The following criteria apply to Storm Water Management Plans and for land disturbing or development activities that result in run-off leaving the site or run-off remaining on the site.
(A) Channeled run-off from adjacent areas that passes through the site must be diverted around disturbed areas, if practical. If diversion is not practical, the channel must be protected. Sheetflow run- off from adjacent areas greater than 10,000 square feet must also be diverted around disturbed areas, if practical. Diverted run-off must be conveyed in a manner that will not erode the conveyance and receiving channels.
(B) All activities on the site must be conducted in a logical sequence to minimize the area of bare soil that is exposed at any one time.
(C) Run-off from the entire disturbed area on the site must be controlled by meeting either divisions (C)(1) and (C)(2) or divisions (C)(1) and (C)(3) below.
(1) All disturbed ground that is left inactive for 14 or more days must be stabilized by seeding or installing sod. If the date is after September 15, the ground must be covered by mulch or other equivalent erosion control material.
(2) For sites that have more than ten acres that will be disturbed at one time, or if a channel originates in the disturbed area, one or more temporary or permanent sedimentation basins must be constructed. Each sedimentation basin must have a volume below the normal water level of at least 1,800 cubic feet per acre of the area draining to the basin, be at least three feet deep and must be constructed in accordance with accepted design specifications. Sediment must be removed on a regular basis so that a depth of at least three feet can be maintained. The sedimentation basin’s discharge rate must also be sufficiently low enough so that it does not cause erosion along the discharge channel or the receiving water.
(3) For all sites subject to this subchapter, silt fences, straw bales or equivalent erosion control measures must be placed along all side and down slopes of the site. If a channel or area of concentrated run-off passes through the site, silt fences must be placed along the channel’s edges to reduce the likelihood of sediment reaching the channel. A maintenance and inspection schedule must be provided when using silt fences, straw bales or equivalent erosion control measures.
(D) Any soil or dirt storage piles containing more than 20 cubic yards of material must not be located with a down slope drainage length of less than 25 feet from the toe of the pile to a street or drainage channel. If the pile is to remain for less than 14 days, erosion must be controlled by placing straw bales or silt fence barriers around the pile. If the pile is to remain for more than 14 days, it must be stabilized by adding mulch, vegetative cover, tarps or other means. In-street utility repair or construction soil or dirt storage piles located closer than 225 feet of a street or drainage channel must be covered with tarps or suitable alternative control, if exposed for more than seven days. Storm drain inlets must also be protected with straw bales or other appropriate filtering barriers.
(Prior Code, § 430.15) (Ord. 2008-05, passed 5-21-2008)