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10 September 2004 AGE-NC Project No 03-1100 Page 6 of 10 • SVE4 was completed as a soil vapor extraction well, with the screen Interval installed from 25 feet to 30 feet bsg A filter pack was Installed from 23 feet to 30 feet bsg and a transition seal of two feet of bentonite chips was Installed above the filter pack and hydrated, • SVE5 was completed as a soil vapor extraction well,with the screen interval Installed from 30 feet to 35 feet bsg A filter pack was Installed from 28 feet to 35 feet bsg and a transition seal of two feet of bentonite chips was then Installed above the filter pack and hydrated The OZ soil borings were completed with manufactured-assembled 2-Inch by 30-Inch mlcroporous sparge points and blank casing extended to the surface, with a filter pack (No 3 Lonestar sand) In the following configurations • OZI was completed as an ozone sparge well,with a screen Interval Installed from 60 5 feet to 62 5 feet bsg A filter pack was Installed from 58 feet to 62 5 feet bsg and a transition seal of three feet of bentonite chips was then Installed above the filter pack and hydrated, • 0Z2 and 0Z3 were completed as ozone sparge wells, with a screen Interval installed from 60 feet to 62 feet bsg A filter pack was Installed from 57 feet to 62 feet bsg and a transition seal of three feet of bentonite chips was then Installed above the filter pack and hydrated All wells were then grouted to near the surface with portland cement A water-tight,traffic-rated well box was Installed over each well As-built well diagrams are Included with the boring logs in Appendix A 32 SOIL VAPOR EXTRACTION PROCEDURES As per the WES Addendum for Workplan for Soil Vapor Extraction Testing dated 12 September 2003 two soil vapor extraction pilot tests were conducted on 27 and 28 January 2004 On 27 January 2004, the upper layer, screened from 12 to 27 feet bsg, was tested using vapor well SVE1 as the extraction well On 28 January 2004, a second pilot test was conducted on the deeper Impacted areas closest to ground water at the site using vapor well SVE2, screened from 30 feet bsg to 35 feet bsg, as the extraction well The pilot tests were performed to evaluate SVE as a remedial - alternative The tests were conducted using a vapor extraction system (VES), VACLEEN IOOOG, manufactured by Environmental Techniques The VES unit consists of a positive displacement blower, driven by an Internal combustion (IC) engine Propane was used as a supplemental fuel source to start the engine and maintain performance Hydrocarbon vapor was destroyed as part of the Internal combustion process Emissions from the engine were routed through two catalytic converters to maximize the destruction rate of the extracted hydrocarbon vapors Advanced GeoEnvironmental,Inc