br /> north of the former TVG tank excavation. The soil from this boring <br /> field tested as clean. Therefore, this established the northern <br /> edge of the soil plume. <br /> While the rig was present on the Lopez property, a boring (SBA) was <br /> drilled at the site of a former underground gasoline storage tank <br /> for the property owner. The PID readings and product odor present <br /> in this boring indicated that the former tank area was <br />. contaminated. In order to establish if this problem was localized <br /> to the former tank excavation or was part of the TVG plume, SB4 was <br /> drilled on the northern property between the former tank pit and <br /> the TVG tank excavation. The concentrations observed in SB4 were <br /> (PID, 30 ppm; TPHg water, 0. 7mg/L; and TPHg for SB4-15, c1. 0) much <br /> lower than the Lopez boring (PID, 1500 ppm; TPHg water, 26 . 0 mg/L; <br /> and TPHg SBA-15, 30 mg/kg) . This indicates that each property has <br /> a separate distinct hydrocarbon plume. <br /> Since SB2 had moderately high PID readings, SB6 was drilled to <br /> define the extent of the hydrocarbon plume (see Table 1) . <br /> The locations of the borings are shown in Figure 3 . <br /> Drilling and Soil Sample Collection <br /> The seven soil borings were drilled by a licensed drilling <br /> contractor using a mobile rig equipped with eight inch diameter <br /> hollow stem augers. The borings were drilled to 20 feet. <br /> Representative soil samples were collected at five foot intervals, <br /> an 211 X 6" brass sleeves, with the aid of a 140 lb. slide hammer <br /> and split spoon sampler. A new disposable bailer was used to <br /> collect a water sample from the inside of the augers. <br /> The augers and sampling equipment were steam cleaned prior to the <br /> drilling of each soil boring and the sampling equipment washed with <br />• a TSP solution between each sampling interval. <br /> 2 <br />