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Human and Ecological Risk Assessment - Earthjustice

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Appendix CAttachment C-2: Hydrogeologic EnvironmentHydrogeologic SettingHydrogeologic Environment (continued)Hydrogeologic EnvironmentPlant Code Description Code DescriptionLel<strong>and</strong> Olds 7Eb River Alluvium Without 7 River Valleys <strong>and</strong> FloodplainsOverbank Depositswithout Overbank DepositsLel<strong>and</strong> Olds 7G Thin Till Over BeddedSedimentary RockLon Wright 7Ea River Alluvium WithOverbank DepositsLon Wright 7Eb River Alluvium WithoutOverbank DepositsLouisa 7Ea River Alluvium WithOverbank DepositsLouisa 7Eb River Alluvium WithoutOverbank DepositsMarion 7Aa Glacial Till Over BeddedSedimentary RockPercentageComment50 Percentage based on surficial geology;assumed coarse soils3 Till Over Sedimentary Rock 50 Percentage based on surficial geology;assumed coarse soils6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit7 River Valleys <strong>and</strong> Floodplainswithout Overbank Deposits6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit7 River Valleys <strong>and</strong> Floodplainswithout Overbank Deposits30 Alluvial based on predominant Heath,productive aquifer; percentage based on soiltextures70 Alluvial based on predominant Heath,productive aquifer; percentage based on soiltextures50 Alluvial Valley; significant coarse-graineddeposits50 Alluvial Valley; significant coarse-graineddeposits3 Till Over Sedimentary Rock 100 Assigned to Glaciated Central region basedon surficial geology (pre-Wisconsin drift)Marshall 8D Regolith 1 Metamorphic <strong>and</strong> Igneous 100 Based on surficial geologyMartin Lake 10Ab Unconsolidated <strong>and</strong> Semi-Consolidated ShallowSurficial Aquifer10 Unconsolidated <strong>and</strong>Semiconsolidated ShallowAquifers100 Setting based on aquifer <strong>and</strong> surficialgeology coveragesMayo 8D Regolith 1 Metamorphic <strong>and</strong> Igneous 100 Based on surficial geologyMeramec 7Ea River Alluvium WithOverbank Deposits6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit100 Based on surficial, predominant HeathMerom 7D Buried Valley 4 S<strong>and</strong> <strong>and</strong> Gravel 100 Glaciofluvial aquifer overlaid by alluvialdepositsMiami Fort 7Ea River Alluvium WithOverbank Deposits6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit100 Assigned based on productive aquifers,surficial geology <strong>and</strong> soil (3% SNL)(continued)April 2010–Draft EPA document.C-2-13

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