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CON3TRUCTION OF VEGETATED SWALES• <br />Prepare the swale for sod immediately after it has been <br />graded. Roughen the bottom and sides of the swale by <br />raking, place 4�' (minimum) of topsoil, and fertilize with an <br />feet�before layingithe aodtheInageneral,lusepar10�20-20 (Ne <br />P-K) fertilizer. However use a <br />fnr�tii__� ,� .. � nOn-bhosnhnrne ����_r_r___ <br />No E: Topsoil shall meet the standard for Topsoil Type A, <br />as specified in section 9-14.1(1) of the 1991 Standard <br />Specifications for Road, Hridge, and Municipal Construction <br />(WSDOT, APWA) with the following modification - 300$ of the <br />topaoil shall pass through a 1/2�� sieve. <br />Sod the swale immediately after the sides and bottom of the <br />swale have been prepar_ed. Lay sod to a minimum of 1.0 feet <br />of vertical depth above the bottom of the swale. Anchor the <br />sod in place in the bottom of the swale and to 1.0 feet of <br />vertical depth above the bottom of the swale with stakes, <br />metal staples or other means. <br />NOTE: Lay the sod pieces with their long axis perpendicular <br />to the direction of flow in the swale, and stagger the <br />pieces to avoid a continuous longitudinal seam in the bottom <br />of the swale. <br />Hand-seed or hydroseed the swale with the specified seed mix <br />in addition to sodding. If the swale is completed between <br />April 1 and September ]., hand-seed the swale immediately. <br />If the swale is completed between September 1 and April 1, <br />hand-seed after April 1, but before April 30, of the spring <br />following completion. Disperse 5 lbs of seed per 1000 <br />square feet evenly over the sod and all bare areas of the <br />swale. <br />To plant wetland vegetation <br />swales, punch holes in the <br />approximately equivalent to the <br />wads. Insert the plants in the <br />earth down around the plants. <br />ottom of the swale only and in <br />a straight line. <br />required for biofiltration <br />sod with a bar or stake <br />diameter of the plants' root <br />holes and tamp the sod and <br />Locate the plants in the <br />s staggered pattern - not in <br />NOTE: Wetland vegetation planted after March 15 will <br />require irrigation through the first summer to ensure plant <br />viability. Aetland olants ideallv shou�d be nlanted between <br />october and March. <br />