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10 November 1999 AGB-NC Project No. 98-0433 ' Page 8 of 13 TPH-g was detected laterally in soil samples at 25 feet bsg in soil borings B.1, B3, 135 and B6 at concentrations up to 20 nig/kg at the north end of the former UST and at concentrations of 1.2 mg/kg and 1.4 mg/kg else\ hct-c. •IPH-g,was not detected in soil samples collected at 30 feet.bsg- • TPH-d was detected in soil above 20 1'eet bsg at concentrations up to 6;700 mg/kg (B6-10').• I'PIJ-d was detected in soil at 20 feet bsg at concentrations up to 8.200 cora/kg(134-20'). TPH- d was detected in soil samples at 20 feet bsg, nortli from the former UST to boring-138 (1.6 mgr/kg). TPH-d N-irks in soil at the same level to the west of the former UST in soil boring 135 (5,100 mg/kg), south in soil boring 13211 (170 rnglkg) and in soil boring 1322 (1.1 i.ng/kg) at 20 feet bsg. • TPH-d was cetected in the four soil samples analyzed from 25 feet bsg neat- the former LJS`l. area at concentrations up to 39 nig/kg {83-25'). TPH-d was not detected in soil samples collected at 30 feet bsl.i. ' BT3_X compounds were detected in nine of the 24 soil samples analyzed. 'ne g,-eatest concentrations of 13,T X compounds:dctccted "vere generally in soil isan,ples collected near the former US"1' ai:ea at 20 feet bsg; 13TEX. compounds were not detected in the former ctispenser areas' Benzene was detected in five of.'24 soil samples analyzed. ' • M'TBE was detected in seven of the 2.4 soil samples analysed. MTBE concentrations detected in soil frons the former UST area at 10 feet bsg were 9.9 mg/kg (1.31-10). MTBE, wits detected in the soil sample collected at 20 feet bsg at concentratinns up.to 1.4 ing/kg. • MTBE was also detected 11-1 soil-samples collected near the former UST area at 25 feet bsg ' at concentrations up to 0.34 nig/k�o(EPA.Method 8020). 11te concentrations of'l11`IBF In soil - at 25 feet bsg decreased laterally to the norfli and northwest, with no detection of M'113L in ' soil samples collected from boring 136; the highest concentration was encountered at the nortliwest cornea- of the former UST area. ' 41 TBA was detected in four soil samples analyzed, Soil hear the former USTarea ata depth of' 10 feet bsg contained the 7reatest concentration of TBA at 15,000 u,,,/kg. The concentration of:IBA decreased with &plh (20') in soil'boring B 1 to a concentration of 1.20 �q,A/ and to concenti,ation o128 u,,/kg.at 20 feet bsg i[7 soil boring 1-31. • TBA%\,as detected in soil at a depth of 25 feet bsg at the northwest corner of the lorIner UST ' area. Yet TBA w•as not det<cted in sail collected from boring 82 at 30 feet bsg; in soil boring 135 at 25 feet bsg or in soil boring 116 at 25 feet bso. 1_,aboratory results o€.soil saialples analyzed for petroleum hydrocarbons are surntnarired ill 'Table; l . the laboratory reports (\,1AI Laboratory ID 12447 to 12472), clu;ality assurance and duality control (QA/QC) reports and chains-of-custody are included in Appendix D. • - ;frlrar+errrl CcoEn�irorr nrcnt,:l, SqC,