All earth disturbance activities shall be performed so as to minimize erosion and sedimentation. All Site Stabilization and Soil Erosion and Sedimentation Control Plans shall, as a minimum, be in accordance with the standards and specifications as set forth in the U.S. Department of Agriculture, Soil Conservation Service Publication, "Water Management and Sediment Control for Urbanizing Areas", latest edition, and the following standards. This Manual in its entirety is hereby adopted by reference as the official Soil Erosion and Sedimentation Control Manual of the City.
(a) Timing of Sediment-Trapping Practices.
(1) Sediment control practices shall be functional throughout earth disturbance activity.
(2) Settling facilities, perimeter controls, and other practices intended to trap sediment shall be implemented as the first step of grading and within seven days from the start of grubbing. They shall continue to function until the upslope development area is re-stabilized.
(b) Stabilization of Denuded Areas. Denuded areas shall have soil stabilization applied within seven days if they are to remain dormant for more than thirty days. Permanent or temporary soil stabilization shall e applied to denuded areas within seven days after final grade is reached on any portion of the site, and shall also be applied within seven days to denuded areas which may not be at final grade, but shall remain dormant (undisturbed) for longer than thirty days.
(c) Settling Facilities.
(1) Concentrated storm water runoff from denuded areas shall pass through a sediment basin.
(2) The basin's storage capacity shall be sixty-seven cubic yards per acre of drainage area.
(d) Sediment Barriers.
(1) Sheet flow runoff from denuded areas shall be filtered or diverted to a sediment basin.
(2) Sediment barriers such as sediment fence or diversions to sediment basins shall protect adjacent properties and watercourses from sediment pollution.
(e) Storm Sewer Inlet Protection. All storm sewer inlets which accept storm water runoff from the development area shall be protected so that sediment-laden water shall not enter the storm sewer system without first being filtered or otherwise treated to remove sediment.
(f) Construction Access Routes. Measures shall be taken to prevent soil transport onto highways or surfaces where runoff is not checked by soil erosion and sediment controls.
(g) Sloughing and Dumping.
(1) No soil, rock, debris or any other material shall be dumped or placed into watercourses or wetlands or into such proximity that it may readily slough, slip or erode into a watercourse or wetland unless such dumping or placement is authorized by the Building Inspector, and where applicable, the U.S. Army Corps of Engineers.
(2) Unstable soils prone to slipping or landsliding shall not be graded, cut, filled or have loads imposed upon them except in accord with Section 1339.08.
(h) Stabilization of Outfalls and Channels. Outfalls and constructed or modified channels shall be designed and constructed to withstand the expected velocity of flow from the ten-year, post-development storm without eroding.
(i) Establishment of Permanent Vegetation.
(1) A permanent vegetative cover shall be established on denuded areas not otherwise permanently stabilized.
(2) Permanent vegetation shall not be considered established until ground cover is achieved which, in the opinion of the Building Inspector, provides adequate cover and is mature enough to control soil erosion and sedimentation satisfactorily and to survive adverse weather conditions.
(j) Disposition of Temporary Practices. All temporary soil erosion and sedimentation control practices shall be removed within thirty days after final site stabilization is achieved or after the temporary practices are no longer needed, unless otherwise authorized by the Building Inspector. Trapped sediment shall be permanently stabilized to prevent further erosion.
(Ord. 1991-122. Passed 11-18-91.)