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DRA <br />F <br />T <br /> <br /> <br /> <br /> <br />P18-0078, P18-0080, P18-0081, PUD-130, and Tract 8569 PC-2026-09, April 22, 2026 <br /> <br />17 of 36 <br /> <br />b. R-value of the underlying soil shall be R = 5 minimum. A higher R-value will be <br />allowed only through analytic testing by a licensed geotechnical engineer or <br />engineering geologist. <br /> <br />c. Asphalt Binder classification shall be PG 64-10. <br /> <br />d. Minimum Traffic Index (TI) shall be as follows. A lower TI will be considered only <br />when justified by analytic calculations performed by a licensed civil or traffic <br />engineer according to the Caltrans Highway Design Manual Chapter 613. <br />i. Public parking lot: TImin = 4.5 <br />ii. Local Street: TImin = 5.0 <br />iii. Residential collector street: TImin = 6.0 <br />iv. Collector street: TImin = 7.0 <br />v. Arterial street: TImin = 9.0 <br /> <br />e. Minimum thickness of HMA layer = 3 inches <br /> <br />f. Minimum thickness of total structural section = 8 inches (regardless of R-value). <br />(Address this condition prior to plan approval). <br /> <br />50. HYDROLOGIC AND HYDRAULIC CALCULATIONS: The City’s storm drainage network <br />has been designed in accordance with the Alameda County Hydrology and Hydraulics <br />Manual published by the Alameda County Flood Control & Water Conservation District. <br />Said manual is available for download at: https://acfloodcontrol.org/the-work-we-do/the- <br />work-we-do-hydrology-manual/. <br /> <br />The City is located in Zone 7, and its storm drain pipe network is considered a <br />secondary facility. Any additions or upgrades to the City’s pipe network shall be <br />designed in accordance with the manual. Calculations submitted for review/approval <br />shall be presented in a format consistent with the “Calculation Form – District Rational <br />Method” available in the manual. Said calculations shall be prepared, stamped, and <br />signed by a California-licensed civil engineer. (Address this condition prior to <br />improvement plan approval). <br /> <br />51. EMERGENCY OVERLAND STORMWATER FLOW/SUMP PROPERTIES: All <br />properties shall be designed with an emergency overland flow path to direct storm <br />runoff to the nearest public street or open flood control facility in the event on-site pipes <br />become plugged. The flow path shall be lower than the finish floor elevation of all <br />habitable structures. The flow path cannot rely on neighboring properties unless a storm <br />drain easement across the neighbor is obtained. Sump properties must be designed to <br />discharge the 50-year recurrence interval storm event through the pipe network before <br />habitable structures become inundated. <br />