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' 12 December 2006 AGE-NC Project No 01-0827 ' Page 3 of 14 ' and the former UST excavation Boring B15 was established inside the truck bay of the building, north of the former UST excavation Additionally,boring B16 was completed as vapor well VW-4 and boring B17 was completed as duel-screened vapor well VW-5 During January 1994 a second ' SVE remediation feasibility pilot study was conducted on the site,on well VW-1 and VW5 During October 1994, a third SVE remediation feasibility pilot study was conducted on well VW-1 Based on the pilot tests,the 1994 Final Remediation Plan included justification for the use of ground water ' extraction and soil vapor extraction for site remediation In November 1998, based on a new November 1998 directive the EHD, a fourth SVE remediation I feasibility pilot study and an in-situ air-sparging(IAS)pilot study were conducted on the site,at well VW-5d However, the sparge test indicated a defective grout seal in well VW-2, the upper screen of the well VW-2 was later abandoned with grout The SVE pilot test was conducted at vapor well IVW-I for 15 hours In April 1999,an full scale IAS pilot study was conducted on the site The IAS pilot test was unable ' to produce air-flow into the subsurface at monitoring well MW-I and therefore was terminated Also in April 1999, a fifth SVE remediation feasibility pilot study was conducted on vapor well VW-1 for 2 hours ' • In June 1999, an additional full scale in-situ gP Y air-s ar in pilot stud was conducted on the site P g Iwithout a positive result and therefore the test was terminated at 80 minutes In January 2000,a feasibility study including justification for the use of in-situ air sparging and soil ' vapor extraction for site remediation was submitted to the EHD Additionally, a second Final Remediation Plan dated 02 April 2000 was submitted to the EHD Both of the proposals for site remediation were approved by the EHD IThe vertical assessment of the dissolved hydrocarbons at the former UST was accomplished with the installation of monitoring well MW-6 03 March 2003 Well MW-6 is a discrete, deep-screened Ifrom 60 to 65 feet bsg 23 SITE REMEDIATION PROGRESS The site is presently being remediated by procedures outlined in Design Plans and Specifications For I Soil and Groundwater Remediation, prepared by ATC Associates Inc (ATC) and approved by the EHD by letter dated 03 January 2001 On 24 and 25 July 2001,three air-sparge well pilot borings and three soil vapor extraction well pilot • borings were advanced at the site,wells IAS-1 to IAS-3 were completed at a depth of 40 feet bsg and IAdvanced GeaEnvirnnmental,Inc