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10 August 1998 AGE-NC Project No. 98-0471 Page 5 of 8 Black peat material was noted to have a high petroleum hydrocarbon content at depths of three to seven feet bsg. Gray green silty sand was observed at depths of seven to eight feet bsg. Soils observed in the other trenches were a mixture of clay and peat. Typically peat soils extended to depths of six to seven feet bsg. In the area of trench T4, black silty clay was observed from depths of six inches to four feet bsg. At a depth of four feet bsg to a depth of five feet bsg waste material including; bottles, cans, metal, wood,tires, clothes and other assorted farm wastes were evenly distributed within the clay backfill material These materials and containers were filled with fluids. 4.2. ANALYTICAL RESULTS OF TRENCHING AND STOCK PILE SAMPLES TPH-g was detected in trench samples T1-E, T1-W and T1-N at concentrations of 19,000 parts per million(ppm,reported as milligrams per kilogram), 4,900 ppm and 15 ppm, respectively. Benzene was also detected in the wall samples at concentrations as great as 690 ppm. Sample Tl-Floor had no detectable hydrocarbons or BTE&X. Significant concentrations of TPH-d and motor oil-range compounds were detected in the wall samples from trench T1.TPH-d was detected in trench samples T1-E, T1-W and T1-N at concentrations of 10,000 ppm, 5,900 ppm and 3,600 ppm, respectively. TPH-mo was detected in the same samples at concentrations of 7,800 ppm, 81 ppm and 330 ppm, respectively. MTBE was quantified above the method detection limits in sample TI-N at a concentration of 0.65 ppm. TPH-d and motor oil range compounds were detected at low concentrations in the floor samples from trench T2 and T3. TPH-d/TPH-mo were detected in trench samples T2 and T3 at concentrations of 5.9/41 ppm, and 88/390 ppm, respectively. TPH-g was also detected in the same soil samples at concentrations of 1.1 ppm and 67 ppm, respectively. MTBE was quantified above the method detection limits in sample T2 at a concentration of 0.089 ppm. Other BTE&X compounds were detected at low concentrations in samples T1-1, T2-1 and T4-1. BTE&X compounds were not detected in sample T3-2. TPH-d was detected at low concentrations in trench samples from the excavation established next to the large AST. Sample T4-1 had TPH-d detected at a concentrations of 2.4 ppm.The same sample had detectable TPH-mo at a concentration of 6.0 ppm. Toluene and xylene were detected in the same sample at concentrations of 0.011 ppm and 0.008 ppm, respectively.No other samples from trench T4 had detectable concentrations of petroleum-hydrocarbons. Petroleum hydrocarbons were detected in two of the three samples collected from the trenches Advanced GeoEnviron mental,Inc.