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11 December 2000 <br /> AGE-NC Project No 97-0333 <br /> Page 4 of 5 <br /> ' • The ground water elevation at the site was within the screened intervals of wells MW-1, <br /> MW-2, MW-3, MW-4 and MW-5 which yield samples fully representative of shallow <br /> ground water conditions <br /> • Ground water elevations increased at the site an average 1 30 feet between the July 2000 and <br /> October 2000 ground water monitoring events, the increase of ground water elevations is <br /> probably due to the seasonal fluctuation pattern <br /> • The core of the dissolved petroleum hydrocarbon plume appears to be located in the area of <br /> MW-2 (screened between 12 and 32 feet bsg), analysis of ground water samples collected <br /> ' from MW-2 suggest the core of the plume is impacted by TPH-g, BTEX, and MTBE <br /> • Substantial concentrations of dissolved TAME have previously been detected in water <br /> samples collected from well MW-1 and a grab ground water sample collected from P-3 <br /> indicating that there is a limited area impacted with TAME in ground water in the area <br /> assessed <br /> ' The vertical extent of dissolved petroleum hydrocarbons is not fully defined at the site, the <br /> lateral extent of the dissolved petroleum hydrocarbon plume is not fully defined toward the <br /> ' northwest, north, east and southeast of the current area bound by wells MW_I, MW-2, MW- <br /> 3, MW-4 and MW-5 <br /> ' 5 0 RFC'OMMFNDATIONS <br /> ' Based upon the results of the Fourth Quartcr2000 inn,cstigatlon, AGL recommends <br /> • Continued quarterly ground «ater monitoring utilizing wells M"'-1 , MW-2, MW-3, MW-4 <br /> ' and MW-5 for characterization of ground water conditions on the site, the next quarterly <br /> ground water monitoring event is tentatively scheduled for January 2001 <br /> Additional vtrtical soil and ground watLf assessment is warranted at the site AGI has <br /> tentatively scheduled to dell five cone penetrometer testing (CPT) soil bonngs to <br /> charactcnic the. X,crtica] L\tent of hydrocarbon-impacted ground k�atcr at the site <br /> ' ]nstollat:on of additional shallov, and deep-screened giound water monitoring wells bascd <br /> on the findings of the proposed CPT soil bonngs, the screen interkals for the deep-screened <br /> monitonng wdis v ill be placed to deflnf., and monitorthe vertical extent Of the ground v atci <br /> ptumc. <br /> Initlat1On of I_L111CC11alI01J feasibility studies fo, corrcc.ti\L action <br /> !ntera„� r���i�d1 a�i�7n �flii<<s Ei3 [hL 11La of un MUilo'l grouiicl ��atcr U] 1131 cont1n1litatloil t(I <br /> ' lrh uut rl f,k01 riti it nntm til u <br />