ORD 2284 - Laserfiche WebLink

Ordinance No. 2284 Page 29 of 40 10 inches 0.0025 12 inches 0.0020 15 inches or larger 0.0015 g. Maximum manhole spacing = 350 feet h. Minimum curvature for curved sewer mains: 200 feet or not less than recommended by pipe manufacturer i. Minimum pipe cover = 5 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. I. Backflow prevention devices must be installed if the lowest plumbing fixture if 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 subdivision plan approval) 79. POTABLE WATER SYSTEM DESIGN STANDARDS: All permanent connections to the City's potable water network shall conform to Pleasanton Municipal Code §14.04.050. Any required water pressure and/or flow needed by the applicant beyond that available from the network at the point -of -connection must be provided by the applicant as a private improvement on the customer side of the meter or backflow prevention device. All extensions or upgrades to the potable water network shall be designed to satisfy the following minimum standards: a. Minimum number of valves: i. 3 at cross intersections ii. 2 at "T" intersections iii. 500 feet maximum spacing iv. 1 valve at each fire hydrant lateral v. Pressure regulating valve station required between pressure zones b. Minimum number of fire hydrants (subject to approval by Livermore -Pleasanton Fire Department (LPFD) Fire Marshal i. 1 hydrant within 250 feet of any existing or proposed structure ii. 2 hydrants within 500 feet of any commercial, multi -family residential, industrial, or school building c. Minimum pipe size: 8 -inch diameter d. Minimum depth of cover over pipe: 42 inches e. Blowoff requirements: i. At all dead ends whether temporary or permanent ii. At all low points in the line f. Maximum flow velocity: 10 feet per second (fps) g. Minimum fire flows in gallons per minute (gpm): i. 1,500 gpm for 2 hours (rural residential) ii. 2,000 to 2,500 gpm for 2 hours (single family residential) iii. 2,500 gpm for 2 hours (multi -family residential)