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Dames & Moore, 1999 - USDA Forest Service

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8.3.3 Surface Water ..................................................................................................... 8-27<br />

8.3.4 Groundwater ....................................................................................................... 8-30<br />

8.3.5 Sediment .............................................................................................................. 8-31<br />

8.3.6 Other Media ......................................................................................................... 8-32<br />

8.4 CONTAMINANT PATHWAYS and chemical loading .............................................. 8-32<br />

8.4.1 General .......... .................... 8-32<br />

. .8.4.2 Overview of Site Geochemistry ......................................................... 8-33<br />

8.4.3 Westem Portion of Site ...................................................................................... 8-34<br />

- - ..<br />

b.4.4 Eastern portion of Site ..................................................................................... 8-35<br />

.<br />

8.4.5 Railroad Creek 8-37<br />

..................................................................................................<br />

8.5 RISKCHARACTERIZATION ...................... i ............................................................. 8-38<br />

8.5.1 Human Health ..................................................................................................... 8-38<br />

. 8.5.2 Ecological ........................................................................................................ 8-38<br />

9.0 . CONCLUSIONS AND RECOMMENDATIONS ...................................................................... 9-1<br />

9.1 OBJECTIVES OF THE RI ................................................. ..................................... 9-1<br />

9.2 CONCLUSIONS .......................................................................................................... 9-1<br />

9.2.1 Host Rock Mineralogy .......................................................................................... 9-1<br />

9.2.2 Site Surface WaterIGroundwater Interaction and Movement ............................... 9-2<br />

9.2.3 Surface Water Quality in Railroad Creek ............................................................. 9-2<br />

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

and . L Geochemistry Processes ......... : ................................................................. 9-2<br />

9.2.5 Sediment Quality .................................................................................................. 9-6<br />

9.2.6 Ecological Conditions ........................................................................... ............... 9-6<br />

9.2.7 Human Health and Ecological Risk Assessment .................................................. 0<br />

9-7<br />

9.2.8 Tailings Pile Slope Stability .......... ; ...................................................................... 9-9<br />

9.2.9 Windblown Tailings Material : 9-9<br />

....................................................................<br />

..........<br />

9.2.10 Riprap and Soil Source Evaluation . i ............................................................... 9-M9<br />

9.2.1 1 Winston Home Sites Fuel Storage Tanks ....... ; ................................................. 9-10<br />

9.3 POTENTIAL ENVIRONMENTAL CONCERNS ...................................................... 9-10<br />

9.3.1 Seasonal Exceedances of Water Quality Criteria .................. ; ..................... 9-10<br />

9.3.2 Reduction in Benthic Macroinvertebrate and Fish Populations ......................... 9-10<br />

9.3.3 Tailings Pile Slope Stability ............................................................................... 9-M I o<br />

9.3.4 Maintenance Yard .............................................................................................. 9-11<br />

9.3.5 Lagoon Soils 9-11<br />

....................................................................................................<br />

9.4 . RECOMMENDATIONS FOR PHASE I11 DATA COLLECTION ............................ 9-11<br />

9.4.1 Lucerne Bar Sampling ........................................ .............................................. 9-11<br />

10.0 PROJECT SCHEDULE ............................................................................................................ 10-1<br />

1 1.0 REFERENCES ......................................................................................................................... 11-1<br />

G:\wp&~11VX)5k~~eportsU10ldcn-2\riWoldcn2.d~<br />

17693-00S-019UuIy 29 . <strong>1999</strong>;12:54 PMiDRAFT FINAL RI REPORT<br />

.

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