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Ordinance No. 2245 Page 25 of 37 71. SURVEY MONUMENTS FOR HORIZONTAL CONTROL: Final maps shall include sufficient durable survey monuments to allow the subdivision to be retraced in conformance with Pleasanton Municipal Code §19.24.220. Setting of monuments shall be in accordance with California Government Code §66495-66498. The surveyor shall give notice to the City Engineer when final monuments have been set, and when payment for said work has been received from the subdivider. (Address this condition prior to acceptance of improvements) 72. STORMWATER HYDRAULICS: The City's storm drainage network has been designed in accordance with the Alameda County Hydrology and Hydraulics Manual published by the Alameda County Flood Control & Water Conservation District. Said manual is available for download at: https://acfloodcontrol.org/the-work-we-do/the-work-we-do-hydrology-manual/ The City is located in Zone 7, and its storm drain pipe network is considered a secondary facility. Any connections to, additions, or upgrades to the City's pipe network shall be designed in accordance with the manual. Calculations submitted for review/approval shall be presented 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) 73. 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) 74. 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: Minimum Manning Coefficient (n) within the pipe = 0.013 Minimum flow velocity = 2 feet per second at least once per day Maximum flow velocity = 10 feet per second Maximum depth of flow to pipe diameter (d/D) = 0.75 for dry weather flow conditions