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Dames & Moore, 1999 - USDA Forest Service

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....<br />

TABLE OF CONTENTS<br />

EXECUTIVE SUMMARY ................................................................................................................. E - 1<br />

Page<br />

INTRODUCTION .................................................................................................................... E - 1<br />

SITE DESCRIPTION AND BACKGROUND .......................................... .............................. ES 1<br />

KEY FINDINGS ....................................................................................................................... ES-4<br />

Host Rock Mineralogy ................................................................................................. ES-4<br />

Site Surface Water/Groundwater Interaction and Movement ...................................... ES-4<br />

Surface Water Quality in Railroad Creek ..................................................................... ES-5<br />

Component Inflow Sources and Transport Mechanisms to Railroad Creek and<br />

Geochemistry Processes .................................................................................. ES-5<br />

Sediment Quality .......................................................................................................... ES-9<br />

Ecological Conditions .................................................................................................. ES-9<br />

Human Health and Ecological Risk Assessment ....................................................... .E S- 10<br />

Tailings Pile Slope Stability' ........................................................... .......................... ES 12<br />

Windblown Tailings Material .................................................................................... ES 13<br />

Riprap and Soil Source Evaluation ........ ; ................................................................... ES 13<br />

Winston Home Sites Fuel Storage Tanks ........................................ ..................... ES 13<br />

POTENTIAL ENVIRONMENTAL CONCERNS ................................................................ E - 13<br />

Seasonal Exceedances of Water Quality Criteria ....................................................... ES- 13<br />

Reduction in Benthic Macroinvertebrate and Fish Populations ................................. ES-13<br />

Tailings Pile Slope Stability ....................................................................................... ES 14<br />

Maintenance Yard .................................................................................................... E - 14<br />

Lagoon Soils .................................... : .......................................................................... ES- 14<br />

RECOMMENDATIONS FOR PHASE I11 DATA COLLECTION ......... ; ............................. ES- 14<br />

Lucerne Bar Sampling ................................................................................................ ES-15<br />

1.0 INTRODUCTION ....................................................................................................................... 1-1<br />

1 . 1 BACKGROUND ............................................................................................................ 1-2<br />

1.2 PURPOSE OF THE RI INVESTIGATION ................................................................... 1-3<br />

I . 3 REPORT'ORGANIZATION .......................................................................................... 1-4<br />

2.0 SITE DESCRIPTION AND BACKGROUND ........................................................................... 2-1<br />

2.1 ' SITE DESCRIPTION ...................................................... ......................... ................... 2-1<br />

2.2 HISTORY OF SITE AND SURROUNDING AREA .................................................... 2-1<br />

2.2.1 Lake Chelan Basin ................................................................................................ 2-1<br />

2.2.2 Railroad Creek Watershed .................................................................................... 2-2<br />

2.3 . SITE DEVELOPMENT CHRONOLOGY ..................................................................... 2-2<br />

2.4 PREVIOUS INVESTIGATIONS AND STUDIES ....................................................... 2-4<br />

2.5 SUMMARY OF ISSUES OF POTENTIAL CONCERN .............................................. 2-5<br />

G:\wpdata\OOJLcpoNUIoldcn-2\ri\HoldcnZ<br />

17693-005-0 19Uuly 29 . <strong>1999</strong>;12:54 PM;DRAFT FLNAL RI REPORT

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