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APPENDIX F.4 Aquatic Conservation Strategy Assessment

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APPENDIX F.4 Aquatic Conservation Strategy Assessment APPENDIX F.4 Aquatic Conservation Strategy Assessment Jordan Cove Natural Gas Liquefaction and Pacific Connector Gas Pipeline Project Draft EIS Appendix F4 Aquatic Conservation Strategy Assessment Pacific Connector Gas Pipeline Umpqua, Rogue River, and Winema National Forests Prepared for: USDA Forest Service Prepared by: Stantec February 2018 Table of Contents ACRONYMS USED ................................................................................................................................ VII 1.0 INTRODUCTION ........................................................................................................................ 1-1 1.1 Organization of this Assessment and Scale of Analysis ................................................. 1-5 1.2 Components of the Aquatic Conservation Strategy ......................................................... 1-7 1.2.1 Riparian Reserves ............................................................................................... 1-7 1.2.2 Key Watersheds .................................................................................................. 1-9 1.2.3 Watershed Analysis ............................................................................................ 1-9 1.2.4 Watershed Restoration ...................................................................................... 1-10 1.3 Determining Consistency with the ACS ........................................................................ 1-11 1.3.1 ACS Objectives................................................................................................. 1-11 1.3.2 Standards, Guidelines, and Management Direction .......................................... 1-12 1.3.3 Forest Service Decisions Related to the ACS ................................................... 1-18 1.3.4 Determining Consistency with the ACS at Multiple Scales ............................. 1-19 1.4 Environmental Consequences and Mitigation ............................................................... 1-25 1.4.1 General Construction and Stream Crossing Methods and Effects .................... 1-25 1.4.2 Mitigation ......................................................................................................... 1-63 2.0 AFFECTED ENVIRONMENT AND ENVIRONMENTAL CONSEQUENCES ...................... 2-1 2.1 Regional Context ............................................................................................................. 2-1 2.1.1 Key Watersheds .................................................................................................. 2-1 2.1.2 Historical Disturbance Processes and Patterns in the Pacific Northwest ............................................................................................................ 2-3 2.1.3 Klamath-Siskiyou Province, MP 47-105, 118-153 ............................................. 2-4 2.1.4 Cascades Province MP 105-113 ......................................................................... 2-5 2.1.5 High Cascades Province MP 153-180 ................................................................ 2-6 2.2 National Forest System Basins and Watersheds Crossed by the Project ......................... 2-7 2.2.1 Umpqua River Basin ........................................................................................... 2-9 2.2.2 Rogue River Basin ............................................................................................ 2-96 2.2.3 Klamath River Basin ....................................................................................... 2-162 3.0 BIBLIOGRAPHY Figures Figure 1-1 Regional and Provincial Setting of the Pacific Connector Gas Pipeline Route ............... 1-4 Figure 1-2 Matrix for Evaluation of Construction Impact and Site Response Potential ................. 1-28 Figure 1-3 Installation of a dam in a dry open cut crossing of a small channel .............................. 1-41 Figure 1-4 Preparation of perennial stream crossing with equipment bridges and sediment fence installed ................................................................................................................ 1-42 Figure 1-5 Dam-and-pump crossing of perennial stream with flume. ............................................. 1-42 Figure 1-6 Range of Predicted Severity Exposure Values (SEV) ................................................... 1-51 i Appendix F4 Aquatic Conservation Strategy Assessment Figure 1-7 Predicted Sediment Concentrations and Effects on Juvenile and Adult Salmonids for 1 and 5 Day Exposures ............................................................................................. 1-54 Figure 2-1. PCGP Right-of-Way with Aquatic Provinces and Fifth Field Watersheds ..................... 2-2 Figure2-2 PCGP Routing and Subwatershed Boundaries, Days Creek–South Umpqua River Watershed ...................................................................................................................... 2-12 Figure 2-3 PCGP Routing and Subwatershed Boundaries, Elk Creek–South Umpqua River Watershed ...................................................................................................................... 2-32 Figure2-4 PCGP Routing and Subwatershed Boundaries, Upper Cow Creek Watershed ............. 2-56 Figure 2-5 Natural Turbidity and Stored Sediment in the East Fork of Cow Creek ....................... 2-65 Figure 2-6 Current Seven-Day Average Maximum Temperatures, East Fork Cow Creek Perennial Streams .......................................................................................................... 2-67 Figure 2-7 Perennial Stream Channel Crossings in the East Fork Cow Creek Drainage ................ 2-73 Figure 2-8 East Fork Cow Creek Culvert. ....................................................................................... 2-89 Figure 2-9 PCGP Routing and Subwatershed Boundaries, Trail Creek Fifth-Field Watershed .... 2-100 Figure 2-10 PCGP Routing and Subwatershed Boundaries, Little Butte Creek Watershed ........... 2-122 Figure 2-11 Proposed Mitigation Projects, Rogue River National Forest Little Butte Creek ......... 2-155 Figure 2-12 PCGP Routing and Subwatershed Boundaries, Spencer Creek Watershed ................. 2-167 Figure 2-13 Mitigation Proposals on the Winema National Forest, Spencer Creek ........................ 2-188 Tables Table 1-1 Forest Service Land Allocations in Fifth-Field Watersheds Crossed by the Pacific Connector Project ............................................................................................................ 1-8 Table 1-2 Miles of PCGP Project Right-of-Way in Key Watersheds by Administrative Unit ........ 1-9 Table 1-3 Watershed Assessments Reviewed for Watersheds Affected by the Pacific Connector Project .......................................................................................................... 1-10 Table 1-4 Governing NWFP Standards and Guidelines Relevant to the ACS for Utility Corridors ........................................................................................................................ 1-14 Table 1-5 Agency Decisions with a Nexus to the ACS.................................................................. 1-18 Table 1-6 General Matrix of Factors and Indicators of Aquatic Health ......................................... 1-23 Table 1-7 Best Management Practices Common to All Crossings and to the Blue Category ....... 1-30 Table 1-8 Stream Channel Crossings, Blue Category .................................................................... 1-31 Table 1-9 Best Management Practices for Crossings in the Yellow and Orange Categories......... 1-34 Table 1-10 Stream Crossings in the Yellow Category ..................................................................... 1-36 Table 1-11 Best Management Practices for Crossings in the Green Category ................................ 1-37 Appendix F4 Aquatic Conservation Strategy Assessment ii Table 1-12 Stream Crossings in the “Green” Category.................................................................... 1-39 Table 1-13 Minimum Effective Ground Cover Requirements ......................................................... 1-55 Table 1-14 Habitat Elements, Processes, and Key Indicators for Evaluation of PCGP Project Effects and Identification of Mitigation Measures ........................................................ 1-64 Table 2-1 Miles of PCGP Project Right-of-Way in Key Watersheds by Administrative Unit ....... 2-3 Table 2-2 Provinces, River Basins and Watersheds on NFS Lands Subject to the ACS ................. 2-8 Table 2-3 Fifth-Field Watersheds and Land Allocations Crossed by the Pacific Connector Gas Pipeline Corridor ROW on NFS Lands .................................................................... 2-8 Table 2-4 Land Ownership and Forest Service Land Allocations (acres) in Days Creek–South Umpqua River Fifth-Field Watershed (HUC 1710030205) .......................................... 2-15 Table 2-5 Project Corridor (miles) and Project Area (acres) in Days Creek–South Umpqua River Fifth-Field Watershed (HUC 1710030205) by Land Ownership......................... 2-15 Table 2-6 Project Area (acres) on NFS Lands in the Days Creek–South Umpqua River Fifth- Field Watershed (HUC 1710030205)) by Land Allocation ........................................... 2-16 Table 2-7 Project Effects and Relevant Ecological Processes Described in the Days Creek– South Umpqua River Fifth-Field Watershed Assessment ............................................. 2-21 Table 2-8 Consistency of Project Effects
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