Botany and Wetlands Study Report - McMillen, LLC

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Botany and Wetlands Study ReportSoutheast Alaska Power AgencyTABLE OF CONTENTS1 Introduction ........................................................................................................... 11.1 Project Description .......................................................................................................... 11.2 Purposes of the 2012 Environmental Field Program ....................................................... 11.3 Changes Made to the Study Plan in Response to Comments or Permit Conditions ....... 31.4 Compliance with Permit Terms, Conditions, and Regulatory Framework ...................... 31.4.1 Tongass Land and Resource Management Plan ............................................ 31.4.2 Clean Water Act ............................................................................................ 51.4.3 Other Regulations ......................................................................................... 52 Procedures ............................................................................................................. 62.1 Analysis Area ................................................................................................................... 62.2 Pre‐Field Contact with Forest Service and Review of Existing Information .................... 62.3 Field Investigation Surveys .............................................................................................. 72.3.1 Sensitive and Rare Plants .............................................................................. 72.3.2 Wetland Resources ....................................................................................... 73 Environmental Setting ........................................................................................... 83.1 Vegetation Resources ...................................................................................................... 83.2 Sensitive Plants ................................................................................................................ 93.3 Rare Plants ....................................................................................................................... 93.4 Plant Species Newly Documented in Alaska .................................................................. 123.5 General Vegetation Types ............................................................................................. 123.6 Invasive Plants ............................................................................................................... 143.7 Wetland Resources ........................................................................................................ 143.7.1 Forested Wetlands ...................................................................................... 163.7.2 Emergent Sedge Wetlands .......................................................................... 163.7.3 Moss Muskegs ............................................................................................. 164 Project Effects ...................................................................................................... 174.1 Identified Issues and Concerns for Sensitive Plants ...................................................... 174.1.1 Spatulate moonwort (Botrychium spathulatum W.H.Wagner) ................ 18Swan Lake Hydroelectric Project January 2013FERC Project No. 2911 Page i Version: Agency Review
Botany and Wetlands Study ReportSoutheast Alaska Power Agency4.1.2 Edible thistle (Cirsium edule var. macounii (Greene) D.J.Keil) .................... 184.1.3 Mountain lady’s slipper (Cypripedium montanum Douglas ex Lindl.) ........ 184.1.4 Large Yellow Lady’s Slipper Orchid (Cypripedium parviflorum Salisb. var.pubescens (Willdenow) O. W. Knight) ......................................................... 194.1.5 Calder’s lovage (Ligusticum calderi Math. & Const.) .................................. 194.1.6 Alaska Rein Orchid (Piperia unalascensis (Spreng.) Rydb.) ......................... 194.1.7 Lesser Round‐Leaved Orchid (Platanthera orbiculata (Pursh) Lindl.) ......... 204.1.8 Kruckeberg’s swordfern (Polystichum kruckebergii W.H. Wagner) ........... 204.2 Identified Issues and Concerns for Rare Plants ............................................................. 214.2.1 Maidenhair spleenwort (Asplenium trichomanes L. ssp. trichomanes) ...... 214.2.2 Brightgreen spleenwort (Asplenium trichomanes‐ramosum L.) ................. 214.2.3 Boreal bedstraw (Galium kamtschaticum Steller ex Schult & Schult) ........ 224.2.4 Northern bugleweed (Lycopus uniflorus Michx.) ........................................ 224.2.5 Bog adder’s‐mouth orchid (Malaxis paludosa (L.) Swartz) ......................... 234.2.6 Choris’ bog‐orchid (Platanthera chorisiana (Cham.) Reichenb.) ................ 244.2.7 Pacific Buttercup (Ranunculus pacificus (Hulten) L.D.Benson) ................... 244.3 Identified Issues and Concern for Plants Newly Documented in Alaska ....................... 254.3.1 Wallace’s spikemoss (Selaginella wallacei Heiron.) .................................... 254.3.2 Bog St. John’s‐wort (Hypericum anagalloides Cham. & Schltdl.) ................ 264.4 Management Requirements and Mitigation Measures for Sensitive and Rare Plants . 264.5 Identified Issues and Concerns for General Vegetation ................................................ 274.5.1 Old‐Growth Forest ...................................................................................... 274.5.2 Young Growth Forest .................................................................................. 284.6 Management Requirements and Mitigation Measures for General Vegetation .......... 284.7 Identified Issues and Concerns to Wetland Resources ................................................. 284.7.1 Effects from Rising Reservoir Levels Within the Analysis Area ................... 294.7.2 Effects from Construction Activities Outside the Analysis Area ................. 294.8 Management Requirements and Mitigation Measures for Wetland Resources .......... 305 References ........................................................................................................... 30Swan Lake Hydroelectric Project January 2013FERC Project No. 2911 Page ii Version: Agency Review
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