Purpose of Meeting
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Transcript of Purpose of Meeting
Chequamegon National ForestClover and Cabin Lake Sites – Site Investigation Update and Path Forward
June 18, 2007 Chequamegon National Forest - Cabin Lake and Clover Sites
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Purpose of Meeting
Provide a summary of the 2006 and 2007 geophysical work and planned site investigation work for 2007
Seek input and concurrence on next steps of investigation
Discuss schedule
June 18, 2007 Chequamegon National Forest - Cabin Lake and Clover Sites
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Geophysical Findings
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
June 18, 2007 Chequamegon National Forest - Cabin Lake and Clover Sites
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Cabin Lake Geophysical Findings
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Cabin Lake Geophysical Findings
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Clover Geophysical Findings
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Clover Geophysical Findings
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Clover Geophysical Findings
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Clover Geophysical Findings
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Proposed Site Investigation
General field sampling effort:– Phase I - Geophysical Survey (complete)– Phase II – Soil, Sediment, and Surface Water
Sampling Proposed sampling will be focused on
collecting samples at biased locations, based on geophysical results, per Administrative Settlement Agreement and Order on Consent (ASAOC)
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Proposed Sampling - Cabin Lake
Sample distribution:– Two soil borings to 20 feet below ground surface
Deep borings proposed in/near the current open area 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
Borings distributed where elevated metallic debris identified 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 Trenching proposed to identify nature of debris present A single soil sample is proposed from a representative location
beneath the excavated debris layer in each trench
June 18, 2007 Chequamegon National Forest - Cabin Lake and Clover Sites
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Proposed Sampling – Cabin Lake
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Proposed Sampling - Clover
Sample distribution:– Three soil borings to 20 feet below ground surface
Deep borings proposed in southern and northern blast pits 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
All eight borings proposed in the north valley 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 Two located in surface water infiltration locations Three distributed in debris field north of former south blast pit Three distributed on ridge south of former southern blast pit One at truck parking area
– Four proposed trenches to six feet . Two in southern blast pit and two at operator’s station
Trenching proposed to identify nature of debris present A single soil sample is proposed from a representative location beneath
the excavated debris layer in each trench
June 18, 2007 Chequamegon National Forest - Cabin Lake and Clover Sites
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Proposed Sampling – Clover
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Proposed Sampling – Clover
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Proposed Laboratory Analyses
All samples collected at each site will be analyzed for Nitroaromatic and nitramine organic compounds and Appendix IX metals
Select samples at both sites will be analyzed for VOCs, SVOCs, and trace elements
One surface soil sample from each geographic area where elevated metallic concentrations identified by geophysical survey
All samples at operator’s station and truck parking area will be analyzed for VOCs and SVOCs
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Proposed Schedule
Work Plan and associated documentation submitted by end of June
Field work will begin within 45 days of approval of work plan, waste management plan