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(A) All wastewater sewers shall be tested for leakage using the infiltration test if the watertable is 24 inches or higher above the crown of the pipe, and the exfiltration by water test will be used if the water table is less than 24 inches above the crown of the pipe. If authorized by the developer’s engineer, pressure air testing of the sewers may be used only if conditions do not permit testing by infiltration or exfiltration by water. PVC sewer pipe shall also be tested for deflection.
(B) All sewers shall be lamped, and shall shown at least three-fourths of the cross-sectional area of the pipe between adjacent manholes. All sewers not passing the lamping test shall be considered unsatisfactory and shall be repaired by the subdivider.
(C) Any sewer not passing the tests required in divisions (A) and (B) above shall be deemed unacceptable and shall be properly repaired by the subdivider and retested until such time as the sewer passes these required tests.
(D) The maximum section to be tested shall be between adjacent manholes. The developer’s engineer shall determine what the testing section lengths shall be. The subdivider will be advised of the results of all tests performed as a guide to her or his operation.
(E) The subdivider shall flush all sewers with water sufficient in volume to obtain free flow through each line. Flushing water and debris shall not enter any pump station wet well. Water will be pumped from the sewer system during flushing to a discharge location authorized by the developer’s engineer. A visual inspection shall be made and all obstructions removed and defects corrected. The subdivider shall cooperate with the Village Engineer in the performance of leakage and exfiltration tests on all sections of sewer after backfilling. The subdivider shall supply all materials, equipment, and labor necessary to complete the testing requirements. The subdivider is also responsible for the disposal of flow from the pipe, or trench upstream from the pipe, or trench upstream from the section being tested, for a period of not more than eight hours for each test performed. Tests will be performed in such manner and at such times as to cause the least possible hindrance to the progress of work.
(F) (1) Infiltration method. The section of sewer to be tested shall have been backfilled and a check made to insure the water level in the trench is a minimum of 24 inches over the crown of the sewer pipe. Infiltration flow shall be measured by a 90- degree V-notch weir with free fall discharge or other means acceptable to the Village Engineer. Infiltration leakage shall not exceed 200 gallons per inch of pipe diameter per mile per day of sewer pipe, including manholes in the test section.
(2) Exfiltration method. The section of sewer to be tested shall be sealed by inserting inflatable rubber bags in the pipes or by other means, and then water shall be introduced into a manhole until the section is completely filled. The subdivider shall fill the pipe to the test level eight hours prior to the time of exfiltration testing to permit normal absorption into the pipe walls. Throughout the test period of at least one hour, the water level in the upper manhole shall be maintained at least 24 inches above the crown at the upper end of the pipe or at least 24 inches above the groundwater table, whichever is higher. The length of pipe tested shall be limited so that the pressure on the centerline of the lower end of the section tested shall not exceed six feet of water column. Exfiltration leakage shall not exceed 240 gallons per inch of pipe diameter per mile per day of sewer pipe, including manholes in the test section.
(3) Air testing. Air testing shall be done in accordance with ASTM Standard C-828, Recommended Practice for Low-Pressure Air Test of Vitrified Clay Pipe Sewer Lines (four to 12 inches).
(4) Deflection testing. Following their construction, all PVC wastewater sewers shall be tested for deflection per the requirements of §§ 31-1.1 IB (4) and 31.11C (4) of the State Standard Specifications for Water and Sewer Main Construction.
(G) Prior to putting any service connection from a house or other user to a mainline sewer into use, the subdivider’s engineer shall file a certificate with the village stating that the required improvements were constructed in accordance with the approved engineering drawings and specifications. Such certificate shall include the following:
(1) The elevation of the groundwater line and the elevations of the upper and lower pipe inverts for each portion tested;
(2) The infiltration, exfiltration, or one pound air pressure drop rates of each portion tested and the allowable rates based upon the test method utilized;
(3) A statement that all reaches between manholes have passed the required leakage tests;
(4) A statement that all reaches between manholes have passed all deflection tests and a compilation of deflection test results (if applicable);
(5) A statement that all reaches between manholes have passed all lamping tests and that all reaches are clean and straight and free of all obstructions or debris; and
(6) A statement that all reaches between manholes have been constructed to within 5% of the design gradient.
(Ord. 97-7, passed 7-1-1997, § 5.18)