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7 <br />P�l <br />H� <br />N��l <br />L17111' <br />Frl <br />N <br />fl <br />�l <br />SUBARTICLE 104 -6.4.9 (Page 127). The text is deleted and the following <br />substituted: <br />Provide bales having minimum dimensions of 14 by 18 by 36 inches <br />[350 by 450 by 900 mm] at the time of placement. Construct Baled Hay or Straw dams <br />according to details shown in the plans, as directed by the Project Engineer or as shown in <br />the Design Standards to protect against downstream accumulations of sediment. <br />Use natural baled hay or straw meeting the requirements of Section 981 -3 or <br />synthetic hay bales may be used as an alternative to natural baled hay or straw. Synthetic <br />hay bales should be interlocking, have pre -made stake holes, are made of synthetic fibers <br />(polypropylene, nylon, polyester) that meet the Environmental Protection Agency's TCLP <br />standards, and produced into a filter medium with needle - punched fibers. Use synthetic <br />hay bales listed on the QPL. Wash out and remove sediment deposits when the deposits <br />reach 1/2 the height of the reusable synthetic hay bale or as directed by the Engineer. <br />Dispose of the washout in accordance with Section 104 -3 or in an area approved by the <br />Engineer. Synthetic hay bales that have had sediment deposits removed may be reinstalled <br />on the project as approved by the Engineer. <br />ARTICLE 104 -6 (Pages 125 -128) is expanded by the addition of the following new <br />Subarticle: <br />104 - 6.4.13 Artificial Coverings: <br />General: Install artificial coverings in locations where temporary protection <br />from erosion is needed. Two situations occur that require artificial coverings. The two <br />situations have differing material requirements, which are described below. <br />(1) Use artificial coverings composed of natural or synthetic fiber <br />mats, plastic sheeting, or netting as protection against erosion, when directed by the <br />Engineer, during temporary pauses in construction caused by inclement weather or other <br />circumstances. Remove the material when construction resumes. <br />(2) Use artificial coverings as erosion control blankets, at locations <br />shown in the plans, to facilitate plant growth while permanent grassing is being <br />established. For the purpose described, use non - toxic, biodegradable, natural or synthetic <br />woven fiber mats. Install in accordance with 571 -3 as for plastic erosion mat. Install <br />erosion control blankets capable of sustaining a maximum design velocity of 6.5 ft /sec <br />[2 m /sec] as determined from tests performed by Utah State University, Texas <br />Transportation Institute or an independent testing laboratory approved by the Department. <br />Furnish to the Engineer, two certified copies of manufacturers test reports showing that <br />the erosion control blankets meet the requirements of this Specification. Certification must <br />be attested, by a person having legal authority to bind the manufacturing company. Also, <br />furnish two 4 by 8 inch [100 by 200 mm] samples for product identification. The <br />manufacturers test records shall be made available to the Department upon request. Leave <br />the material in place, as installed, to biodegrade. <br />SUBARTICLE 104 -7.1 (Page 128) is deleted and the following substituted: <br />104 -7.1 General: Provide routine maintenance of permanent and temporary erosion <br />control features, at no expense to the Department, until the project is complete and <br />accepted. If reconstruction of such erosion control features is necessary due to the <br />March 2007 01000 -20 03-4122.D <br />