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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 Description PercentageCommentHoot Lake 9E Outwash 8 Outwash 100 Based on productive aquifer, soils, surficialgeologyHugo 6Da Alternating S<strong>and</strong>stone,Limestone <strong>and</strong> Shale - ThinSoilHugo 6Fa River Alluvium WithOverbank DepositsHunter 4B Consolidated SedimentaryRockHuntington 4B Consolidated SedimentaryRock2 Bedded Sedimentary Rock 40 Percentage based on surficial geology;soil/regolith thickness inferred from Heath(1985)6 River Valleys <strong>and</strong> Floodplainswith Overbank DepositIntermountain 2E Playa Lakes 5 Alluvial Basins Valleys <strong>and</strong>Fans60 Percentage based on surficial geology; finesoils with about 10% SNL2 Bedded Sedimentary Rock 100 Setting based on aquifer <strong>and</strong> surficialgeology coverages2 Bedded Sedimentary Rock 100 Setting based on aquifer <strong>and</strong> surficialgeology coverages100 Setting based on surficial geology coverage,Heath (1985)J H Campbell 7F Glacial Lake Deposits 4 S<strong>and</strong> <strong>and</strong> Gravel 100 Based on surficial geology, soilsJ M Stuart 6E Solution Limestone 12 Solution Limestone 50 Percentage based on surficial geology; low(< 2%) SNLJ M Stuart 6Fa River Alluvium WithOverbank Deposits6 River Valleys <strong>and</strong> Floodplainswith Overbank Deposit50 Percentage based on surficial geology; low(< 2%) SNLJ R Whiting 7F Glacial Lake Deposits 4 S<strong>and</strong> <strong>and</strong> Gravel 100 Based on surficial geologyJackMcDonough8C Mountain Flanks 2 Bedded Sedimentary Rock 100 Assigned based on predominant surficialgeology (94% stony colluvium onmetamorphic rocks; less silt <strong>and</strong> clay than incolluvium over limestone)Jack Watson 10Ab Unconsolidated <strong>and</strong> Semi-Consolidated ShallowSurficial AquiferJames H MillerJr6DaAlternating S<strong>and</strong>stone,Limestone <strong>and</strong> Shale - ThinSoil10 Unconsolidated <strong>and</strong>Semiconsolidated ShallowAquifers100 Based on all coverages2 Bedded Sedimentary Rock 20 Percentage based on surficial geology; soilshave significant fines (SCL+SLT > 25%)(continued)April 2010–Draft EPA document.C-2-10

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