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i <br /> � . <br /> SEED MIX FOR GRASS SWALES AND BIOFILTRATION SW LES: <br /> (all percentages by weight) <br /> � Meadow Foxtail <br /> (�looecurt�s nratensis) 40� <br /> Alta Fescue <br /> ( estuca arat�is� 25� <br /> Redtop Bent Grass <br /> ( o t's a b ) Zo� <br /> � Red Fescue <br /> � ( es uc rubr�� lo� <br /> Birdsfoot Trefoil <br /> (Lstus corni_ '��tus� 5$ <br /> spec1esNA VEGEmATION Fo1� BIOFILTRATrnu CfTT , <br /> - lant aa�� <br /> Slough Sedge <br /> (Carex obnuota) z5 clumps per 100 square <br /> feet of swale bottom <br /> Spike Rush <br /> (Eleoc aris palust_is� Z5 clumps per l00 square <br /> feet of swale bottom <br /> Soft Rush <br /> (Juncus ef�usus) 25 clumps per 100 square <br /> feet of swale bottom <br /> Small-fruited Bulrush <br /> (sciraus microous) 25 clumps per 100 square <br /> feet of swale bottom <br /> ote: Cattails (Tvnha lat�ia� may be used in place of <br /> any of the above species in biofiltration swales expected to <br /> have ponded or standing water. <br /> Topsoi_ l�pe 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 /> j The mix may not be more than 50� sand nor 20� cla <br /> , oY'ganic matter shall be 1� to lo�. A maximum of 20� oftthe <br /> mix volume may be retained on a 1/4" sieve. <br /> ( <br />