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Polyethylene cap <br />Provide adequate <br />strapping <br />Perforated polyethylene <br />Corrugated <br />drainage tubing, diameter <br />- <br />metal riser <br />min. 2" larger than <br />dewatering orifice. <br />3.5" min. <br />Tubing shall comply <br />with ASTM F667 and <br />: Watertight <br />Dewaterin orifice, schedule, <br />g <br />AASHTO M294 <br />coupling Tack weld <br />- <br />40 steel stub min. <br />- <br />Diameter as per calculations <br />�rrrnn <br />r 6" min. r--- <br />18" min. i <br />Alternatively, metal stakes <br />Concrete base <br />and wire may be used to <br />L <br />prevent flotation <br />�-- 2X riser dia. Min. -- <br />Figure 4.2.20 — Sediment Pond Riser Detail <br />Volume II — Construction Stormwater Pollution Prevention - August 2012 <br />4-107 <br />• <br />I� <br />r� <br />