Laserfiche WebLink
21 December 2001 <br /> AGE-NC Project No.•95-0106 <br /> Page 4'of S <br /> • Analytical,data from monitoring wells MW-2.and MW-7 limits the horizontal extent-of <br /> dissolved hydrocarbons south and east of the site, respectively. Analytical data from wells - " <br /> MW-3 and MW-6 limits the extent of dissolved hydrocarbons northeastward of the site. .. . <br /> Analytical data from monitoring well MW-5 limits the,extent of dissolved hydrocarbons <br />' hydrocarbons to the west is.not well <br /> north-westward of the site. The extent of dissolved . <br /> defined at this time;it appears that the plume of contaminated ground water may have shifted <br /> to the east. <br /> Continued detection of TPH-g and BTEX in groundwater samples collected from the off-site <br /> well MW4 indicates that the plume of impacted ground water has migrated off-site towards <br /> the north, however, the general lack of detection of hydrocarbons in-the MW-7; MW-6, <br /> MW-5 and MW-3 wells shows that the plume is not wide-spread and has not migrated <br /> northeast of MW74 or northwest of the former UST pit. <br /> • The extent of the plume around MW-4 is constrained by data from MW-6 toward the north- <br /> northeast, MW-5 toward the southwest and MW-7 toward the east relative to MW-4. The <br /> northwestern extent of the plume from MW-4 is not well constrained. <br /> The results of this and previous monitoring events and previous soil investigations leads AGE to <br /> conclude that: <br /> • The hydrocarbons encountered in ground water samples.from MW-1 'and MW-4 represent <br /> a northward extension of the hydrocarbon-impacted ground water that had already reached <br /> its current'extent at the time.the monitoring well system was installed beginning in 1096. <br />' The variation of hydrocarbon concentrations in samples collected from MW-1 and MW-4 <br /> may be due to the closer proximity of MW-1 to impacted soil left in place near the former <br /> UST'site. <br />' 6.0: RECOMMENDATIONS <br />' AGE recommends continued quarterly montoring of.the 'monitoring,well network. The next ' <br /> monitoring event,should be scheduled for February 2002..In addition,.AGE will begin.-the proposed <br /> scope ofwork described in Revised WorkMan forSoil and.Gi�ound Water Investigation_ --Addendum,. <br /> dated 04 January 2000, prepared by AGE, during the first quarter;of 2002. <br /> Advanced t:"Enviru=ental,Inc. <br />