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Polyethylene cap Provide adequate <br /> strapping <br /> Perforated polyethylene Corrugated <br /> drainage tubing,diameter - rug <br /> min.2"larger than - metal riser <br /> dowaiering orifice. = <br /> Tubing shall comply 3.5"min. <br /> YAM ASTM F667 and = Watertight Dewateringorifice,schedule, <br /> AASHTO M294 = coupling Tack weld 40 steel stub min. <br /> Dam eter as per c alcutations <br /> �l�IE111 <br /> 1 6"min. r--- <br /> L--- ---J <br /> 16"tnnln. Attemattvoly.metal stakes <br /> 1 Concrete base and wire may be used to <br /> .I_ prevent flotation <br /> 2X riser dla.Min. - <br /> Figure 4.2.20—Sediment Pond Riser Detail <br /> Vohuue 11—Construction Siornnvaler Polhilion Prevention -Aargusi 2012 <br /> 4-107 <br />