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07 June 2012 AGE-NC Project No. 95-0184 Page 2 of 14 �G .44 i The concentrations of dissolved constituents collected in southern UST area (MW-5) sc�r .L shallow well samples are greaterthan the intermediate and deeper monitoringwells MW-4_ , and W-8). The concentrations of dissolved constituents collected in northern UST area C�{S 70 J ,,+ intermediate well samples are lowerthan the shallow vaporwell samples(MW-1 vs. 5c� . The maximum concentrations of analytes in samples collected in the northern UST release s5�_�s' ;t? area appear to reside in the upper 50 feet of the subsurface as demonstrated by groun 4. area Z �rec Z5 -40 r` P4oy/ V W-2R_ z , r'u ✓e/ VW-4 —33 S1-53.S' 2.0. RECOUNT OF SCOPE OF WORK V ws tv- 24.51 -41.5' 1:.W-1 - 30'- S#' Multiple feasibility studies have been preformed to evaluate remedial action options forthe site. The following is a list of work plans prepared for remediation feasibility testing: • Work Plan Addendum dated 15 December 1995, a soil vapor extraction (SVE) pilot test was proposed. • Feasibility Pilot Tests Work Plan dated 16 December 1999, an in-situ air sparging (IAS) pilot test and a ground water extraction pilot test were proposed to be performed at the site. • Well Installation and Feasibility Study Work Plan - November 2004 dated 19 November 2004, installation of a ground water extraction well and a ground water extraction pilot test were proposed. • Work Plan Addendum dated 18 February 2005, a ground water extraction pilot test was proposed. • Work Plan Addendum dated 29 September 2005, a second ground waterextraction well was proposed. • Soil Vapor Extraction Pilot Test dated 10 November 2005, a SVE pilot test was proposed. \14114101."Sa:/ ✓A/oi £xfeaztio, Pi)e+Te5f 'Repe.1-141,GWEX+radW,,, P,jot Stv"i .�+_ 3/ 9Ja9 \µ1iµ oc • Quarterly Report - Fourth Quarter 2009 In-Situ Air Sparging repsility_Pilot Test Report dated 04 February 2010, a SVE pilot test was performed. Advanced GeoEnvironmental,Inc.