Permits & Development - Encroachment(EP)/Driveway(DW) Permits - 2007_EP-07-301 thru EP-07-400_ - EP-07-352

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Sediment filter bag fabric shall conform to the following requirements: Secification Grab tensile strength(25-mmons, Re uirements ASTM Desi anon: D 4632 ora)�rolriate tminimum.test method for s in eachcific direof cher 1.35 Elongation ,perceat minimum in each direction ASTM Designation: D 4632 or ro nate test method fors ecific polymer 1 Permittivity, 1/sec.,minimum. ASTM Desi ation: D 4491 1.5 Flow rate,liters per minute per square meter,minimum. ASTM Desi ation: D 4491 8140 Ultraviolet stability,percent tensile strength retained after 500 hours,minimum. ASTM Desi ation: D 4355 xenon-arc lam and waters ra weatherin method 80 The sediment filter bag shall be sized to fit the catch basin or drainage inlet and shall be complete with lifting loops and dump straps attached at the bottom to facilitate emptying of the sediment filter bag. The sediment filter bags shall have a restraint cord approximately halfway up the bag to keep the sides away from the catch basin walls. INSTALLATION Temporary drainage inlet protection shall be installed at drainage inlets in paved and unpaved areas as follows: A. Temporary drainage inlet protection shall be installed such that ponded runoff does not encroach on the traveled way or overtop the curb or dike. Gravel-filled bags shall be placed to control ponding and prevent runoff from overtopping the curb or dike. B. The bedding area for the temporary drainage inlet protection shall be cleared of obstructions including rocks,clods, and debris greater than 25 mm in diameter before installation. C. A temporary linear sediment barrier shall be installed up-slope of the existing drainage inlet and parallel with the curb,dike,or flow line to prevent sediment from entering the drainage inlet. Silt Fence Silt fence shall be installed along the perimeter of the erosion control blanket or geotextile fabric, with the posts facing the drainage inlet. The trench shall be backfilled and tamped to secure the silt fence fabric in the bottom of the trench. Sediment Filter Bags Sediment filter bags shall be installed by removing the drainage inlet grate,placing the sediment bag in the opening,and replacing the grate to secure the sediment filter bag in place. MAINTENANCE Temporary drainage inlet protection shall be maintained to provide sediment holding capacity and to reduce runoff velocities. Temporary drainage inlet protection shall be repaired or replaced immediately after the damage occurs. Sediment deposits, trash, and debris shall be removed from temporary directed by the Engineer. Removed sediment shall be deposited within the roject limits o that the sediment is otrotection as dsor ub'subject to erosion by wind or by water. Trash and debris shall be removed and disposed of in accordance with the provisions in Section 7-1.13, "Disposal of Material Outside the Hi �� p Highway Right of Way, of the Standard Specifications. At locations where rills and other evidence of concentrated runoff have occurred beneath the drainage inlet protection, the protection shall be adjusted to prevent another occurrence. Temporary silt fence shall be repaired or replaced when silt fence fabric becomes split, torn, or unraveled. Sagging slumping silt fence shall be repaired with additional stakes or replaced. Broken or split stakes shall be replaced. Temporary silt fence shall be maintained to provide a sediment holding capacity of approximately 1/3 the height of the silt fence or above ground. p rY Sediment filter bags shall be emptied when the restraint cords are no longer visible. Sediment filter bas shall brie emptied by placing 25 mm steel reinforcing bars through the lifting loops. The bag shall be emptied of its contents and rinsed before replacement in the drainage inlet. g be Contract No. 10-OM7104 147