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Table 11-3.4: Temporary and Permanent Seed Mixes (continued) <br />Common Name <br />Latin Name <br />% Weight <br />% Purity <br />% Germination <br />aces or Festuca <br />cue <br />elatior <br />Seaside/Creeping <br />Agrostis palustris <br />10-15 <br />92 <br />85 <br />bentgrass <br />Redtop bentgrass <br />Agrostis alba or <br />5-10 <br />90 <br />80 <br />Agrostis gigantea <br />Wet Area Seed Mix <br />A low -growing, relatively non-invasive seed mix appropriate for very wet areas that are not regulated wet- <br />lands. Consult Hydraulic Permit Authority (H PA) for seed mixes if applicable. <br />Tall or meadow fes- <br />Festuca arundin- <br />acea or Festuca <br />60-70 <br />98 <br />90 <br />cue <br />elatior <br />Seaside/Creeping <br />Agrostis palustris <br />10-15 <br />98 <br />85 <br />bentgrass <br />Meadow foxtail <br />Alepocurus praten- <br />10-15 <br />90 <br />80 <br />sis <br />Alsike clover <br />Trifolium hybridum <br />1-6 <br />98 <br />90 <br />Redtop bentgrass <br />Agrostis alba <br />1-6 <br />92 <br />85 <br />Meadow Seed Mix <br />A recommended meadow seed mix for infrequently maintained areas or non -maintained areas where col- <br />onization by native plants is desirable. Likely applications include rural road and utility right-of-way. Seed- <br />ing should take place in September or very early October in order to obtain adequate establishment prior to <br />the winter months. Consider the appropriateness of clover, a fairly invasive species, in the mix. Amending <br />the soil can reduce the need for clover. <br />Redtop or Oregon <br />Agrostis alba or <br />bentgrass <br />Agrostis ore- <br />20 <br />92 <br />85 <br />gonensis <br />Red fescue <br />Festuca rubra <br />70 <br />98 <br />90 <br />White dutch clover <br />Trifolium repens <br />10 <br />98 <br />90 <br />Roughening and Rototilling <br />. The seedbed should be firm and rough. Roughen all soil no matter what the slope. Track walk <br />slopes before seeding if engineering purposes require compaction. Backblading or smoothing <br />of slopes greater than 4H:1 V is not allowed if they are to be seeded. <br />Restoration -based landscape practices require deeper incorporation than that provided by a <br />simple single -pass rototilling treatment. Wherever practical, initially rip the subgrade to <br />improve long-term permeability, infiltration, and water inflow qualities. At a minimum, <br />2019 Stormwater Management Manual for Western Washington <br />Volume 11 - Chapter 3 - Page 287 <br />