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01 March 2004 AGE-NC Project No 99-0645 Page 3 of 11 2 13 Drilling Equipment Decontamination and Borehole Abandonment All hollow stem augers were cleaned prior to advancement in each boring location The sampling equipment was washed in Alconox solution and rinsed with water prior to each sampling run to avoid cross-contamination At the conclusion of soil boring activities, borings B6' and B7 were permanently sealed to prevent vertical migration of contaminants, while the reaming borings were completed as wells and a sanitary seal was Installed to prevent vertical migration of contaminants Under EHD oversight, the borehole was backfilled with cement slurry from total depth to surface grade 2 2 WELL AND BORING COMPLETIONS The soil borings were completed using two-inch diameter PVC casing with 0 020-inch slotted screen materials and blank casing extended to the surface, with a filter pack (No 3 Lonestar sand) in the following configurations • MW-1R was completed as a ground water monitoring well,with the screen interval installed from 80 feet to 100 feet bsg A filter pack was installed from 78 feet to 100 feet bsg and a transition seal of two feet of bentonite chip plug was then installed above the filter pack and hydrated • VW 1 B was completed as a slant soil vapor extraction well,with the screen interval installed from approximately 15 feet to 40 feet bsg A filter pack was installed from 14 feet to 40 feet bsg and a transition seal of one foot of bentonite chip plug was then installed above the filter pack and hydrated • VW 1 A was completed as soil vapor extraction well, with the screen interval installed from 40 feet to 70 feet bsg A filter pack was installed from 38 feet to 70 feet bsg and a transition seal of two feet of bentomte chip plug was then installed above the filter pack and hydrated • VW2 was completed as soil vapor extraction well,with the screen interval installed from 15 feet to 40 feet bsg A filter pack was installed from 13 feet to 40 feet bsg and a transition seal of one foot of bentonite chip plug was then installed above the filter pack and hydrated • VW3 was completed as soil vapor extraction well, with the screen interval installed from 20 feet to 50 feet bsg A filter pack was installed from 18 feet to 60 feet bsg and a transition seal of two feet of bentonite chip plug was then installed above the filter pack and hydrated The wells were then grouted to near the surface with portland cement A water-tight, traffic-rated well box was installed over each well An as-built well diagram is included with the boring logs In Appendix B i Advanced GeoEnvironmental,Inc