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Soil-bentonite groundwater cutoff wall construction
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9/27/2012
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Adding bentonite to cutoff wall excavation spoils. Once mixed to approximately 5% bentonite, the soil-bontonite slurry is placed back into the groundwater cutoff wall trench.
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10/9/2012
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Mixing soil and bentonite for groundwater cutoff wall slurry backfill
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8/26/2012
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Excavation of groundwater cutoff wall. Depth to bedrock is approximately 88 feet at this location. Water/bentonite slurry entering trench from pipe keeps trench clear. Smaller trackhoe is mixing excavated soil with bentonite.
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9/10/2012
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Mixing bentonite/water slurry pumped from slurry pond into the groundwater cutoff wall trench as it is excavated.
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9/10/2012
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Construction of stormwater sandfilter basin liner and quality control testing
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7/10/2012
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New stormwater sandfilter
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8/30/2012
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New stormwater detention basin
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8/30/2012
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New stormwater detention basin holding first week of rain after construction completion.
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10/16/2012
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Temporary cap located on the northern end of the site between the new East and West stormwater channels. Orange trackhoe marks the northern extent of the groundwater cutoff wall.
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10/16/2012
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Temporary cap at northern end of site. Trackhoe marks the northern end of the groundwater cutoff wall. East stormwater channel on left of photo. Confluence with West channel on the right. Stormwater detention basin on right edge of photo.
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10/16/2012
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