FERC Project No. 2337-077
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ENVIRONMENTAL ASSESSMENT FOR HYDROPOWER LICENSE Prospect No. 3 Project FERC Project No. 2337-077 Oregon Federal Energy Regulatory Commission Office of Energy Projects Division of Hydropower Licensing 888 First Street, NE Washington, DC 20426 October 2017 TABLE OF CONTENTS LIST OF FIGURES ................................................................................................. iv LIST OF TABLES.................................................................................................... v ACRONYMS AND ABBREVIATIONS............................................................... vii EXECUTIVE SUMMARY ..................................................................................... ix 1.0 INTRODUCTION ......................................................................................... 1 1.1 Application ......................................................................................... 1 1.2 Purpose of Action and Need for Power .............................................. 1 1.2.1 Purpose of Action .................................................................... 1 1.2.2 Need for Power ........................................................................ 3 1.3 Statutory and Regulatory Requirements ............................................ 3 1.3.1 Federal Power Act ................................................................... 3 1.3.2 Clean Water Act ...................................................................... 4 1.3.3 Endangered Species Act .......................................................... 5 1.3.4 Coastal Zone Management Act ............................................... 5 1.3.5 National Historic Preservation Act ......................................... 5 1.4 Public Review and Consultation ........................................................ 6 1.4.1 Scoping .................................................................................... 6 1.4.2 Interventions ............................................................................ 7 1.4.3 Comments on the License Application ................................... 7 2.0 PROPOSED ACTION AND ALTERNATIVES .......................................... 8 2.1 No-Action Alternative ........................................................................ 8 2.1.1 Existing Project Facilities........................................................ 8 2.1.2 Project Safety .......................................................................... 9 2.1.3 Existing Project Operation ...................................................... 9 2.1.4 Existing Environmental Measures ........................................ 10 2.2 Applicant’s Proposal ........................................................................ 10 2.2.1 Proposed Project Facilities .................................................... 10 2.2.2 Proposed Project Operations ................................................. 10 2.2.3 Proposed Environmental Measures ....................................... 10 2.2.4 Modifications to Applicant’s Proposal—Mandatory Conditions ........................................................................................ 12 2.3 Staff Alternative ............................................................................... 13 3.0 ENVIRONMENTAL ANALYSIS .............................................................. 16 3.1 General Description of the River Basin ........................................... 16 3.2 Scope of Cumulative Effects ............................................................ 17 3.2.1 Geographic Scope ................................................................. 18 3.2.2 Temporal Scope ..................................................................... 18 3.3 Proposed Action and Action Alternatives ........................................ 19 3.3.1 Geologic and Soil Resources ................................................ 19 3.3.2 Aquatic Resources ................................................................. 24 3.3.3 Terrestrial Resources ............................................................. 75 ii 3.3.4 Threatened and Endangered Species ..................................... 88 3.3.5 Recreation and Land Use ...................................................... 93 3.3.6 Aesthetics .............................................................................. 96 3.3.7 Cultural Resources ................................................................ 98 3.4 No-Action Alternative .................................................................... 107 4.0 DEVELOPMENTAL ANALYSIS ........................................................... 107 4.1 POWER AND DEVELOPMENTAL BENEFITS OF THE PROJECT ........................................................................................................ 108 4.2 COMPARISON OF ALTERNATIVES ......................................... 109 4.2.1 No-action Alternative .......................................................... 109 4.2.2 Applicant’s Proposal ........................................................... 109 4.2.3 Staff Alternative .................................................................. 109 4.3 COST OF ENVIRONMENTAL MEASURES.............................. 110 5.0 CONCLUSIONS AND RECOMMENDATIONS .................................... 116 5.1 Comparison of Alternatives ........................................................... 116 5.2 Comprehensive Development and Recommended Alternative ..... 116 5.3 Unavoidable Adverse Effects ......................................................... 134 5.4 Summary of Section 10(j) Recommendations and 4(e) conditions 135 5.4.1 Recommendations of Fish and Wildlife Agencies .............. 135 5.4.2 Land Management Agency’s Section 4(e) Conditions ....... 146 5.5 Consistency with Comprehensive Plans ........................................ 146 6.0 FINDING OF NO SIGNIFICANT IMPACT ........................................... 148 7.0 LITERATURE CITED .............................................................................. 149 8.0 LIST OF PREPARERS ............................................................................. 152 iii LIST OF FIGURES Figure 1. Location of Prospect No. 3 Hydroelectric Project (Source: PacifiCorp License Application). .................................................................................... 2 Figure 2. Periodicity of rainbow and cutthroat trout in the Rogue River Basin (source: PacifiCorp, 2003). ....................................................................................... 29 Figure 3. Percent of maximum average weighted suitability for target cutthroat and rainbow life stages (Source: license application as modified by staff). ..... 34 iv LIST OF TABLES Table 1. Water quality standards applicable to the project (Source: license application as modified by staff). ................................................................ 24 Table 2. Bypassed reach trout snorkel survey results by size class for each of three sampling reach (Source: license application as modified by staff). ........... 30 Table 3. Percent exceedance levels for average monthly flows at historic USGS gage no. 14332000 in the bypassed reach (Source: license application as modified by staff). ....................................................................................... 35 Table 4. Percent change in average weighted suitability for cutthroat trout fry and juvenile life stages in upper South Fork bypassed reach between existing, bypassed reach median flows and proposed or recommended minimum flows (Source: PacifiCorp, 2015a as modified by staff). .......... 36 Table 5. Percent change in average weighted suitability for cutthroat trout adult and spawning life stages in upper South Fork bypassed reach between existing, bypassed reach median flows and proposed or recommended minimum flows (Source: PacifiCorp, 2015a as modified by staff). .......... 37 Table 6. Percent change in average weighted suitability for target rainbow trout life stages in upper South Fork reach between existing, bypassed reach median flows and proposed or recommended minimum flows (Source: PacifiCorp, 2015a as modified by staff). ..................................................... 38 Table 7. Summary of fish ladder measurements under low-flow conditions and whether they meet Oregon DFW recommended criteria (Source: license application as modified by staff). ................................................................ 45 Table 8. Summary of fish ladder measurements under high-flow conditions and whether they meet Oregon DFW recommended criteria (Source: license application as modified by staff). ................................................................ 46 Table 9. Fish screen hydraulic measurements under low-flow conditions (Source: license application and PacifiCorp, 2016a, as modified by staff). ............... 52 Table 10. Fish screen hydraulic measurements under high-flow conditions after baffle adjustments (Source: license application and PacifiCorp, 2016a, as modified by staff). ....................................................................................... 53 Table 11. Summary of fish screen biological evaluation results (Source: license application). ................................................................................................. 55 Table 12. Fish Passage Facilities Operation and Maintenance Plan Schedule of Activities (Source: PacifiCorp, 2016c). ..................................................... 59 Table 13. Special-status plant species identified in