1. Chequamegon National Forest Clover and Cabin Lake Sites – Site Investigation Update and Path Forward

2. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites2 Purpose of Meeting n Provide a summary of the 2006 and 2007 geophysical work and planned site investigation work for 2007 n Seek input and concurrence on next steps of investigation n Discuss schedule

3. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites3 Geophysical Findings n The extent of metallic debris has been effectively delineated for the purposes of planning site investigation activities at both the Cabin Lake and Clover sites

4. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites4 Cabin Lake Geophysical Findings

5. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites5 Cabin Lake Geophysical Findings

6. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites6 Clover Geophysical Findings

7. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites7 Clover Geophysical Findings

8. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites8 Clover Geophysical Findings

9. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites9 Clover Geophysical Findings

10. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites10 Proposed Site Investigation n General field sampling effort: – Phase I - Geophysical Survey (complete) – Phase II – Soil, Sediment, and Surface Water Sampling n Proposed sampling will be focused on collecting samples at biased locations, based on geophysical results, per Administrative Settlement Agreement and Order on Consent (ASAOC)

11. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites11 Proposed Sampling - Cabin Lake n Sample distribution: – Two soil borings to 20 feet below ground surface n Deep borings proposed in/near the current open area n Samples to be collected at 0-2, 2-4, 6-8, and 18-20 feet below ground surface (bgs) and based on visual results, if necessary – Seven proposed borings to eight feet at positively biased locations n Borings distributed where elevated metallic debris identified n Samples proposed at 0-2, 2-4, and 6-8 feet bgs and based on visual results, if necessary – One proposed surface water sample from Cabin Lake – Two proposed sediment samples in the southern half of Cabin Lake – Two proposed trenches to six feet bgs at anomalous metallic detections north and east of clearing n Trenching proposed to identify nature of debris present n A single soil sample is proposed from a representative location beneath the excavated debris layer in each trench

12. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites12 Proposed Sampling – Cabin Lake

13. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites13 Proposed Sampling - Clover n Sample distribution: – Three soil borings to 20 feet below ground surface n Deep borings proposed in southern and northern blast pits n Samples proposed at 0-2, 2-4, 6-8, and 18-20 feet bgs and based on visual results, if necessary – Eight soil borings to eight feet bgs at positively biased locations n All eight borings proposed in the north valley n Samples proposed at 0-2, 2-4, and 6-8 feet bgs and based on visual results, if necessary – Nine proposed surface soil samples (0–2 feet bgs) at positively biased locations n Two located in surface water infiltration locations n Three distributed in debris field north of former south blast pit n Three distributed on ridge south of former southern blast pit n One at truck parking area – Four proposed trenches to six feet. Two in southern blast pit and two at operators station n Trenching proposed to identify nature of debris present n A single soil sample is proposed from a representative location beneath the excavated debris layer in each trench

14. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites14 Proposed Sampling – Clover

15. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites15 Proposed Sampling – Clover

16. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites16 Proposed Laboratory Analyses n All samples collected at each site will be analyzed for Nitroaromatic and nitramine organic compounds and Appendix IX metals n Select samples at both sites will be analyzed for VOCs, SVOCs, and trace elements n One surface soil sample from each geographic area where elevated metallic concentrations identified by geophysical survey n All samples at operators station and truck parking area will be analyzed for VOCs and SVOCs

17. June 18, 2007Chequamegon National Forest - Cabin Lake and Clover Sites17 Proposed Schedule n Work Plan and associated documentation submitted by end of June n Field work will begin within 45 days of approval of work plan, waste management plan