ORD 2009 - Laserfiche WebLink

Accordingly, the project, as conditioned, is compatible with previously developed properties in the vicinity and adjacent proposed projects, and the natural, topographic features of the site. 4. Does grading take into account environmental characteristics and is it designed in keeping with the best engineering practices to avoid erosion, slides, or flooding to have as minimal an effect upon the environment as possible? The natural topography of the site is relatively flat. Minus the grading for the basin, minimal changes in grades are proposed. Relatively steep slope banks (2:1) are proposed in the basin. Additional slope stability information will be subject to the review and approval of the City Engineer prior to construction. As conditioned, the basin's slope banks will be revised to have a 3:1 slope, unless otherwise determined by the City Engineer. Based on basin modeling information provided to date, the City Engineer believes the entire basin can have a 3:1 slope, which is gentler than the 2:1 slope proposed for portions of the basin. The site is not located within an Alquist-Priolo Earthquake Fault Zone. The proposed project will require the construction of storm water detention facilities to contain the 100-year flood. An EIR mitigation measure for the project requires the site to be removed from the flood hazard area prior to occupancy. However, this is a City park and the Engineering Division will require this to be completed prior to the issuance of a building permit. Engineering modeling indicates that implementation of the Livermore flood protection improvements, as part of Livermore's approved El Charro Specific Plan, will provide sufficient detention to prevent inundation of the Staples Ranch site for the 100-year storm event. It is anticipated that Livermore will begin the construction of these improvements next year. To help prevent the erosion and pollution of the Arroyo Mocho, on site storm water will be treated on site for contaminates and directed into the basin, before being released into the Arroyo Mocho. On site erosion control and dust suppression measures will be documented in the improvement plans and inspected by the Building and Safety Division during construction. Accordingly, the grading, as conditioned, takes into account environmental characteristics and is designed in keeping with the best engineering practices to avoid erosion, slides, or flooding to have as minimal an effect upon the environment as possible. PUD Findings—PUD-80 Page 3 of 5