Dames & Moore, 1999 - USDA Forest Service

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5.3 SURFACE WATER .................... : ................................................................................ 5-13
5.3.1 Background Surface Water Quality in Railroad Creek ...................................... 5-15
5.3.2 Stehekin River Watershed .................................................................................. 5-20
5.3.3 Railroad Creek .................................................................................................... 5-21
5.3.4 Portal Drainage ................................................................................................... 5-31
5.3.5 Copper Creek Diversion ........................ ; ............................................................ 5-34
5.3.6 Copper Creek ...................................................................................................... 5-35
5.3.7 Other Railroad Creek Tributaries ....................................................................... 5-36
5.3.8 Lake Chelan ...................................... i.. .......... !
537
5.3.9 Surface Water Quality Summary 5-37
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5.4 GROUNDWATER ........................................ 5-38
5.4.1 Regional Groundwater Quality ........................................................................... '5-40
5.4.2 Site Groundwater Quality ................................................................................... 5-41
5.4.3 Interstitial pore Water Data and Mill Building Drip Water .................. i ............ 5-54
5.4.4 Groundwater Summary . 5-55
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5.5 SEDIMENT 5-55
5.5.1 Railroad Creek ......................................... 5-55
5.5.2 Lake Ctielan-Lucerne Bar and Stehekin ............................................................. 5-56
5.5.3 Summary .......................................................... .................................................. 5-57
5.6 OTHER MEDIA ............................................................. ............................................. 5-57
5.6.1 Ferricrete ....................... ..................................................................................... 5-58
5.6.2 Flocculent ........................................................................................................... 5-58
5.6.3 Portal Film .......................................................................................................... 5-58
5.6.4 Concentrate ........................................................................................... ............. 5-58
5.7 AIR ............................................................................................................................... 5-58
5.8 ASBESTOS .................................................................................................................. 5-59
5.9 WINSTON HOMESITE UNDERGROUND STORAGE TANKS ............................. 5-59
6.0 TRANSPORT AND FATE OF COMPOUNDS OF POTENTIAL CONCERN ........................ 6-1
6.1 SITE CONDITIONS ........................................................................ .................. ........... 6-2
6.1.1 Bedrock Geology and Mineralogy ....................................................................... 6-2
6.1.2 Mineralogy of Secondary Minerals ...................................................................... 6-4
6.1.3 Hydrology/Hydrogeology ..................................................................................... 6-5
6.2 . GEOCHEMISTRY INTERPRETATION TOOLS : .................... ................................. 6-7
6!2.1 Contribution of Primary Minerals ............... : ......:.......... ........................................ 6-7
6.2.2 Formation of Secondary Minerals ................................ .6-8 1
6.3 .GENERAL CHEMICAL PROCESSES OPERATING AT THE HOLDEN
MIBE SITE .................................................................................................................... 6-9
6.3.1 Chemical Rock Weathering Processes and Leaching of Metals ........................... 6-9
6.3.2 Seasonal Leaching Effects ................................................... : .............................. 6-12
6.3.3 Natural Metal Removal Processes ................... .................................................. 6-13
6.3.4 Conclusions ........................................................................................................ 6-18
6.4 EVIDENCE AND IMPLICATIONS OF GENERAL CHEMICAL PROCESSES
AT THE HOLDEN MINE SITE ..................................................... : ............................. 6-18
6.4.1 Evidence of Iron Sulfide Mineral Oxidation ........................................... .......... 6-19
6.4.2 Evidence of Oxidation of Sphalerit .................................................................... 6-19
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17693-005-019Vuly 29 . 1999;12:54 PM;DRAFT FINAL RI REPORT
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