Resolutions-1997-021

C. All gravity mains shall be a minimum of 8 inches in diameter. The developer shall provide for and install up to 15 inch diameter main where warranted by the City Engineer, within or outside the subdivision. If a main greater than 15 inches in diameter is required, the City shall reimburse the developer for the difference in the cost of materials only. D. Pipes will be sized to carry peak rates with the pipe flowing at no more than 0.67 of the pipe diameter for pipes 15 inches and smaller and 0.75 of the pipe diameter for pipes larger than 15 inches in diameter. E. All sewers shall have a slope which will give a mean velocity when flowing full of not less than 2.0 feet per second based on Manning's formula using and "n" value of 0.013. F. Where velocities greater than 15 feet per second are calculated, special provisions shall be made to protect against displacement, erosion or shock. G. Sanitary sewers shall be sufficiently deep so as to receive sewage by gravity from basements and to prevent freezing. 8.05 SERVICE CONNECTIONS A. All sanitary sewer services shall be in accordance with Table 8.2. B. A sanitary service pipe will be provided for every platted lot or location where construction of a building is likely. A 4 inch sanitary service pipe will be used for single-family residential. Pipes for multi-family residential, commercial, or industrial, will be sized as required. C. Sanitary service pipes will be extended from the main to the right-of-way line or outer utility easement line, whichever is further. D. No two sanitary services shall be constructed in the same trench. Service connections shall be separated by a minimum of 6 feet. E. The end of all sanitary services shall be marked with a metal post, #4 reinforcing steel, or painted wood 4" x 4" at least 24 inch in length buried within one foot of the finished grade. F. Service taps in manholes are allowed only in extreme conditions and with the approval of the City Engineer. If permitted, service connections to manholes must be between 6 inches and 12 inches above the invert elevation of the outlet. Service tap chocks in the manhole bottom must be provided for all services. Internal drops for service connections may be permitted on manholes deeper than 12 feet upon approval of the City Engineer. Internal drops shall be constructed of SDR 23.5 PVC with stainless steel bands and fasteners spaced at a maximum of 4 feet. 8.06 PIPE STANDARDS AND STRENGTH DESIGN A. Reinforced concrete pipe manufactured in accordance with ASTM C-76 and meeting the following standards may be used for pipe 12 inches in diameter or larger.