(A) The Perimeter Control Plan shall include measures to prevent sediment from leaving the site during initial disturbance activities and prior to temporary or permanent erosion prevention and/or sediment control practices.
(B) The Perimeter Control Plan shall address downstream outfall points, while the Grading Plan defines site-wide erosion prevention and sediment control measures.
(C) (1) The Perimeter Control Plan shall address prevention of sediment deposition on properties adjacent to the project site.
(2) Utilizing well-vegetated buffer strips along lower perimeters, sediment barriers, filters, diversion berms, sediment basins, or other means accepted by county may all be employed or combined to adequately protect adjacent properties.
(D) (1) In selection of sediment control measures, the type of flow, site terrain, soil type, and other relevant factors shall be considered. Buffer strips may only be utilized for sheet flow and must be at least 25 feet in width.
(2) If ineffective, a single sediment control device shall be supplemented with additional perimeter controls.
(E) (1) The Perimeter Control Plan shall address stabilizing construction entrances/exits to reduce the amount of sediment transported onto nearby roadways, and potentially into waterways.
(2) (a) Where possible, traffic entering a public right-of-way, alley, sidewalk, or parking lot shall first pass over a stabilized stone pad.
(b) This pad shall be at least six inches thick, 100 feet long, and contain two-inch to three-inch crushed coarse graded stone. If operating under seasonally wet conditions and/or soft soils, filter fabric shall underlie the stabilized stone pad.
(F) (1) The Perimeter Control Plan shall address protection of outlets such as pipes, drains, culverts, conduits, or channels by significantly minimizing erosion and sedimentation through reduction of the velocity of flows from the project site.
(2) The placement of rock, grouted riprap, or concrete rubble at the outlet of a pipe to prevent scour of the soil around the culvert mouth caused by the high pipe flow velocities or similar measures are encouraged.
(G) For construction sites less than one acre, a Perimeter Control Plan may be required, if deemed necessary.
(Ord. 2019-25, passed 10-15-2019)