of the special stilling basin. Place t he special stilling basin(s) so the incoming runoff or pumped effluent flows into and through it without causing erosion to adjacent slopes or streambanks. In areas of turbidity and water quality concern, place the special stilling basin(s) up grade and direct its runoff into a sediment control measure before being allowed to discharge into jurisdictional waters. Replace and dispose of t he special stilling basin(s) when it is 3/4 full of sediment or when it is impractical for the bag to filter the sediment out at a reasonable flow rate. Prior approval from the Engineer shall be received before removal and replacement. Provide a sufficient quantity of bags to contain silt from pum ped effluent during construction of drilled piers, footing excavation and culvert construction. A sufficient quantity of special stilling basins shall be provided to contain sediment from temporary slope drain runoff. 1639 -4 MEASUREMENT AND PAYMENT Special Stilling Basin will be measured and paid as the actual number of bags used during temporary slope drain installation, drilled pier construction, footing excavation or culvert construction as specified and accepted. Geotextile for Drainage will be measured and paid in accordance with Article 876 -4. Sediment Control Stone will be measured and paid in accordance with Article 1610- 4. Such price and payment will be full compensation for all work covered by this section, including but not limited to, furnishing all materials, placing and maintaining the special stilling basin(s) and removal and disposal of silt accumulations and bag. Payment will be made under: Pay Item Pay Unit Special Stilling Basins Each COIR FIBER BAFFLE -1 DESCRIPTION Furnish material, install and maintain coir fiber baffles according to the details in the plans or in locations as directed by the Engineer . Install c oir fiber baffles in silt basins and sediment dams at drainage outlets. Work includes providing all materials, placing, securing, excavating and backfilling of coir fiber baffles. -2 MATERIA LS
Provide matting to meet Article 1060 -14
Provide staples made of 0.125 inch diameter new steel wire formed into a U -shape not less than 6 inches in length with a throat of 1 inch in width.
Provides teel posts at least 5 f eet in length, approximately 1 3/8 inches wide measured parallel to the baffle and have a minimum weight of 1.25 lb s. per foot of length. Equip the post with an anchor plate having a minimum area of 14.0 square inches and of the self-fastener angle steel type to have a means of retaining wire and coir fiber mat in the desired position without displacement.
Provide 9- gauge high tension wire strand of variable lengths.