1991-01-14 Regular Meeting - Laserfiche WebLink

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u • sewage for chemical content analysis. This anal}~sis shall be supplied to the Contractor for his information. The Contractor shall supply various types of cured resin coupons to the Authorized City Representative for the City's use in selection of the appropriate resin. d. Materials: The flexible felt fiber tube shall be fabricated to a size that when installed it will neatly fit the internal circumference of the conduit specified by the City. An allowance shall be made for some circumferential stretching during inversion. The minimum length shall be that deemed necessary by the Contractor to effectively span the distance from the inlet to the outlet of the respective manholes unless otherwise specified. The Contractor shall verify the lengths in the field before impregnation of the tube with resin. Individual inversion runs can be made over one or more manhole sections as determined in the field by the Contractor and approved by the Authorized City Representative. The outside of the tube, before installation, shall have an impermeable plastic coating. This coating will form the inner layer of the finished pipe and is required for enhancement of corrosion, flow, and abrasion properties. The layers which constitute the pipe wall must be such that when the thermosetting resin cures, the total wall thickness must be homogeneous with no internal layer of plastic which might weaken the pipe wall and allow internal shear. When cured the CIPP must form a mechanical bond with the conduit. Unless otherwise specified, the Contractor shall furnish a general purpose, unsaturated, polyester resin and catalyst system compatible with the inversion process that provides cured physical strengths specified herein. The materials used shall result in an installed CIPP flow capacity which will have equal to or greater than 100% of the original pipe's flow capacity when new. A bidder may propose alternate materials to perform the lining. This proposal must have a minimum of ten (10) days prior approval as an equal " rip 'or to" bid opening. This approval may only- come from the City's Authonzed Representative. The Contractor shall have on hand sufficient material to perform the work he is assigned within ten (10) days of Notice to Proceed. The existing sewers, where designated or required shall be lined using materials and workmanship which can be adapted to the restrictions of the work site. The Contractor shall not begin this phase of the work until there is sufficient materials on hand to complete the~ob. The Contractor shall furnish to the City's Authorized Representative, prior to use of the lining material, satisfactory certification from an approved testing laboratory as to the results of testing the proposed lining material.