PC-2023-06 - Laserfiche WebLink

neighboring properties unless a storm drain easement across the neighbor is obtained. Sump properties must be designed to discharge the 50-year recurrence interval storm event through the pipe network before habitable structures become inundated. (Address this condition prior to plan approval) 73. SANITARY SEWER DESIGN STANDARDS: Connections to the City’s sanitary sewer network shall conform to Pleasanton Municipal Code Title 15 “Sewerage”. All buildings inhabited by human beings which are not more than approximately 250 feet from the City’s sewer network shall be connected. All premises, parcels, and/or lots shall have independent connections to the City’s sewer network except under the following conditions: a. If a private on-site treatment system has been authorized by both the City and Alameda County Department of Environmental Health. b. If multiple premises are located on a single parcel or lot which cannot be subdivided and are all under one ownership. Public sanitary sewer system shall be designed to satisfy the following minimum standards: a. Minimum Manning Coefficient (n) within the pipe = approximately 0.013 b. Minimum flow velocity = approximately two feet per second at least once per day c. Maximum flow velocity = approximately 10 feet per second d. Maximum depth of flow to pipe diameter (d/D) = approximately 0.75 for dry weather flow conditions e. Minimum pipe sizes: Laterals = approximately four inches diameter; Main = approximately eight inches diameter; Force main = approximately six inches diameter f. Minimum slope per table: Approximate pipe size in diameter Minimum slope 4 inches 0.02 (lateral) 6 inches 0.005 (lateral) 8 inches 0.003 10 inches 0.0025 12 inches 0.0020 15 inches or larger 0.0015 g. Maximum manhole spacing = approximately 350 feet h. Minimum curvature for curved sewer mains: approximately 200 feet or not less than recommended by pipe manufacturer i. Minimum pipe cover = approximately five feet j. Peaking factor shall be Peak Wet Weather Flow divided by Average Dry Weather k. flow (PF = PWWF/ADWF). Referring to the City’s Wastewater Master Plan from August 2007, PF shall be the average of the three events shown on Table 4.5 “Inflow and Infiltration Analysis” for each subbasin. The Basin I.D. is from Figure ES-3. Minimum allowable PF = 2.0. l. Backflow prevention devices must be installed if the lowest plumbing fixture in the building is lower than the downstream cleanout overflow device or manhole to assure effluent discharge outside of the building in case the downstream pipe network becomes obstructed. m. Fats, Oils, and Grease (FOG) controls: Discharge of FOG to the City’s sanitary sewer system shall conform to Pleasanton Municipal Code Chapter 15.44. In addition to other controls, a sampling manhole must be provided immediately downstream of any grease interceptor in accordance with City Standard Drawing 402. (Address this condition prior to plan approval)