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similar to that of a hardpan. can delay the establishment of seedlings. Because <br /> This unit is used mainly as woodland and for the rooting depth is <br /> hay and pasture. restricted by the layer of glacial till,trees are <br /> Red alder and western redcedar are the main commonly subject to windthrow.This unit is used <br /> woodland species on this unit. On the basis of a for hay and pasture.The main limitation <br /> 50-year site curve,the mean site index is 90 for red is a seasonal perched water table. Grazing when <br /> alder.The mean annual increment at culmination the soil is wet results in compaction of the surface <br /> (CMAI)for red alder at age 40 is 101 cubic feet per layer, poor tilth, and excessive runoff. Excessive <br /> acre. Estimates of the site index or yield for water on the surface can be <br /> western redcedar have not been made. Among the removed by tile drainage systems if suitable outlets <br /> trees of limited extent is western hemlock. Among are available. Use of proper stocking rates, pasture <br /> the common forest understory plants are Oregon- rotation,and restricted grazing during wet periods <br /> grape, red huckleberry,trailing blackberry,western helps to keep the <br /> swordfern, and Oregon oxalis. pasture in good condition. <br /> The main limitation for the harvesting of timber Proper grazing practices,weed control,and <br /> is seasonal soil wetness,which limits the use of fertilizer are needed for maximum quality of forage. <br /> equipment to dry periods. Use of wheeled and Fertilizer is needed for optimum growth of grasses <br /> tracked equipment when the soil in this unit is wet and legumes. Legumes <br /> produces ruts,compacts the soil,and damages the benefit from applications of agricultural lime. <br /> roots of trees. The main limitation for building sites is ponding. <br /> Unsurfaced roads and skid trails are soft when Drainage is needed if buildings with basements <br /> wet,and they are impassable during rainy periods. and crawl spaces are constructed. <br /> Logging roads require suitable surfacing for year- The main limitations for septic tank absorption <br /> round use. Rock for road construction is not readily fields are depth to the dense glacial till,the <br /> available on this unit. seasonal perched water table, ponding,and <br /> Seedling mortality, brush competition, and moderately slow permeability. <br /> windthrow hazard are the main limitations in the Conventional septic tank absorption fields <br /> production of timber. If seed trees are present, often fail or do not function properly.The use of <br /> natural reforestation of cutover long absorption lines helps to compensate for the <br /> areas by red alder occurs periodically. moderately slow permeability. Drainage <br /> Western redcedar may be suitable for is needed if septic tank absorption fields are <br /> reforestation. Seasonal wetness and ponding installed. <br /> reduce root respiration,which results in high This map unit is in capability subclass IVw. <br /> seedling mortality.When openings are made in the <br /> canopy, invading brushy plants, if not controlled, <br />