ORD 1503 - Laserfiche WebLink

b. Where necessary, natural creeks shall be armoured (stabilized) as required by the City Engineer subject to the approval of any other agency claiming jurisdiction. Visual and biological effects shall be important considerations in the type of protection used. Alternatives to riprap and gabions should be explored which allow trees and native grasses to grow along the creek. c. A long-term erosion maintenance plan shall be developed by the applicant's engineer and landscape architect,. and shall be subject to the approval of the City Engineer prior to any final map approval. The plan shall include the following: maintenance provisions by the homeowners association, which shall be incorporated in the CC&R's for the project; seeding and mulching, rates, and areas; a timetable for the implementation of the measures; maps shall be developed which show existing contours, final contours, locations of erosion control measures, limits of clearing and grading, existing vegetation, location of sediment basins, traps, silt fences, and other sediment retention structures; an inspection schedule, location of maintenance materials, and provisions for sediment disposal; be implemented by October 1 of the year in which grading occurs; and unless otherwise approved by the City Engineer, grading shall not occur during the rainy season (October 15-April 30). 20. Air Quality a. The applicant shall require all construction contractors to water exposed surfaces in late morning. and at the end of each work day, with increased watering when wind speeds exceed ten mph. Contractors shall. also be required to cleanup mud and dust carried onto City streets by construction vehicles on a daily basis or more frequen~y as determined necessary by the City Engineer. 21. Drainage a. A drainage plan shall be prepared which analyzes the impact on fills and cuts on the existing drainage. Specific mitigation, including the location of planned drainage diversions or alterations, minimum culvert size and energy dissipators, locations and constructions details of subdrains (if necessary) shall be provided. An overview of this information shall accompany any tentative map application and design level details shall accompany any final map. b. AH known or potential springs and groundwater flows shall be identified on any tentative map application. Lots and buildings shall be designed in such a manner as to prevent alterations to these natural drainage ways. The tentative map shall include information on subdrain requirements. c. The storm drain system for the project shall be designed such that the summer flows stay within the piped storm drain system. The winter flows shall be allowed to flow into the natural creeks. The specific details of the storm drain system shall be submitted in conjunction with any tentative map application.