Dames & Moore, 1999 - USDA Forest Service

3.0 REMEDIAL INVESTIGATION METHODOLOGIES ... ; ......................................................... a
3-1
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3; 1 TASK 1 . GEOLOGY AND SOILS INVESTIGATION .............................................. 3-2
3.1.1 Surface and Subsurface Soil Sampling ................................................................. 3-2
3.1.2 Seismic Refraction Survey ................................................................................... 3-4
3.1.3 Exploratory Test Pits and Sampling ..................................................................... 3-4
3.1.4 Borrow Source Evaluation .................................................................................... 3-5
3.1.5 Geologic Hazards Assessment ............................................................................... 3-6
3.2 TASK 2 . HYDROLOGIC INVESTIGATION ............................................................. 3-7
3.2.1 Streamflow Surveys ................................... ; .......................................................... 3-9
3.2.2 Water Quality Sampling .................................................................................... 3-10
3.2.3 -Storm Event Sampling ........................................................................................ 3-11
3.2.4 Geomorphologic Survey ..................................................................................... 3-11
3.3 TASK 3 . HYDROGEOLOGIC INVESTIGATION ................................................... 3-12
3.3.1 Groundwater Quality and Water Level Data Collection and Analytical ............. 3-12
3.4 TASK 4 . FLOCCULENT AND SEDIMENT ........... i ............................................... 3-15
3.4.1 Railroad Creek and Lake Chelan Sediment ........................................................ 3-15
3.4.2 Portal Drainage and Railroad Creek Flocculent ................................................. 3-16
3.4.3 Railroad Creek Streambed .................................................................................. 3-16
3.5 TASK 5 . MILL BUILDING ASSESSMENT ............................................................. 3-17
3.5.1 USGS Assessment of Mill Building-Related Salts and Unprocessed Ore ......... 3-17
. 3.5.2 Asbestos Assessment .......................................................................................... 3-18
3.6 TASK 6 . MINE ASSESSMENT ................................................................................ 3-18
3.6.1 Review of Aboveground and Underground Mine Maps ..................................... 3-18
3.6.2 Field Assessment of Aboveground Features .................................... ................ 3-18
3.7 TASK 7 . WINSTON HOME SITES ASSESSMENT ................................................ 3-19
3.8 TASK 8 . FIELD SCREENING .................................................................................. 3-19
3.9 TASK 9 . ECOLOGICAL SURVEYS ........................... ; ............................................. 3-20
3.9.1 Aquatic Biota ..................................................................................................... 3-20
3.9.2 Terrestrial Biota .................................................................................................. 3-27
3.10 TASK 10 . LABORATORY ANALYSIS AND QUALITY
ASSURANCEIQUALITY CONTROL ........................................................................ 3-28
3.10.1 Laboratory Analysis Procedures and Quality Assurance/Quality Control ...... 3-28
3.1 1 TASK 1 1 . DATA EVALUATION ............................................................................. 3-31
3.1 1.1 GeologicaVGeotechnical Data ............................ ; ............................................ 3-31
3.1 1.2 Mine Subsidence Potential Analysis ................................................................ 3-31
3.1 1.3 Surface Water Data ........................................................................................ 3-32
3.1 1.4 Groundwater Data ........................................................................................... 3-32
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3.12 TASK 12 . BASELINE RISK ASSESSMENT 3-33
4.0 PHYSICAL CHARACTERISTICS OF THE SITE ................................................ ................... 4-1
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4.1 PHYSICAL SETTING 4-1
4.1.1 Geographic Setting and Topography 4-1
4.1.2 Site Surface Features ............................................................................................ 4-2
4.1.3 Site Subsurface Features ..................................................................................... 4-11
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17693-005-019Uuly 29 . 1999;12:54 PM;DRAFI' FINAL RI REPORT