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Figure II-3.30: Sediment Pond Riser Detail <br /> Provide adequate <br /> Polyethylene cap strapping <br /> Perforated --- Corrugated <br /> Corrugated <br /> polyethylene drainage metal riser <br /> tubing,diameter min. -_- <br /> 2"larger than -___- <br /> dewatering orifice. 3.5'min. <br /> Tubing shall comply Watertight I Dewatering orifice, <br /> with ASTM F667 and __--_ coupling schedule 40 steel <br /> AASHTO M294. --- Tack weld stub min.diameter <br /> per calculations <br /> 1 Jill <br /> i <br /> i 6"min. r------- <br /> i <br /> 18"min. <br /> Concrete base <br /> Alternatively, metal <br /> stakes and wire may be <br /> 2X riser dia.min. used to prevent flotation <br /> NOT TO SCALE <br /> Sediment Pond Riser Detail <br /> Revised June 2016 <br /> DEPARTMENT OF <br /> ECOLOGY Please see http://www.ecy.wa.gov/copyrighthtml for copyright notice including permissions, <br /> State of Washington limitation of liability,and disclaimer. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume 11-Chapter 3-Page 394 <br />