The pipe-bursting equipment may be either hydraulic, pneumatic or the cone cracking type. The bursting head shall be designed to force its way through the existing pipe materials by fragmenting the pipe and compressing the old pipe section into the surrounding soil as it progresses. The head shall be designed to produce a maximum opening dimension of one inch (diameter) larger than the outside diameter of the new HOPE pipe. The pipe-bursting system shall be used to replace the existing private sewer with the same nominal size pipe. The system shall not be used to increase the size of the private sewer.
(B) Utilities. At least 48 hours prior to excavation, the contractor shall call Underground Services Alert (USA) at 811. The contractor shall request utility markings for the entire reach of the proposed pipe burst. The contractor shall pothole all utilities crossing the proposed pipe burst to determine the clear distance between each utility and the existing private sewer. Utilities with less than 12 inches of clearance or water mains and services with less than 24 inches of clearance shall be left exposed during the pipe-bursting installation.
(C) Installation. After coordinating with the property owner and residents, the contractor shall plug the existing private sewer or provide by-pass pumping system to prevent sewage spills. Dumping or free flow of sewage within the excavation or on public or private property, gutters, streets and storm drain facilities is prohibited.
(1) The insertion pit shall be large enough so that HOPE pipe can be installed without exceeding the minimum bending radius. The minimum bending radius shall be 20 times the outside diameter of the pipe or as recommended by the pipe manufacturer, whichever value is larger.
(2) After installation, the contractor shall allow a minimum of four hours for relaxation due to tensile stressing and to allow the pipe to thermally acclimate with the soil prior to installing final connections to main sewer or private sewer. Temporary connections can be installed sooner to reinstate sewage flows.
(3) Any installed pipe which has cuts or abrasions in the pipe wall exceeding 10% of the wall thickness shall be cut out and removed from the site.
(4) After final cleaning of the private sewer, water shall be introduced into the new pipe section and the post-rehabilitation television inspection shall be completed. The video shall be submitted to the District for approval.
(D) Connections. A cleanout to grade, including box and cover, shall be installed at or near the property line as shown on the standard plans. Connections shall be completed using Gripper Gasket Max Adapter coupling.
(Ord. 2019-02, passed 4-25-2019)