2320 RAILWAY AVE INTERWEST CONSTRUCTION INC 2023-06-12

INTER WEST — EVERETT CONTRACTOR'S YARD INTERIM FILL PROJECT ' CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN Sitts & Hill Engineers, Inc. Job Number 17,733 . Irrigation. • Reapplication of mulch. • Repair of faded slope surfaces. This technique works with standard hydromulch (1,500 pounds per acre minimum) and BFM/MBFMs (3,000 pounds per acre minimum). . Seed may be installed by hand if: . Temporary and covered by straw, mulch, or topsoil. • Permanent in small areas (usually less than 1 acre) and covered with mulch, topsoil, or erosion blankets. • The seed mixes listed in the tables below include recommended mixes for both temporary and permanent seeding. . Apply these mixes, with the exception of the wetland mix, at a rate of 120 pounds per acre. This rate can be reduced if soil amendments or slow - release fertilizers are used. • Consult the local suppliers or the local conservation district for their recom- mendations because the appropriate mix depends on a variety of factors, including location, exposure, soil type, slope, and expected foot traffic. Altern- ative seed mixes approved by the local authority may be used. . Other mixes may be appropriate, depending on the soil type and hydrology of the area. . Table 11-4.1.2 Temporary Erosion Control Seed Mix (p 280) lists the standard mix for areas requiring a temporary vegetative cover. Table II-4.1.2 Temporary Erosion Control Seed Mix Weigh % Purity'% Germination Chewings or annual blue grass 40 98 90 Festuca rubra var. commutata or Poa anna Perennial rye 50 98 90 Lolium perenne Redtop or colonial bentgrass 5 92 85 Agrostis alba or Agrostis tenuis White dutch clover 5 98 90 Trifolium repens Table II-4.1.3 Landscaping Seed Mix (p.281) lists a recommended mix for land- scaping seed. 2014 Stormwater Management Manual for Western Washington Volume Il - Chapter 4 - Page 280 SITTS & HILL ENGINEERS, INC. 32 ' TACOMA, WASHINGTON