Laserfiche WebLink
SEED MIX FOR GRASS SWALES AND BIOFILTRATION SWALES: <br />(all percentages by weight) <br />Meadow Foxtail <br />(Alonecurus oratensis) <br />Alta Fescue <br />(Festuca pratensis) <br />Redtop Bent Grass <br />(Agrostis alba) <br />Red Fescue <br />(Festuca rubra) <br />IIirdsfoot Trefoil <br />( otus corniculatus) <br />40% <br />25$ <br />20$ <br />10$ <br />5$ <br />ADDITIONAL VEGETATION FOR 9IOFILTRATION SNALES (alant all <br />s�eciesl• <br />Slough Sedge <br />(Carex obnunta) <br />Spike Rush <br />(Eleocharis palustris) <br />Soft Rush <br />(Juncus effusus) <br />Small-fruited Bulrush <br />(Scirous microous) <br />25 clumps per 100 square <br />feet of swale bottom <br />25 clumps per loo square <br />feet of swale bottom <br />25 clumps per 100 square <br />feet of swale bottom <br />25 clumps per 100 square <br />feet of swale bottom <br />Note: Cattails (�oha latifolia) may be used in place of <br />any of the above species in biofiltration swales expected to <br />have ponded or standing water. <br />To�soil Type A- excerpts from WSDOT, APWA std 9-14.1(1) <br />with City modification. <br />Topsoil shall be free from materials toxic to plant growth, <br />noxious weeds, rhizomes, roots, subsoil, stones, and other <br />debris. 100� of the topsoil shall pass through a 1/2 inch <br />sieve. <br />Topsoil Type A shall consist of a sandy clay loam, sandy <br />loam, loam, clay loam, silty clay loam, or silt loam soil. <br />The mix may not be more than 50� sand nor 20$ clay. Total <br />organic matter shall be 1� to lo�. A maximum of 20� of the <br />mix volume may be retained on a 1/4" sieve. <br />