(a) Testing of the building sewer shall be under the supervision of the City Engineer's Department. Testing shall be by exfiltration and shall not exceed 200 gallons per inch diameter per mile of pipe per 24 hours.
(b) The contractor shall be required to conduct a test to determine the watertightness of the sewer when completed. The inlet end of the upstream and downstream cleanouts shall be closed with a watertight bulkhead, and the sewer along with the upstream cleanout shall be filled with water until the elevation of the water in the upstream cleanout is two feet higher than the top of the pipe, or two feet above the existing ground water in the trench, whichever is the higher elevation. The exfiltration will be determined by measuring the amount of water required to maintain the above stated water elevation for period of one hour from the start of the test. To reduce the amount of absorption the entire length of section to be tested may be filled and maintained full of water for a period of approximately twenty-four hours prior to the start of the test.
(c) The allowable leakage is based on a maximum difference in elevation of eight feet between the level of water at the upper cleanout and the invert of the pipe being tested in the lower cleanout. If the difference in elevation exceeds eight feet, the allowable leakage shall be increased five percent (5%) for each one foot in excess of eight feet.
(d) Immediately after the completion of the exfiltration test, the line shall be drained and the infiltration, under existing ground conditions, shall be measured within three hours by means of a weir located in the downstream manhole.
(e) It is further understood that, if the leakage does not come within the limits specified, the contractor will be required to do such work as may be necessary in order to insure conformance even to the extent of reconstruction of the defective section or sections.
(Ord. 9-2008. Passed 3-3-08.)