Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...

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Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment Sediment Damage Table 6-3 Summary and Comparison of Candidate Plans – OSE Account Human Health and Safety Alternative 1 No Federal Action No effect Continued risk of loss-oflife due to dam failure from embankment cracking and/or overtopping. Land Rights and Relocations No effect No effect Alternative 2 Decommissioning Sponsor's Preferred/NED Plan Discharge to Vineyard Road FRS. Powerline sediment carried to Vineyard Road FRS. Un-safe dam removed. No impoundment of water for Powerline Channel. Land Use Breach of dam could limit downstream development Flood protection provided for the 100-year event Environmental Justice Municipal and Irrigation Water Transportation Potential to inundate residential structures from dambreak CAP canal subject to inundation in a dam break flood Continued risk of transportation infrastructure due to dam failure from embankment cracking or overtopping Flood protection provided for residential structures No effect Flood protection provided for public infrastructure The effects of the alternatives on resources of national recognition are summarized in Table 6-4. USDA- NRCS Page 6-12 January 2013 Kimley-Horn and Associates, Inc.
Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment Table 6-4 Effects of the Alternatives on Resources of National Recognition Types of Resources Air Quality Coastal Zone Endangered & Threatened Species Critical Habitat Fish and Wildlife Habitat Floodplains Historic and Cultural Properties Prime and Unique Farmland Water Quality Principal Sources of National Recognition Clean Air Act, as amended (42 USC 7401 et seq.) Coastal Zone Management Act of 1972, as amended (16 USC 1451 et seq.) Endangered Species Act of 1973, as amended (16 USC 1531 et seq.) Fish and Wildlife Coordination Act (16 USC 661 et seq.) Executive Order 11988, Flood plain Management National Historic Preservation Act of 1966, as amended (16 USC 470 et seq) CEQ Memorandum of August 1, 1980: Analysis of Impacts on Prime or Unique Agricultural Lands in Implementing the National Environmental Policy Act, Farmland Protection Policy Act of 1981. Clean Water Act of 1977, as amended (33 USC 1251 et seq.) Alternative 1 No Federal Action No effect No effect No effect No effect No effect No effect No effect No effect Measurement of Effects Alternative 2 Decommissioning Sponsor's Preferred/NED Plan Short-term minor adverse effect during construction. No effect No effect Short-term minor adverse effect during construction. Establish floodplain associated with channel. Sites in the APE that will not be subject to projectrelated impacts will be avoided by project implementation activities. Data recovery studies will be performed to mitigate impacts to all sites likely to suffer project-related impacts No effect No effect USDA- NRCS Page 6-13 January 2013 Kimley-Horn and Associates, Inc.
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DRAFT SUPPLEMENTAL WATERSHED PLAN A
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Powerline Flood Retarding Structure
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