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} <br /> 12 January 2007 <br /> AGE-NC Project No. 96-0232 <br /> Page 4 of 7 <br /> natural attenuation)to determine appropriate remedial options for the site. <br /> AGE: 30 June 1999: AGE submitted InvestigationlRemedial Feasibility Study Work Plan for the <br /> installation of four soil probe borings and the performance of a ground water extraction pilot <br /> study. <br /> AGE: 15 September 2000:AGE recommended in the quarterly report that based upon the analytical <br /> data from previous and current monitoring events,AGE believes that the TPH-d and TPH-g <br /> plumes are either stable or declining. In addition, only trace concentrations of BTE&X and <br /> MTBE have been detected in the ground water samples in the past. Therefore, AGE <br /> recommends that one additional ground water monitoring well be installed in the down- <br /> gradient direction near the southeast corner of the property.Following the installation of the <br /> additional ground water monitoring well,AGE recommends an additional year of quarterly <br /> monitoring. If the hydrocarbon plumes show no lateral migration in the down-gradient <br /> direction and the concentrations of hydrocarbons remain stable or decline,AGE will request <br /> the PHS-EHD consider granting closure for this site. <br /> AGE: 13 June 2001:AGE recommended in the quarterly report that additional vertical assessment <br /> of the dissolved hydrocarbons is required. <br /> EHD: 10 September 2001: EHD approved the AGE-prepared Additional Site Investigation Work <br /> Plan Addendum to complete 4 additional soil borings to define the vertical extent of <br /> contamination in soil and ground water. <br /> AGE: 02 January 2002: AGE recommended in the quarterly report to prepare the CAP to mitigate <br /> the dissolved TPH-d in the former UST area. <br /> AGE: 10 March 2003: AGE recommended in the quarterly report to continue bi-monthly vacuum <br /> extraction of ground water and free product from well MW-4. <br /> EHD: 24 June 2002:EHD gpproved the AGE-prepared Additional Site Assessment and Feasibility <br /> Study Work Plan to install one monitoring well to define the extent of groundwater <br /> contamination down gradient of MW#2; complete three dual ozone sparge wells in the <br /> source near MW#4 and down gradient near MW#2; and to p—e-Rona 6-month ozone sparge <br /> feasibility study. <br /> AGE: On 28 and 29 October 2002: AGE installed one monitoring well and three ozone sparge <br /> wells at the site as proposed in Additional Site Assessment and Feasibility Study Work Plan, <br /> dated 07 June 2002 and approved by the EHD by letter dated 24 June 2002;AGE will initiate <br /> Advanced GeoEnvironmental,Inc. <br />