Final Site Information Package for National Remedy Review Board ...

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SITE INFORMATION PACKAGE FOR NATIONAL REMEDY REVIEW BOARD PART B, SECTION 8: DESCRIPTION OF ALTERNATIVES assess whether remedy protection projects could improve the long-term effectiveness and permanence of the in-place barriers within each community. The two remedy protection alternatives are described below. Remedy Protection Description Alternative Alternative RP-1 No Further Action (Post-Event Response) Alternative RP-2 Modifications to Selected Remedies to Enhance Protectiveness (Remedy Protection Projects) • Alternative RP-1: No Further Action (Post-Event Response). Alternative RP-1 would not modify any of the existing conditions in the Upper Basin to increase the current level of long-term permanence of the existing selected remedies. Alternative RP-1 assumes that property owners would continue to comply with the ICP. The ICP is implemented by the Panhandle Health District and regulates excavation activities and contaminant migration away from properties for purposes of long-term maintenance of the selected remedies. If the existing selected remedies were damaged during storm events and this damage posed risks to human health and/or the environment that warranted response actions to reduce the risks, USEPA and state agencies would determine the best tools for addressing such contamination. In the event of catastrophic flooding, USEPA, other federal agencies, and state agencies would evaluate response needs as appropriate. Because various amounts of the existing selected remedies are expected to be damaged during storm events, based on hydrologic and hydraulic analyses conducted as part of the FFS, Alternative RP-1 includes the estimated costs for repair of the selected remedies in the eight Upper Basin communities. Although detailed analyses were not conducted for the side gulches (i.e., drainages located outside the eight Upper Basin communities), the expected damage due to storm events was estimated based on the trends found in the hydrologic and hydraulic analyses of the Upper Basin communities. • Alternative RP-2: Modifications to Selected Remedies to Enhance Protectiveness (Remedy Protection Projects). Alternative RP-2 is composed of combinations of various technology and process options to protect the existing selected remedies against flooding and high precipitation events up to the 50-year storm event (Table B8-3). Each community has different water conveyance infrastructure-related issues that pose risks to the selected remedies. These water conveyance issues depend on the geography and changing environmental conditions common to mountainous drainage areas. General technologies and process options that could be applicable to remedy protection projects were developed from common engineering practice for stormwater conveyance projects. The technologies and process options identified to mitigate the risks posed to the existing selected remedies in Alternative RP-2 were determined based on current existing conditions in each community area, and the hydrologic and hydraulic analyses. For the purposes of this evaluation, the Alternative RP-2 remedy protection projects and estimated costs were preliminarily defined for each of the eight communities. Although detailed analyses were not conducted for the side gulches, approximate costs to address problems in the side gulches were developed for Alternative RP-2 based on the trends found in the analysis of the Upper Basin communities. These costs represent estimates of B8-8
SITE INFORMATION PACKAGE FOR NATIONAL REMEDY REVIEW BOARD PART B, SECTION 8: DESCRIPTION OF ALTERNATIVES the resources it would take to implement expected remedy protection projects in the side gulches based on trends observed in the development of Alternative RP-2 for the eight Upper Basin communities. B8-9
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United States Environmental Protect
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Contents Acronyms and Abbreviations
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SITE INFORMATION PACKAGE FOR NATION
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Acronyms and Abbreviations µg/dL m
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RAO remedial action objective RI/FS
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Page 15 and 16: SITE INFORMATION PACKAGE FOR NATION
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Page 65: Remedial Alternative Description SI
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Page 93 and 94: COMMISSIONERS: PFfifiY WHITF CLERK
Page 95 and 96: Dan Opalski, U.S. EPA March 10,2010
Page 97 and 98: Dan Opalski, U.S. EPA March 10, 201
Page 99: Dan Opalski, U.S. EPA March 10,2010
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Rose Lake ll n e §¨¦ 90 DUDLEY "
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1992-1994 Removal of tailings and c
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The box plot shows the median or 50
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! ( ! ! ( ! ! ! Upper Basin Coeur d
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DUDLEY ") §¨¦ 90 ") St Joe River
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Base Map Data: NHDPlus (Rivers, Wat
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[Two Updated Updated Woodland Ecolo
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Ninemile Creek WALLACE BUNN Upper B
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OSBURN §¨¦ 90 Upper Basin Coeur
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176 E Upper Basin Coeur d'Alene Riv
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§¨¦ 90 ENAVILLE The Bunker Hill
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E 169 §¨¦ 90 Upper Basin Coeur d
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TABLE B2-1 Summary of Ongoing Data
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TABLE B4-2 Screening Level Exceedan
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TABLE B7-1 Preliminary Remediation
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TABLE B8-1 Descriptions of Typical
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TABLE B8-2 Summary of Alternatives
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TABLE B9-1a Comparative Analysis of
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TABLE B9-1b Comparative Analysis of
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TABLE B11-1 Legend of Bureau of Lan
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TABLE B11-1 Legend of Bureau of Lan
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TABLE B11-2 Summary of Estimated Po
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TABLE B11-4 Summary of Remedy Prote
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TABLE B14-1 Estimated Costs Summari
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TABLE B14-2 Summary of Estimated Co
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TABLE B14-2 Summary of Estimated Co
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