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<br />r. I, ~. <br /> <br />Sed i me'r'n'e <br /> <br /> <br />ntrol <br />rotectton <br /> <br />Geotextile shall be a woven, nonwoven, or knit fabric of polymeric filaments or yams such as polypropylene, <br />polyethylene, polyester, or polyamide formed into a stable network such that the filaments!yams retain their <br />relative position to each other. <br /> <br />Tbe geotextile shall be inert to commonly encountered chemicals and shall be free of any chemical treatment <br />or coating that might significantly reduce porosity or permeability. <br /> <br />. Geotextile shall be uniform in texture, thickness and appearance, and be free of defects, flaws or tears that <br />would significantly alter its strength or filtering properties. <br /> <br />. All authorized repairs shall be completed to the satisfaction of the Engineer. <br /> <br />The geotextile shall meet or exceed the following: <br /> <br />. Grab Tensile Strength ASTM D 4632 100 pounds <br /> <br />Seam Breaking Strength ASTM d 4632 90 pounds <br /> <br />Apparent Opening Size (AOS) 40-120 (U.S. Std. sieve size) <br /> <br />Mulch <br /> <br />Mulch shall be MNDOT Type 9 for use as aggregate filters. <br /> <br />. Aggregate mulch will be 3/8- to 2-inch, with 5 percent by mass allowable passing the 3/8-inch sieve. Crushing <br />is allowable, but not required. <br /> <br />Other <br />. All other materials shall be as specified on the following details. <br /> <br />Sequencing <br /> <br />. Inlet protection should be placed immediately after the storm sewer inlets are installed. <br /> <br />. Inlet protection may need to be removed during certain phases of construction. As soon as practical, inlet <br />protection should be replaced. <br /> <br />. The result that blocking storm drain inlets will have on the site's drainage must be considered. Long sloping <br />streets or ditches designed with several inlets along their length may have a significant amount of surface flow <br />accumulate if inlet protection is used. <br /> <br />. In low areas, a pond will form around inlets. Ponding is necessary for removing sediment from runoff and <br />should be encouraged in conjunction with inlet protection. <br /> <br />. Erosion-control practices should be used upstream to limit sediment movement from disturbed areas to the <br />inlets <br /> <br />The inlet protection should be left in place until the drainage area is stabilized with established vegetation or <br />pavement. <br /> <br />Metropolitan Council I Barr Engineering Co. <br /> <br />3-115 <br />