4.4 SR 02-21-2023 - Laserfiche WebLink

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City of Elk River Design Standards and shall be tested for e�cessi�re leakage upon completion and before connections are made to the service by Others. Each test section of the sewer shall be subjected to e�filtration testing b� the ASTM F1417 (low pressure air) test method regardless of pipe material. The requirements set forth for ma�mum leakage shall be met as a condition for acceptance of the sewer section represented by the test. All testing shall be performed by- the Contractor without any direct compensation being made therefore, and the Contractor shall furnish all necessary equipment and materials, including plugs and standpipes as required. The sewer pipe section under test shall be clean at the time of testing but the pipe may be wetted. Pneumatic balls shall be used to plug the pipe ends at manholes. Low pressure air shall be introduced to the plugged line until the internal air pressure reaches three and one half (3.5) psi greater than the average back pressure of any ground water pressure that may submerge the pipe. At least two (2) minutes shall be allowed for the air temperature to stabilize before readings are taken and the timing started. During this time the Contractor shall check all plugs to detect plug leakage. If plugs are found to leak, air shall be bled off, the plugs shall be re�ightened, and the air shall be rein�soduced into the line. The formula below calculates the specified minimum time required for a 1.00 psig pressure drop from a starting pressure of 3.5 psig to a final pressure of 2.5 psig using a leakage rate of 0.0015 cubic feet/minute/square foot of internal surface. Calculate all test times by the following formula: T= 0.085 DK/Q where: T= shortest time allowed for the air pressure to drop 1.0 psig, sec. K= 0.000419 DL but not less than 1.0, Q =1eak rate = 0.0015 CFM/SF, D= measured average inside diameter of sewer pipe, in., and L= length of test section, ft. 2. Mandrel Deflection Test Deflection tests shall be performed on all plastic gravit�� sewer pipes. The test shall be conducted after the sewer trench has been backfilled to the desired finished grade and has been in place for thi�ty (30) days. The deflection test shall be performed by pulling a rigid ball or nine-point mandrel (MnDOT Technical blemorandum 98-24-B-01 or latest revision) through the pipe without the aid of mechanical pulling devices. The ball or mandrel shall have a minimum diameter equal to ninety five percent (95%) of the actual inside diameter of the pipe. The ma�mum allowable deflection shall not exceed five percent (5%) of the pipe's internal diameter. The line will be considered acceptable if the mandrel can progress through the line without binding. The time of the test, method of testing, and the equipment to be used for the test shall be subject to the approval of the Engineer. All testing shall be performed b� the Contractor at his expense without any direct compensation being made therefore, and he shall furnish all necessary equipment and materials required. 3. Televisin� Sewer line televising is required, at the cost of the ContYactor, for all newly constructed lines. The full �rideo reports shall be submitted to the cit�� via USB flash drive. OO City of Elk River, Minnesota — All rights reserved 24