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Ordinance No. Page 24 d. Dedications in fee title shall only be granted upon approval by the City Engineer. Consistent with California Government Code Section 66439(d)(2), the offer shall include the statement, "The real property described below is dedicated in fee for public purposes..." (Address this condition prior to recordation of map or separate instrument title documents granting rights to the City) 69. DATUM FOR VERTICAL CONTROL: Vertical control surveying for all improvements to be constructed shall be based on the North American Vertical Datum of 1988 (NAVD 88). Any benchmarks used that relied on the National Geodetic Vertical Datum of 1929 (NGVD 29) shall be converted to NAVD 88 when presented on plans. The location of the benchmark and source of data must also be disclosed on the plans. (Address this condition prior to plan approval) 70. 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) 71. 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) 72. 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)