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t11 September 2001 AGE-NC Project No. 98-0466 ' Page 16 of 24 ' per billion (ppb) would not be considered an environmental hazard and could qualify for land disposal, unless considered hazardous for other reasons. In addition to the TEF, the percentage of the TEQ attributed to 2,3,7,8-TCDD should be considered when assessing the risk associated with ' contamination. Results of the dioxin analyses show that the TEQ threshold was not exceeded in any of the six ' samples analyzed. The TEQs for composite sample 1 (SP4-6, SP7-6, SP 12-4, SP14-6), composite sample 2(SP1 9-6, SP 17-4,SP 16-2)and composite sample 3(SPI 0-4,DP 10-5)were 242.315 parts per trillion(ppt),43.695 ppt and 47.064 ppt,respectively.The TEQs for individual samples SP 12-5, ' SP14-7, SP7-7 and SP4-7 were 9.149 ppt, 7.624 ppt, 433.59 ppt, and 295.94 ppt, respectively. Samples SP12-5 and SP14-7 did not contain 2,3,7,8-TCDD at concentrations above laboratory reporting limits. Percentages of the TEQ contributed by 2,3,7,8-TCDD in the remaining samples ' ranged from 2.52%to 28.5%. Analytical results of dioxin analysis was summarized in AGE's Site Environmental History, dated 04 May 2001. ' In addition to dioxin analyses, selected samples collected in June 2000 were analyzed for lead and pH. Results of the analyses show that the total lead content is above background levels but are not ' high enough to classify the soil as hazardous waste for total lead. Four samples were analyzed for soluble lead due to higher elevated total lead concentrations(SP3-2A, SP4-6A, SP7-6A and SP14- 1A) and were found to contain soluble lead concentrations ranging frdm 0.02 mg/1 to 0.18 mg/l. ' These concentrations do not exceed the STLC of 5 mg/1. Values of pH are at levels considered to be background, ranging from 8.15 to 9.15. Analytical results of individual stockpile samples are summarized in Table 5. ' During the December 2000 site investigation, a ground water sample collected from boring SBP-1 did not contain detectable concentrations of TRPH,formaldehyde,TCE; TCP,PCP or VOCs.Total ' chromium was detected in the ground water sample at a concentration of 0.30 mg/l, lead was detected at 0.03 mg/l,copper,nickel and zinc were detected at concentrations of 0.24 mg/l,0.27 mg/1 and 0.36 mg/l.The sample was not filtered prior to analysis,so the metals results include total metals ' from entrained mineral grains and are not representative of dissolved metals concentrations.Table 6 includes a summary of analytical results of soil and ground water samples. ' AGE proposes to collect up to 20 additional soil samples from the soil stockpiles to assess for copper and lead for waste classification and potential treatment requirements. ' 4.0. FIELD INVESTIGATION ' To further assess the areas of potential concern,AGE proposes to advan e 12 soil borings to ground water(approximately 45 to 50 feet bsg)in the various areas of concern. Ground water samples and ' selected soil samples will be collected and analyzed for chemicals of concern specific to each Advanced GeoEnvironmental, Inc.