Award Bid - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer, LLC

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poor sample. Sampling and Sample Size -- The following is a summary of recommended sampling procedures. There are basically two accepted methods of obtaining samples from installed CIPP: • A plate molded sample of resin and felt from the installed tube, and • A restrained piece of CIPP cut from the liner itself. In addition to proper sampling, it is critical to obtain enough CIPP to perform the flexural property testing that is typically performed to evaluate the minimum physical requirements. For either type of sampling procedure, the required sample sizes should be in the following range in order to have enough material to evaluate according to ASTM D790. • For 4.5 - 13.5 mm thick CIPP, the sample should be 6 inches wide and 10 inches long. • For 15 - 21 mm thick CIPP, the sample should be 8 inches wide by 15 inches long. • For 22.5 - 28.5 mm thick CIPP, the sample should be 10 inches wide by 24 inches long. FINISHING STEPS • Cutting Ends -- After the liner has been cured and cooled down, cut a window in the cured liner in the downstream manhole. Visually inspect the interior of the liner. If the liner appears unacceptable (soft, fins, etc.), contact the supervisor before proceeding. If the liner is acceptable, each end should be cut approximately 4 inches beyond the pipe face. Allow this outer portion of the liner to protrude into the manhole or pipe access because it helps lock the liner into the pipe face and provides an area for facing the pipe with the specified thermosetting or cementitious grouting material. • Removing Rope and Lay Flat - Once the layflat has been cut from the liner in the downstream manhole, pull the hold back rope and discharge out of the liner through the upstream manhole. • Cutting Laterals -- Enter the pipe with camera and cutting equipment and reinstate the service laterals. • Facing Ends -- Face the ends of the pipe with the specified thermosetting or cementitious grouting material. For optimal resistance to hydrogen sulfide related corrosion, it is recommended to use a polymer-based grout or polymer coating designed for such purposes. • Final Underground CCTV Inspection & Review -- After the laterals have been opened and the ends of the pipe coated or sealed, perform the final CCTV inspection through the entire length of the CIPP. It is recommended that all of the aforementioned finishing steps should be accomplished prior to taking down any by-passed sewerage plugging and pumping. The final inspection should show the full diameter of the CIPP throughout the length of the pipe being inspected.