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KITTITAS COUNTY SOLID WASTE ON-CALL <br />CLE ELUM TRANSFER STATION FRONT ENTRANCE DESIGN <br />PW\JA\KITTCO02\ENTRANCE TEMPORARY EROSION AND <br />JUNE 2023 SEDIMENT CONTROL <br />©COPYRIGHT 2023 JACOBS 01 57 13 - 11 <br />D. Plastic Covering: Use clear plastic covering to promote seed germination <br />when seeding is performed outside of specified dates. Use black plastic <br />covering for stockpiles or other areas where vegetative growth is unwanted. <br />Place plastic with at least a 12-inch overlap of all seams. Install and maintain <br />plastic cover to prevent water from cutting under the plastic and to prevent <br />cover from blowing open in the wind. <br />E. Silt (Sediment) Fence: <br />1. Silt fence shall be installed in accordance with the Drawings. When <br />backup support is used, use steel wire with a maximum mesh spacing of <br />2 inches by 4 inches, or plastic mesh as resistant to ultraviolet radiation <br />as the geotextile it supports. Provide wire or plastic mesh with strength <br />equivalent to or greater than as required for unsupported geotextile (for <br />example, 180 pounds grab tensile strength in the machine direction). <br />2. Attach geotextile to posts and support system using staples, wire, or in <br />accordance with manufacturer’s recommendations. Geotextile shall be <br />sewn together at the point of manufacture, or at a location approved by <br />Engineer, to form geotextile lengths as required. <br />3. Provide wood or steel support posts at sewn seams and overlaps and as <br />shown on the Drawings and necessary to support fence. <br />4. Wood Posts: Minimum dimensions of 1-1/4-inch by 1-1/4-inch by the <br />minimum length shown on Drawings. <br />5. Steel Posts: Minimum weight of 0.90 pound per foot. <br />6. When sediment deposits reach approximately one-third the height of the <br />silt fence, remove and stabilize deposits. <br />3.02 ADDITIONAL REQUIREMENTS <br />A. Natural Buffer or Equivalent: <br />1. Unless natural buffer between the Project Site and receiving waters has <br />previously been eliminated by pre-existing development disturbances, <br />comply with one of the following alternatives if stormwater from <br />construction will discharge to surface water: <br />a. Provide a 100-foot, undisturbed natural buffer between <br />construction disturbances and surface water. <br />b. Provide an undisturbed natural buffer that is less than 50 feet <br />supplemented by additional erosion and sediment controls, which <br />in combination, achieve a sediment load reduction that is <br />equivalent to a 50-foot buffer. <br />c. If it is infeasible to provide an undisturbed natural buffer of any <br />size, implement erosion and sediment controls that achieve a <br />sediment load reduction that is equivalent to a 50-foot buffer.