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' 24 June 2005 <br /> AGE-NC Project No 95-0103 <br /> Page 9 of 12 <br /> ' Ferrous iron and total soluble iron were not detected in the sample <br /> • The remaining metals and ions detected in the water samples do not significantly vary in <br /> concentrations between the wells However, some elements were reduced in the core area of <br /> ' the plume and generally TOC was elevated within the core areas (EW-3=9 6 mg/l and <br /> MW-2=1 6 mg/1) Additionally, COD was only detected on the site in the core of the <br /> petroleum release area <br /> The expressed assimilative capacity (EAC) for the ground water at the site was estimated t6 be <br /> 9 044 mg/1 (difference in concentrations between background and areas of highest BTEX <br /> 5 contamination-Appendix D) The typical EAC for successful loss of contamination in the aquifer has <br /> been depicted above 300 mg/l, however, because of the simplifications of the estimate, only <br /> empirical field data(analytical data)can be relied upon to reflect contaminant degradation and mass <br /> reduction As with all estimates of mass loss, EAC does not represent actual subsurface reactions <br /> ' The hydrocarbon analytical results of current and previous monitoring well samples are summarized <br /> in Tables 2, 3 and Table 4 for the ground water extraction wells A comparison of the low-flow <br /> sampling and the full-purge sampling depicts close agreement In TPH concentrations,however the <br /> ' low-flow purge sampling may not extract sufficient ground water to mobilize adsorbed BTEX <br /> compounds into the ground water, and thus may not be representative of the dissolved BTEX <br /> concentrations when compared to the multi-purge sampling techniques Conversely samples <br /> collected with low-flow purge methods demonstrated significant benzene only concentrations in the <br /> core of the plume <br /> ' The laboratory report of the current ground water sampling data (CTEL 0505100 and 0505111), <br /> quality assurance and quality control (QA/QC) data and chain-of-custody form are included in <br /> Appendix C <br /> 3 3 GEOTRACKER CONFIRMATIONS <br /> GeoTracker confirmation pages of the submitted laboratory electronic deliverable format(EDF)files <br /> 1 are included in Appendix E <br /> 1 4.0. SUMMARY/CONCLUSIONS <br /> Based on the results of ground water remediation and monitoring activities, AGE concludes the <br /> following <br /> 1 Advanced GeoEnveronenental,Inc <br />