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Human and Ecological Risk Assessment - Earthjustice

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Appendix CAttachment C-2: Hydrogeologic EnvironmentPlantAttachment C-2: Hydrogeologic EnvironmentHydrogeologic SettingHydrogeologic EnvironmentCode Description Code DescriptionBig Cajun 2 10Ba River Alluvium WithOverbank DepositsA B Brown 6Fa River Alluvium WithOverbank DepositsA/C Power-Ace Operations6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit2C Alluvial Fans 5 Alluvial Basins Valleys <strong>and</strong>FansAllen 10Ba River Alluvium WithOverbank DepositsAlma 7Ea River Alluvium WithOverbank DepositsAlma 7Eb River Alluvium WithoutOverbank DepositsAntelope Valley 7GThin Till Over BeddedSedimentary Rock6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit7 River Valleys <strong>and</strong> Floodplainswithout Overbank DepositsPercentageComment100 Predominant alluvial setting (100%alluvium); soils have significant fines(SCL+SLT = 95%)100 Predominant alluvial setting; soils havesignificant fines (SCL+SLT = 95%)100 Based on surficial geology; consistent withalluvial fan setting100 Setting based on aquifer coverages, surficialgeology; Heath (1985) <strong>and</strong> soils indicateoverbank deposits50 Percentage based on SNL/SCL soils; settingbased on productive aquifers <strong>and</strong> surficialgeology50 Percentage based on SNL/SCL soils; settingbased on productive aquifers <strong>and</strong> surficialgeology3 Till Over Sedimentary Rock 100 Based on principal aquifer <strong>and</strong> surficialgeology coveragesArkwright 8D Regolith 1 Metamorphic <strong>and</strong> Igneous 100 Most common Piedmont setting (residuum)Asheville 8B Alluvial Mountain Valleys 5 Alluvial Basins Valleys <strong>and</strong>FansBaldwin 7Ea River Alluvium WithOverbank DepositsBaldwin 7G Thin Till Over BeddedSedimentary Rock6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit100 Appropriate for alluvial blue ridge valley(colluvium)70 Percentage based on surficial geology (74%Floodplain <strong>and</strong> alluvium gravel terraces)3 Till Over Sedimentary Rock 30 Percentage based on surficial geology (74%Floodplain <strong>and</strong> alluvium gravel terraces)(continued)April 2010–Draft EPA document.C-2-1

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