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212 -Hayrack -Muggins -Nutras complex <br />MAJOR MANAGEMENT FACTORS <br />Recreation <br />Havrack. Muoains. and Nutras <br />Soil-related factors: (Hayrack and Muggins -high shrink-swell potentiall, slow permeability, steep <br />slopes in some areas, high soil erosion hazard in the steeper areas, (Muggins and Nutras - <br />subsurface rock fragments) <br />Management considerations: <br />In the steeper areas, reduce soil erosion by disturbing only the part of the site that is used for <br />construction. <br />Foundation, concrete structures, and paved areas should be designed to offset the effects of <br />shrinking and swelling. <br />Higher construction and maintenance costs should be expected on this unit. <br />Woodland <br />Havrack. Muoains. and Nutras <br />Soil-related factors: steep slopes in some areas, high soil erosion hazard in the steeper areas, <br />moderate mass movement potential in the steeper areas, root limiting layer <br />• <br />Dominant vegetation in the potential plant community: Engelmann spruce - subalpine fir with an <br />understory of elk sedge, dwarf blueberry, common juniper, kinnikinnick <br />Annuat production of air-dry understory vegetation: 250 to 500 pounds per acre • <br />Mean site index for PIEN: 79 <br />Mean site index for ABLA: 69 <br />Management considerations: <br />To reduce compaction, use suitable methods of harvest, lay out skid trails in advance, and harvest <br />when the soil is least susceptible to compaction. <br />Using wheeled or tracked equipment on wet soil produces ruts, compacts the soil, and damages <br />tree roots. <br />Steep yarding paths, skid trails, and firebreaks are subject to rill and gully erosion. Plant cover or <br />water bars are needed. <br />The high clay content of these soils will retain a fair amount of moisture at tensions greater than <br />what is normally available to plants. Silviculturai practices that conserve soil moisture can result <br />in better growth and survival for regeneration. <br />Unsurfaced roads and skid trails may become impassable when wet. <br />• <br />Soils Description Report -West EIk Mine <br />December 1994 WESTEC 28 <br />