4.4 SR 04-19-2021 - Laserfiche WebLink

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City of Elk River Design Standards Materials Pipe and fittings for non -pressure gravity sewers and services shall conform to the requirements of ASTM D 1784 and D 3034, or ASTM F 789 and D 3034, and have push -on joints with elastometric gaskets, as follows: A. SDR 35 for depths up to 18-ft. B. SDR 26 for depths 18-ft to 30-ft. C. Ductile Iron Pipe, as specified below, for depths greater than 30-ft. 2. Pipe and fittings for pressure forcemains shall conform to the requirements of ASTM D 1784 and the following supplementary provisions: A. For pipes 12" in diameter and smaller, the pipe, fittings and accessories shall be C900 and have a minimum dimension ratio (DR) of 18 corresponding to a working pressure of 150 psi. For pipes 14" in diameter and larger, the pipe, fittings and accessories shall be C905 and have a minimum dimension ratio (DR) of 25 corresponding to a working pressure of 165 psi. B. Joints shall be push -on type with elastometric gaskets. C. Forcemain pipe shall have location tracer wire placed with it. Location wire shall be 8- gauge plastic jacket type TW or THW. Splices shall be made using 3M cast kits and shall not occur more frequently than one per 250 feet of pipe. All ductile iron pipe shall conform to the requirements of AWWA C 151 (ANSI A21.51) and as follows: A. CL 52 for depths 30-ft to 60-ft. B. CL 54 for depths greater than 60-ft. 4. For service pipe placed at a depth of 30 feet or greater, the pipe material shall match the mainline pipe as called for in item B3 above. Service pipe placed shallower than 30 feet of depth shall be SDR 26. Lift Station 1. Site A. Drainage: the top slab of the wet well and valve vault should be set high enough to allow drainage away from the lift station structure. B. Access: an access driveway that is 12' wide x 20' long shall be provided for the lift station. C. A hydrant should be located within 50 feet of the lift station. D. A streetlight should be installed at each lift station. 2. General Configuration — the plan must indicate the proposed location of the Control Panel which is subject to approval by the Wastewater Superintendent and City Engineer. 3. Structures A. Minimum Size — 72" is to be a minimum diameter for both the wet well and valve vault. Depending on the size of the pumps, the wet well may need to be larger. B. The bottom of the valve vault is to be provided with 4" of slope across the vault to the drain outlet. The drain line should exit the valve vault horizontally through the wall instead of vertically through the floor. A backflow check valve needs to be installed on the drain line to prevent backflow of water and gas from the wet well to the valve vault. A trap should also be located in the drain line as a back up to the check valve for preventing gas flow back into the vault. C. All pipe work and fittings shall be contained within the valve manhole. Short -radius 90- © City of Elk River, Minnesota —All rights reserved 20