Laserfiche WebLink
SECTION 02533 <br /> TESTING OF GRAVITY SEWER SYSTEM <br /> 1 .01 GENERAL <br /> The Contractor shall perform testing of all sanitary gravity sewers as set forth in this section and <br /> shall conduct the tests in the presence of a authorized County representative and the project <br /> Engineer. The Contractor shall schedule the tests with the County at least five days in advance. <br /> 1 . 02 LAMPING <br /> Lamping shall be conducted as installation of the line progresses. The installed sewers shall be <br /> visually inspected by "lamping" between each manhole, lamphole, or other structures in order to <br /> ascertain that they are clear, to correct alignment and have no visual bellies. The concentricity of the <br /> lamp image received shall be such that the diameter of said image shall have no vertical or horizontal <br /> reduction from that of the pipe inside diameter. <br /> 1 . 03 PRE — T.V. DEFLECTION TESTING <br /> Deflection testing shall be performed on all flexible pipe (thin wall PVC, HDPE, etc.) after the final <br /> backfill has been in place a minimum of 30 days. A rigid ball or mandrel shall be used which shall <br /> have a diameter at least 95 percent of the base inside diameter or average inside diameter of the pipe, <br /> depending on the specified ASTM pipe specification. The test shall be performed without <br /> mechanical pulling devices. No pipe shall exceed a deflection of 5 percent. If deflection exceeds 5 <br /> percent, the pipe shall be replaced or corrected in accordance requirements in the approved <br /> specifications. <br /> 1 .04 T.V. INSPECTION <br /> Upon completion of deflection testing, gravity sewer mainline between manholes will be inspected <br /> by the Contractor, using a television camera. TV inspection will be done at a point in time that the <br /> area of pipe construction has been compacted and road material compacted to support heavy trucks . <br /> Service laterals shall be thoroughly flushed. Mainlines shall then be jet cleaned prior to inspection. <br /> Any sand or dirt found in the sewers shall be removed by the Contractor. All leaking joints or <br /> fittings shall be replaced, encased with concrete or sealed from the inside with grout as determined <br /> by the Engineer and Owner. All cracked or defective pipe shall be replaced by the Contractor. <br /> Bellies in the pipe or at the joints which retain more liquid that allowable shall be replaced. TV re- <br /> inspection as required by the Engineer or the Owner will be at Contractor's expense. <br /> 1 .05 INFILTRATION/EXFILTRATION TESTING <br /> All sewer mains, house laterals and manholes shall be subjected to infiltration and/or exfiltration <br /> tests. In general, infiltration testing shall be performed on sewers lying below the ground water table <br /> and exfiltration testing shall be performed on sewers lying above the groundwater table. (The Owner <br /> and project Engineer shall agree which type of test shall be utilized for each section of pipe being <br /> tested. <br /> A . Infiltration Test: Infiltration testing shall be conducted in a dry system prior to the system <br /> being filled with water. Testing shall proceed for a continuous period of four hours with <br /> infiltration amounts measured by a weir or other approved method by the City. In no case <br /> 02533 — Testing Gravity Sewer System <br /> 02533- 1 <br />