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10 November 1999 <br /> AGE-NC Project No. 98-0433 <br /> ' Page 10 of 13 , <br /> a rnicrofauna. for bioremediation. Nitrogen, potassium and phosphates was at sufficient levels to <br /> ' <br /> support a inicrofauna for bioremediation for undetermined time period. The water sample lead <br /> 131 I <br /> sigrnificant microbiological populations as biodegraders as compared to the general concentration <br /> of general microbial population. Hydrocarbon concentrations may be high enough to stimulate the <br /> selective biodegrader populations to accelerate natural attenuation. <br /> Under the present circumstances, natural atterivation of hydrocarbons in ground water by <br /> bioremediation is likely to occur on site wvith biogegraders present in. the ground water. Ho":ever, <br /> ' to demonstrate that continual bioremediation is occurring, additional bioenumci-ation analysis of <br /> ground \eater samples would need to be conducted. The Laboratory report (A. Keith Kaufniala <br /> [Junco]) and chain-of-custody form are included in Appendix F. <br /> 4.4. ' HYDROCARBON-IMPACTED GROUND WATER <br /> A total of live C7rab water samples were collected on the situ. Additioriall . after the instalitttiorr 6f <br /> the five ,round.water wells,on the site; all eight gi-ottncl water monitoring wells ,were sampled..l ach" <br /> • sample vas analyzed for TPH-o, TP1.1-d and BTEX with analysis for MTBE ind each sample.\vas <br /> analyzed for the suite of five fuel additives. <br /> ' Grab Hlalet-aSw2y)les <br /> • TPH-g Nvas detected in three of the grab ground water saniples collected from the site at <br /> ' concentrations ranging from 400 p-/1 to 23;000 ,ugll. TP1-1-d was detected in all live of the <br /> arab ground water saniples ai)alyzeci at concentrations ranging from 74 ,ugll to 580,000 �rgll. <br /> • Benzene wais detected in t�vo of the waicr samples analyzed at concentrations ranging fron-i <br /> ' 67 r,�. /l in boring 135 to 370 ug/1 in borirls 132. Toluene was detected iii each of the water <br /> samples analyzed at concentrations ranging froin 0.56 pg/l in boring 1314 to 57 ,t'�gll in boiiiig <br /> B2. Other BTEX compounds were also detected .at concentrations up to 850 /,.g/l. <br /> • M'1-f31' was detected in four of the waiter samples ,analyzed at concentrations ranging tioiil <br /> 2.1 ugll in boring 1318 to 2,900 i.qli in I)oring B2. "CBA was detected iii diree of the v,,atei- <br /> sainples analyzed at conccntraticnis rarngiiig from 12 uo/l in boring 1314 to 270 ug/I in boring <br /> 135. . . <br /> ' Analytical results of grab `zrouiid watcr samples analyzed are summarized in Table 2. "I'he laboracory . <br /> reports (MAI Laboratory 1.)12442 to12446i, quality assurance rind quality control (QA/QC) reports <br /> and chain-of-custody firms are included iii Appendix D. <br /> ' ;irlrauCrdGcul;itrit'unmrnL•rh I:rc. ' <br />