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PENSKE TRUCK LEASING EVERETT ONSITE IMPROVEMENTS CONSTRUCTION STORMWA TER POLLUTION PREVENTION PLAN Sitts & Hill Engineers, Inc. Job Number 17,710 this mixture at a rate of 60 pounds per acre. Consult Hydraulic Permit Authority (HPA) for seed mixes if applicable. Table 11-4.1.6 Wet Area Seed Mix* % Weight % Purity % Germination Tall or meadow fescue Festuca arundinacea or Festuca ela- 60-70 98 90 tior Seaside/Creeping bentgrass 10-15 98 85 Agrostis palustris Meadow foxtail 10-15 90 80 Alepocurus pratensis Alsike clover 1-6 98 90 Trifolium hybridum Redtop bentgrass 1-6 92 85 Agrostis alba Modified Briargreen, Inc. Hydroseeding Guide Wetlands Seed Mix • Table II-4.1.7 Meadow Seed Mix (p.282} lists a recommended meadow seed mix for infrequently maintained areas or non -maintained areas where colonization by native plants is desirable. Likely applications include rural road and utility right-of- way. Seeding should take place in September or very early October in order to obtain adequate establishment prior to the winter months. Consider the appro- priateness of clover, a fairly invasive species, in the mix. Amending the soil can reduce the need for clover. Table 11-4.1.7 Meadow Seed Mix '% Weigh % Purity % Germination Redtop or Oregon bentgrass 20 92 85 Agrostis alba or Agrostis oregonensi Red fescue 70 98 90 Festuca rubra White dutch clover 10 98 90 Trifolium repens • Roughening and Rototilling: The seedbed should be firm and rough. Roughen all soil no matter what the slope. Track walk slopes before seeding if engineering purposes require 2014 Stormwater Management Manual for Western Washington Volume 11- Chapter 4 - Page 282 SITTS & HILL ENGINEERS, INC. 32 TACOMA, WASHINGTON