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Ms. Lori Duncan <br /> February 22, 2000 <br /> Page 3 of 5 <br /> cuttings were generated. All down-hole drilling and sampling equipment was decontaminated by <br /> washing with a laboratory grade detergent and rinsing with water. Rinseate collected from <br /> decontamination procedures was disposed of via evaporation on the asphalt/concrete surface within <br /> the confines of the investigation area. Soil and groundwater samples were submitted under chain <br /> of custody protocol to Argon Laboratories for analysis. <br /> RESULTS OF INVESTIGATION <br /> 4.1 Subsurface Conditions <br /> Subsurface soil at the site consisted primarily of fill and/or elastic silt from ground level to <br /> approximately 6-9 feet bgs, and silt and fine to medium grained sand from 6-9 feet bgs to <br /> approximately 26-28 feet bgs. Only borings SBI and S132 were advanced below 28 feet bgs. <br /> Soil encountered between the depths of 28 and 30 feet bgs consisted of well graded gravel with <br /> sand in SB 1 and lean clay and poorly graded sand in S132. Groundwater was not encountered in <br /> any boring. Groundwater reportedly exists at a depth of approximately 130 feet bgs. <br /> Moderate petroleum hydrocarbon odors were noted in the soil samples collected from S133 at 10, <br /> 15 and 25 feet bgs, and FID readings ranged from 400 parts per million (ppm) to 800 ppm in <br /> those samples. No sample was recovered from 20 feet bgs in boring SB3. Slight hydrocarbon <br /> odors were noted in boring S132 at 30 feet bgs (5 ppm FID). No hydrocarbon odors were noted <br /> in any samples collected from borings SBI, S134 or S135. However, the sample collected from <br /> boring S134 at 5 feet bgs contained a sewer-like, organic odor (100 ppm FID). Soil boring logs <br /> are included in Attachment A. Boring locations are shown on Figure 3. <br /> 4.2 Laboratory Analysis <br /> Soil samples collected from borings SBI through S134 were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and xylenes (BTEX), and <br /> gasoline oxygenate additives by EPA methods 8015 modified, 8020,and 8260, respectively. In <br /> addition, soil samples collected from S133 were analyzed for total oil and grease (TOG) using <br /> EPA method 5520B. The three soil samples collected from boring S135, which was located <br /> adjacent to the former waste oil tank, was analyzed for TOG. <br /> 4.3 Soil Analytical Results <br /> Low to moderate levels of petroleum hydrocarbon constituents were detected in the samples <br /> collected from boring S133. Most notably, TPHg was detected in samples collected from 10, 15, <br /> and 25 feet bgs at 3,000 ppm, 100 ppm, and 92 ppm, respectively. TOG was also detected in the <br /> samples collected from boring S133, ranging from 120 ppm (15 feet bgs) to 520 ppm (10 feet <br /> bgs). Benzene was detected in only one sample collected at the site, from boring S133 at 10 feet <br /> bgs (3.2 ppm). TPHg was detected at 1.8 ppm in the sample collected at 25 feet bgs in boring <br /> S132. No petroleum hydrocarbon constituents were detected in any other sample collected during <br /> this investigation. <br /> data\groundze\franks tire\subsurfsum.doc <br />