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

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


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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


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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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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


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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


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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

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

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