§ 104-1-8. Conservation standards.

(a)

Conservation standards or standards shall be the State Erosion and Sediment Control Regulations, the Standards & Specifications as contained in the current Virginia Erosion and Sediment Control Handbook and the Public Facilities Manual with modifications as follows:

(1)

Standard & Specification #3.04 Straw Bale Barriers—Rebars are not to be used to stake these barriers. Straw bales are to be used only for sheet flow application; they are not to be used for any drainageway, or channel flow applications or site development perimeter control.

(2)

Standard & Specification #3.06 Brush Barrier—This practice is not to be used without the specific authorization of the Director.

(3)

Standard & Specification #3.07 Storm Drain Inlet Protection—Any storm drain inlet protection measure which completely blocks the drain throat or entrance is not to be used. Straw bales and cinder block wrapped with filter fabric are not to be used for curb inlet protection.

(4)

Standard & Specification #3.13 Temporary Sediment Trap—For land areas designated as Resource Protection Areas (RPAs), the storage volume shall be 202 cubic yards per acre of disturbed area. Pipe outlet sediment traps shall be required for drainage areas of one to three acres. For land areas designated as RPAs, pipe outlet sediment traps may also be required for areas of less than one acre where topographical and drainage conditions are favorable for field implementation (see Plate 2-11 of the current Public Facilities Manual for details). Stone outlets for temporary sediment traps under one acre of drainage area outside of RPAs shall be constructed according to current Virginia Erosion and Sediment Control Handbook specifications.

(5)

Standard & Specification #3.14 Temporary Sediment Basin—For land areas designated as RPAs, the storage volume shall be 202 cubic yards per acre of disturbed area.

(6)

Standard & Specification #3.34 Bermuda Grass and Zoysia Grass Establishment—This practice is not to be employed in Fairfax County.

(7)

Standard and Specification #3.38 Tree Preservation and Protection—This section is not to be used in Fairfax County. In its place, Chapter 12, "Tree Conservation," of the Public Facilities Manual shall be used.

(8)

Standard & Specification #3.02 Temporary Stone Construction Entrance—The minimum length for the temporary gravel construction entrance shall be 75 feet and a woven filter fabric underliner is required. If the action of vehicles traveling over the gravel pad is not sufficient to remove the majority of the mud, then a wash rack shall be required with an appropriate water source to wash the mud off the tires before entering the public road.

(9)

Standard & Specification #3.31 Temporary Seeding—Temporary seeding and mulching shall be required once an area is denuded for a maximum of 14 days except for that portion of the site in which work will be continuous beyond 14 days. For winter stabilization, any area denuded for 14 days after November 1, shall be seeded and mulched with the appropriate seed mixture as specified in Chapter 3 of the current Virginia Erosion and Sediment Control Handbook.

(10)

Standard & Specification #3.05 Silt Fence—Manufacturer's certification shall be required to meet the physical properties given for synthetic filter fabric per the construction specifications as specified in the current Fairfax County Checklist for Erosion and Sediment Control Manual. This certification shall be presented to the Fairfax County inspector prior to installation in the field.

When the standards vary between the publications, the most stringent standard shall apply.

(b)

Authorization for more stringent standards. The Board of Supervisors is authorized to adopt more stringent soil erosion and sediment control regulations than those necessary to ensure compliance with the State's minimum regulations. However, this section shall not be construed to authorize the Board of Supervisors to impose any more stringent regulations for plan approval or permit issuance than those specified in Sections 104-1-3 and 104-1-4.

(c)

Stream restoration and relocation projects that incorporate natural channel design concepts are not man-made channels and shall be exempt from any flow rate capacity and velocity requirements for natural or man-made channels as defined in any regulations promulgated pursuant to Virginia Code §§ 62.1-44.15:52, 62.1-44.15:54 or 62.1-44.15:65 or this section. Any plan approved prior to July 1, 2014, that provides for stormwater management that addresses any flow rate capacity and velocity requirements for natural or man-made channels shall satisfy the flow rate capacity and velocity requirements for natural or man-made channels if the practices are designed to (i) detain the water quality volume and to release it over 48 hours; (ii) detain and release over a 24-hour period the expected rainfall resulting from the one-year, 24-hour storm; and (iii) reduce the allowable peak flow rate resulting from the 1.5-year, two-year, 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 requirement for natural or man-made channels as defined in regulations promulgated pursuant to Virginia Code §§ 62.1-44.15:54 or 62.1-44.15:65 or this section. For plans approved on and after July 1, 2014, the flow rate capacity and velocity requirements of this subsection shall be satisfied by compliance with water quantity requirements in the Stormwater Management Act (Virginia Code § 62.1-44.15:24 et seq.) and attendant regulations, unless such land-disturbing activities are in accordance with the grandfathering provisions of the Virginia Stormwater Management Program (VSMP) Permit Regulations.

(5-82-104; 27-88-104; 15-8-104; 9-90-104; 21-93-104; 38-94-104; 62-08-104; 24-11-104; 04-14-104.)

(5-82-104; 27-88-104; 15-8-104; 9-90-104; 21-93-104; 38-94-104; 62-08-104; 24-11-104; 04-14-104.)