Specifications include, but are not limited to: A. When sewer flow depth is greater than 25 percent, flow depth shall be decreased by plugging or bypass pumping. Bypass pumping submittals shall be in accordance with Section 02542, Sewer Flow Control. B. Designated sanitary sewers and manholes shall be cleaned with the specified cleaning equipment herein. The cleaning process shall remove all dirt, grease, roots, grit, sand, silt, solids, rags, debris, etc. from each sewer segment, including the manhole(s). C. Precautions shall be taken to protect the sanitary sewer mains and manholes from damage that might be inflicted by the use of the cleaning process or equipment. Any damage to a sewer caused by improper or careless use of cleaning equipment by CONTRACTOR shall be repaired by the CONTRACTOR at no additional cost to OWNER and to the satisfaction of OWNER. D. Cleaning shall also include the initial manhole wall washing by high-pressure water jet. E. When hydraulic or high velocity cleaning equipment is used, a suitable sand trap, weir, dam, or suction shall be constructed in the downstream manhole in such a manner that all the solids and debris are trapped for removal. A. Locate existing manholes not visible at the surface using metal detectors or other means of detection. B. Dewater sufficiently to maintain the ground water level at or below the bottom of the manhole foundation prior to and during placement of the foundation. C. Obtain an adequate foundation for all manhole structures by removing and replacing unsuitable material with well-graded granular material, by tightening with coarse rock, or by such other means as provided for foundation preparation of the connected sewers or as directed by the OWNER. D. Unless otherwise noted on the project drawings, a minimum drop of 0.1 foot shall be provided across new manholes. E. Mortar joints of manholes to be lined with a spray liner 1. Thoroughly wet joint with water prior to placing mortar. 2. Place mortar on groove of lower section prior to section installation. 3. Fill joint completely with mortar of proper consistency. 4. Trowel interior and exterior surfaces smooth on standard tongue-andgroove joint. 5. Prevent mortar from drying out and cure by applying approved curing compound or comparable approved method. 6. Do not use mortar mixed for longer than 30 minutes. 7. Chip out and replace cracked or defective mortar. 8. Completed Manhole: Rigid and watertight