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13 December 1999 <br /> AGE-NC Project No. 98-0433 <br /> 1 Page 8 of 13 <br /> to boring B8,west to soil boring B21 (MW-8),but was not detected in soil boring B22 (MW <br /> 7). <br /> • TPH-g was detected laterally in soil samples at 25 feet bsg in soil borings Bl, B3, B5 and B6 <br /> at concentrations up to 20 mg/kg at the north end of the former UST and at concentrations <br /> of 1.2 mg/kg and 1.4 mg/kg elsewhere. TPH-g was not detected in soil samples collected at <br /> 30 feet bsg. <br /> • TPH-g was detected in one soil sample from soil boring MW-1 at a depth of 25 feet bsg at <br /> a concentration of 420 mg/kg. BTEX was also detected in this soil sample. <br /> ' TPH-d.was detected in soil above 20 feet bsg at concentrations up to 6,700 mg/kg (B6-10'). <br /> TPH-d was detected in soil at 20 feet-bsg at concentrations up to 8,200 mg/kg(B4720'). TPH- <br /> d was detected in soil sarnples at 20 feet bsg, north from the former UST to boring B8'(1.6 <br /> ' mg/kg). TPH-d was in soil at the same level to the west of the former UST in soil boring B5 <br /> (5,100 mg/kg), southeast in soil boring B21 [MW-7] (1.70 mg/kg) and in soil boring B22 <br /> [MW-8] (1.1 mg/kg) at 20 feet bsg. <br /> 0 TPH-d was detected in the four soil samples analyzed from 25 feet bsg near the former UST' <br /> area at concentrations up to 38 mg/kg(B3-25').•TPH-d was not detected in probe boring soil <br /> samples collected at 30 feet'bsg. <br /> • TPH-d was detected in three of the soil samples collected from soil boring MW-1 at 15 feet, <br /> 25 feet and 30 feet bsg at concentrations of 1.5 mg/kg, 3,000 mg/kg and 4.9 mg/kg, <br /> respectively. <br /> • BTEX compounds.were detected in nine of the 24 soil samples analyzed. The greatest <br /> �. concentrations of BTEX compounds detected were generally in soil samples collected near <br /> the former UST area at 20 feet bsg; BTEX compounds were not detected in the former <br /> dispenser areas. Benzene was detected in five of 24 soil samples analyzed. <br /> • MTBE was detected in six of the 24 soil samples analyzed. MTBE concentrations detected <br /> in soil from the former UST area at 10 feet bsg were 9.9 mg/kg (B1-10'). MTBE was <br /> detected in the soil sample collected at 20 feet bsg at concentrations up to 1.4 mg/kg. <br /> • MTBE was also detected in soil samples collected near the former UST area at 25 feet bsg <br /> at concentrations up to 0.34 mg/kg(EPA Method 8020).The concentrations of MTBE in soil <br /> at 25 feet bsg decreased laterally to the north and northwest, with no detection of MTBE in <br /> soil samples collected from boring B6; the highest concentration at.25 feet" bsg was <br /> encountered at the northwest corner of the former UST area(B3). <br /> • MTBE was detected in two of the soil samples collected from the monitoring well pilot <br /> borings. Concentrations in samples MW1-15 and MWi-30 were 1.5-mg/kg and 0.32 mg/kg-, <br /> ' as quantified by EPA Method 8020. Concentrations in samples MW 1-15, MW 1-25 and <br /> Advanced GeoEnvironmental,Inc. <br />