Laserfiche WebLink
13. Trunk sanitary sewers shall be designed to promote a laminar flow through the sewer <br />system. Junction manholes should be designed to limit the hydraulic head increase by <br />matching hydraulic flow lines and by providing smooth transition angles. <br />14. No manhole shall be located within a designed ponding/flowage easement without <br />City approval. If such location is unavoidable, then the structure may be required to <br />be built to a higher elevation to avoid flooding, constructed to tolerate frost action, <br />and shall be made of water -tight materials. <br />15. The following pipe types and class are identified in general with respect to depths <br />with soil type verification and design criteria required to substantiate size and type of <br />pipe used: <br />SIZE <br />DEPTH <br />TYPE & CLASS <br />8" <br />TO 10" <br />8' TO 16' <br />PVC, SDR 35 <br />8" <br />TO 10" <br />16' TO 26' <br />PVC, SDR 26 <br />8" <br />TO 10" <br />26' TO 40' <br />DIP, CLASS 52 <br />8" <br />TO 10" <br />Over 40' <br />DIP, CLASS 53 <br />16. Deflection testing for all non -rigid PVC pipe shall be conducted after the final <br />backfill has been in place for 30 days. <br />C. WATERMAIN <br />1. All fittings, valves, and hydrants shall be secured utilizing Cor -Blue bolts. <br />2. All fittings and Ductile Iron Pipe (DIP) should be encased with a polyethylene <br />film conforming to AWWA C105/A21.5 and ASTM A674, tube form and color <br />black. <br />3. The film marking is required to conform to AWWA C105/A21.5 and ASTM <br />A674, including AWWA/ASTM standard, corrosion protection warning and <br />applicable range of nominal pipe diameter size(s) every 2 feet along its length. <br />4. Polyvinyl Chloride Pipe shall conform to AWWA C900 for pipe sizes 4 to 12 <br />inches and AWWA C905 for pipe sizes 14 to 24 inches. All pipes shall have a <br />minimum dimension ratio (DR) of 18 corresponding to a working pressure of 235 <br />psi for PVC type 1120 pipe <br />5. Ductile Iron Pipe shall be cement lined class 52, ductile iron with mechanical or <br />push -on joints and shall conform to the requirements of ASA A-25.51 <br />6. High Density Polyethylene Pipe shall be extra high molecular weight, high <br />density polyethylene (EHMW-HDPE, PE3408) conforming with the minimum <br />structural standards of ASTM D3350 with cell classification 345434C as <br />manufactured by Chevron Phillips Chemical Company 4000/4100 Series, or <br />equal. All HDPE pipe material shall meet the requirements of ASTM D1248 for <br />a Type III, Class C, Category 5, Grade P34. <br />