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(A) The sediment and erosion control plan shall designate a series of practices which shall be implemented either at the direction of the permittee or the permittee’s representative on-site or at the direction of the Chief Subdivision Engineer should an inspection of the site indicate a deficiency in soil and sediment erosion control measures.
(B) As a minimum, these measures shall include the following:
(1) Sedimentation basins;
(2) Sediment traps;
(3) Diversion swales;
(4) Silt fences;
(5) Temporary seeding;
(6) Mulching; and
(7) Erosion control blankets.
(Ord. 10-164, passed 6-17-2010)
(A) Detailed construction phasing plan identifying sediment and erosion control measures to be in place for each phase shall be submitted prior to stripping the site of existing vegetation or cover.
(B) Sediment and erosion control measures to be installed initially prior to stripping existing vegetation or mass grading shall be indicated on the plans.
(C) Permanent stabilization measures shall be indicated on a separate plan.
(D) The expected two-year and ten-year runoff rates from all off-site areas draining into the site shall be identified on the plan.
(E) Methods for conveying flows through the site during construction shall be indicated. These methods must include the temporary and permanent stabilization measures to be used to reduce velocity and erosion from flow through the construction zone.
(F) A maintenance schedule of each measure used shall be indicated on the plan. As a minimum, all sediment and erosion control measures on-site shall be inspected weekly and also by the applicant’s designee or after a one-half inch or greater rainfall event and any required repairs shall be made to keep these measures functional as designed. All plan modifications shall be reviewed by the Chief Subdivision Engineer or his or her designee. A record of all repairs and modifications shall be maintained by the applicant and available for review by the Chief Subdivision Engineer or his or her designee.
(Ord. 10-164, passed 6-17-2010)
(A) To the extent practicable, proposed ditches and waterways that are to convey off-site flows through the site shall be stabilized upon construction.
(B) Where new waterways are constructed, they shall be stabilized to the extent practicable prior to their use to convey flood flows.
(Ord. 10-164, passed 6-17-2010)
(A) Stockpiles of soil and other erodable or floatable building materials (sand, limestone and the like) shall not be located in floodplains, overflow routes or areas subject to frequent inundation.
(B) If a stockpile is to remain in place for more than three days, then sediment and erosion control shall be provided for the stockpile.
(Ord. 10-164, passed 6-17-2010)
Graveled roads, access drives, parking areas of sufficient width and length and vehicle wash down facilities, if necessary, shall be provided to prevent soils from being tracked onto public or private roadways. Any soil tracked onto a public or private roadway shall be removed before the end of each workday or sooner as directed by the authority maintaining the roadway.
(Ord. 10-164, passed 6-17-2010)
Temporary stream crossings of intermittent and perennial streams used only for and during construction shall be designed to convey a two-year flood (minimum) or other flood event approved by the Chief Subdivision Engineer without overtopping unless a more frequent design event is allowed by the Chief Subdivision Engineer. The entire crossing shall be designed to withstand hydrodynamic forces and erosive forces up to the base flood event without washing out. Ephemeral streams may be crossed at temporary at-grade crossings provided that the crossing point is stabilized with materials resistive to the erosive forces produced by runoff from the upstream drainage area, and the design is approved by the Chief Subdivision Engineer. Temporary stream crossings shall be removed upon completion of construction activities. All temporary stream crossing shall be completely removed and the stream restored to its preconstruction condition upon completion of construction. Restoration shall incorporate appropriate vegetation consistent with the adjacent existing vegetation prior to construction or in accordance with a restoration plan approved by the Chief Subdivision Engineer.
(Ord. 10-164, passed 6-17-2010)
PROTECTION OF SPECIAL MANAGEMENT AREAS
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