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Page 19 in a format consistent with the “Calculation Form – District Rational Method” available in the manual. The calculations shall demonstrate adequate freeboard given the design storm event assuming all bioretention areas are overflowing. Said calculations shall be prepared, stamped, and signed by a California-licensed civil engineer. (Address this condition prior to plan approval) 95. EMERGENCY OVERLAND STORMWATER FLOW/SUMP PROPERTIES: All properties shall be designed with an emergency overland flow path to direct storm runoff to the nearest public street or open flood control facility in the event on-site pipes become plugged. The flow path shall be lower than the finish floor elevation of all habitable structures. The flow path cannot rely on 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) 96. 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) iv. 2,500 gpm for 2 hours (social/recreation) v. 3,500 gpm for 2 hours (schools/commercial/public/institutional) vi. 4,000 gpm for 4 hours (industrial in the lower pressure zone only) vii. 5,000 gpm for 4 hours (industrial in all other pressure zones) h. Minimum pressures: