1. The City has mapped and identified the sanitary sewer manholes to be lined. Manhole depths, sizes, and constructed materials are identified on Attachment 1. This sheet identifies which manholes are to receive the various coatings. 2. The various coatings are the following: a. Cementitious liner shall have a minimum thickness of .75 inches. b. Solid Epoxy Coating shall have a minimum thickness of 0.1 inches. c. Flexible Joint Chimney Seal shall be a cured in place seal with a minimum thickness of .25 inches 3. Pre-Cleaning – The Contractor shall clean the manholes to be lined thoroughly before commencement of the lining process. Surface preparation shall be done with Low Pressure Water Cleaning (4,000 psi min) and/ or hand or tool cleaning. All unsound concrete, contaminants, dirt, debris, deteriorated reinforcing steel, deteriorated steps, root masses, mineral or other attached deposits, or any other matter not herein defined, shall be removed from the manhole at this time. 4. Cementitious Manhole Lining – A Cementitious liner with a minimum of .75 in thickness shall be used. The Cementitious liner shall be able to withstand corrosive environments with a PH of 3 or higher. The intent of the Cementitious lining process is to rehabilitate the manhole. The Contractor shall provide a cementitious restoration material designed for structural build-back, I&I abatement, corrosion resistance, and repairing inverts. All materials applied to a structure shall be compatible, as specified by the manufacturer. All materials used shall meet the attached NASSCO Specifications attached to this document. 5. Solid Epoxy Coatings- a Solid Epoxy Coating with a minimum of 100 mil thickness shall be applied over the Cementitious coating. The Contractor shall provide a solid epoxy coating designed to improve the chemical and temperature resistance of the structure.
