(A) This chapter, the State Erosion and Sediment Control Handbook, and all locally adopted guidelines, procedures, and standards shall comprise and be integral parts of the town erosion and sediment control program.
(B) The guidelines, procedures, and other elements of the local control program shall be developed consistent with the state program and guidelines.
(C) To carry out the local control program, conservation standards are established. Such standards shall include criteria, guidelines, techniques, and methods for the control of erosion and sedimentation. (See § 152.05(A).) The conservation standards shall be included in part III of the State Erosion and Sediment Control Handbook.
(D) The standards and specifications of the State Erosion Control Handbook shall be modified within the town as follows.
(1) Temporary gravel construction entrances (minimum standard #17) shall have a minimum length of 70 feet and minimum width of 12 feet. Wash racks with appropriate water sources shall also be provided for washing mud off the tires of construction vehicles before entering the public road. Wash water shall be directed to a settling area for sediment removal.
(2) Straw bale barriers (standard and specification #3.04) shall be used only for sheet flow application and not as perimeter controls or in any channel or drainageway.
(3) Brush barriers (standard and specification #3.06) shall not be acceptable for use in the town.
(4) Storm drain inlet protection (standard and specification #3.07) shall consist of VDOT #3, #357 or #5 stone wrapped in wire mesh and supported by concrete blocks, or standard block and gravel devices as illustrated in the State Erosion and Sediment Control Handbook. Inlet protection devices will not be considered sufficient protection for drainage areas of one acre or more.
(5) Temporary sediment traps (standard and specification #3.13) shall be cleaned of sediment after every storm or shall be sized to provide storage volume of 134 cubic yards per acre of drainage area and be cleared out when half the storage volume is displaced by trapped sediment. Stone outlets for sediment traps shall be constructed with VDOT #3, #357, or #5 course aggregate and faced on the upstream side with a one-foot-thick layer of VDOT class 1 stone.
(6) Temporary sediment basins (standard and specification #3.14) shall be provided for any disturbed area exceeding three acres.
(7) Temporary seeding (standard and specification #3.31) with mulching is required for all denuded areas where no land disturbing construction activities take place for a period exceeding 14 days.
(E) Stream restoration and relocation projects that incorporate natural channel design concepts are not human-made channels and shall be exempt from any flow rate capacity and velocity requirements for natural or human-made channels as defined in any regulations promulgated pursuant to VA Code §§ 62.1-44.15:54 et seq.. Any land disturbing activity that provides for stormwater management intended to address any flow rate capacity and velocity requirements for natural or human-made channels shall satisfy the flow rate capacity and velocity requirements for natural or human-made channels if the practices are designed to: detain the water quality volume and to release it over 48 hours; detain and release over a 24-hour period the expected rainfall resulting from the one year, 24-hour storm; and reduce the allowable peak flow rate resulting from the 1.5-, 2-, and 10-year, 24-hour storms to a level that is less than or equal to the peak flow rate from the site assuming it was in a good forested condition achieved through multiplication of the forested peak flow rate by a reduction factor that is equal to the runoff volume from the site when it was in a good forested condition divided by the runoff volume from the site in its proposed condition, and shall be exempt from any flow rate capacity and velocity requirements for natural or human-made channels as defined in any regulations promulgated pursuant to VA Code §§ 10.1-562 or 10.1-570.
(1998 Code, § 18-34) (Ord. O-2009-02, passed 7-14-2009)