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22 May 2000 <br /> AGE-NC Project No. 00-0704 <br /> Page 5 of 7 <br /> 4.2. FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL <br /> Organic vapor was detected in soil sample duplicates collected from B5-5', B5-10' and B8-10' at <br /> concentrations of 0.2 parts per million(ppm), 72 ppm, and 8 ppm, respectively. <br /> 4.3. GROUND WATER DEPTH AND GRADIENT <br /> Based on field data collected on-site ground water depth is approximately 45 feet bsg. <br /> 4.4. RESULTS OF SOIL SAMPLE ANALYSIS <br /> Select soil samples from probe borings and hand-auger borings were submitted for analysis for <br /> TPH-g, TPH-d, TPH-mo, BTEX, fuel oxygenates, and VOCs. The locations of investigation <br /> included four former Graylift, Inc. areas consisting of; a storm drain basin, a former paint spray <br /> booth, a former steam-cleaning area, and a former UST and dispenser island area. A fifth area <br /> formerly utilized for a Shell gasoline and service station, located at the southeast corner of the <br /> property, was also sampled. <br /> Storm Drainage Basin <br /> Three hand-auger soil samples were collected from the east, middle and west end of the drainage <br /> pond area and were identified as HA1-3', HA2-3', and HA3-3', respectively. The samples were <br /> composite analyzed 3:1 and petroleum hydrocarbons TPH-d and TPH-mo were detected at a <br /> concentration of 82 ppm, 520 ppm, respectively. Hand-auger sample HA4-2'and soil probe boring <br /> B12-6" collected from the south wall of the drainage pond and the area due east of the pond, <br /> formerly a above ground used oil storage tank area, were composite analyzed 2:1. Cadmium, <br /> chromium, nickel, lead, and zinc were detected at concentrations as high as 1.4 ppm, 46 ppm, 30 <br /> ppm, 200 ppm, and 510 ppm, respectively. <br /> Former Spray Paint Booth <br /> Soil sample B10-5' was collected from the area formerly utilized as a spray paint booth and <br /> tetrachloroethene (TCE) was detected at a concentration of 0.0063 ppm. <br /> Former Steam-Cleaning Area <br /> Soil boring B9 was advanced near the former steam cleaning area. Soil samples B9-10' and B9-15' <br /> were composite analyzed 2:1, TPH-g was detected at a concentration of 1.7 ppm. Additionally, <br /> samples B9-5' and B9-10'were composite analyzed 2:1 and chromium,nickel, lead, and zinc were <br /> detected at concentrations as high as 26 ppm, 31 ppm, 6.5 ppm, and 53 ppm, respectively. <br /> Advanced GeoEnvironmental,Inc. <br />