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_ 15 September 1995- - – - _ — AGE-NC Project No 95-0105 ' Page 5 of 7 ' The grab water sample collected from boring B 1 was found to contain TPH-g and TPH as motor oil at concentrations of 20,000 and 170 ppb, respectively BTE&X were also present in this sample at concentrations ranging from 110 ppb for toluene to 2,200 ppb for total xylenes ' TPH-g was detected in the water sample collected from boring 132 at a concentration of 730 ppb Toluene, ethylbenzene and xylenes were detected at concentrations up to 7 7 ppb The analytical ' results of soil boring samples and grab ground water samples are summarized in Table 3 The laboratory report and chain-of-custody form are presented to Appendix G 45 ANALYTICAL RESULTS OF TRENCHING, EXCAVATION AND STOCK PILE SAMPLES TPH-g was detected in trenching samples T1-1, T2-1, T3-2 and T4-1 at concentrations of 150, 780, 2 7 and 2,700 ppm, respectively Typically, concentrations of aromatic compounds are positively correlated with those of TPH-g However, sample T2-1 was found to contain benzene at 1 1 ppm while benzene was not detected in sample T4-1 No BTE&X were detected in sample T3-2 In excavation samples,the highest concentration of TPH-g at 1,600 ppm was detected in sample NW- 2,which also contains benzene at 12 ppm Samples NW-3, WW-1, WW-2 and SW-2 were found to contain TPH-g at concentrations of 14, 53, 330, and 23 ppm, respectively Petroleum hydrocarbons 1 were not detected in samples NW-1 or SW-1 The remaining excavation samples contain low to moderate concentrations of various aromatic hydrocarbons Analytical results of the stockpiled soil samples indicated the detection of TPH-g and volatile aromatics (toluene, ethyl benzene and xylenes) in every sample The most elevated concentrations ' were detected in sample SP-3, where TPH-g was present at 1,100 ppm, while volatile aromatic levels ranged from 0 005 ppm for toluene to 49 ppm for total xylenes Benzene, however, was not detected in any stock pile sample and the concentrations of TPH-g rn SP-1 and SP-2 were only 15 and 17 ppm, ' respectively Total lead was detected in the composited stockpiled soil sample at a concentration of 7 0 ppm The analytical results of these samples are summarized in Table 4 The laboratory report and chain-of-custody form are enclosed as Appendix H 1 ' 5.0. CONCLUSIONS AND RECOMMENDATIONS 5 1 HYDROCARBON-IlvIPACTED SOUL ' Based on the non-detection of hydrocarbons in samples NW-1 and in B2-5, the hydrocarbon plume did not extend beyond the location ofNW-1 and 132-5 in the northeasterly direction The southern t