§ 6-6. Stormwater management plan; contents of plan.

(a)

The Stormwater Management Plan, required in section 6-4 of this chapter, must apply the stormwater management technical criteria set forth in section 6-9 of this chapter to the entire land-disturbing activity. Individual lots in new residential, commercial, or industrial developments, including those developed under subsequent owners, shall not be considered separate land-disturbing activities. The Stormwater Management Plan shall consider all known sources of surface runoff and all known sources of subsurface and groundwater flows converted to surface runoff, and include the following information:

(1)

Information on the type and location of stormwater discharges; information on the features to which stormwater is being discharged including surface waters or karst features, if present, and the predevelopment and post-development drainage areas;

(2)

Contact information including the name, address, email address, and telephone number of the owner and the tax reference number, parcel number, and RPC of the property or properties affected;

(3)

A narrative that includes a description of current site conditions and final site conditions;

(4)

A general description of the proposed stormwater management facilities and the mechanism through which the facilities will be operated and maintained after construction is complete and a note that states the stormwater management meets the requirements set forth in the VSMP Permit Regulations (9VAC25-870-55) and the Administrative Guidance Manual;

(5)

Information on the proposed stormwater management facilities, including:

(i)

The type of facilities;

(ii)

Location, including geographic coordinates;

(iii)

Acres treated; and

(iv)

The surface waters or karst features, if present, into which the facility will discharge.

(6)

Hydrologic and hydraulic computations, including runoff characteristics;

(7)

Documentation and calculations verifying compliance with the water quality and quantity requirements of section 6-9 of this chapter and the Administrative Guidance Manual; and

(8)

A map or maps of the site that depicts the topography of the site and includes:

(i)

All contributing drainage areas;

(ii)

Existing streams, ponds, culverts, ditches, wetlands, other water bodies, and floodplains;

(iii)

Soil types, geologic formations if karst features are present in the area, forest cover, and other vegetative areas;

(iv)

Current land use including existing structures, roads, and locations of known utilities and easements;

(v)

Sufficient information on adjoining parcels to assess the impacts of stormwater from the site on these parcels;

(vi)

The limits of clearing and grading, and the proposed drainage patterns on the site;

(vii)

Proposed buildings, roads, parking areas, utilities, and stormwater management facilities; and

(viii)

Proposed land use with tabulation of the percentage of surface area to be adapted to various uses, including but not limited to planned locations of utilities, roads, and easements.

(b)

If an operator intends to meet the water quality and/or quantity requirements set forth in section 6-9 of this chapter through the use of off-site compliance options, where applicable, then a letter of availability from the off-site provider must be included. Approved off-site options must achieve the necessary nutrient reductions prior to the commencement of the applicant's land-disturbing activity except as otherwise allowed by § 62.1-44.15:35 of the Code of Virginia.

(c)

Elements of the stormwater management plans that include activities regulated under Chapter 4 (§ 54.1-400 et seq.) of Title 54.1 of the Code of Virginia shall be appropriately sealed and signed by a professional registered in the Commonwealth of Virginia pursuant to Article 1 (§ 54.1-400 et seq.) of Chapter 4 or Chapter 22 (§ 54.1-2200 et seq.) of Title 54.1 of the Code of Virginia and shall hold a certificate of competence in the appropriate subject area, as provided in § 62.1-44.15:30.

(d)

A construction record drawing for permanent stormwater management facilities shall be submitted to the Administrator. The construction record drawing shall be appropriately sealed and signed by a professional engineer, architect, landscape architect, or land surveyor registered in the Commonwealth of Virginia, certifying that the stormwater management facilities have been constructed in accordance with the approved plan.

(e)

In lieu of local review of the stormwater management plan required by this chapter, for any land-disturbing activity of 2,500 square feet or more but less than one acre in extent, the permit applicant may submit a set of plans and supporting calculations prepared by a licensed professional retained by the applicant. Such professional shall be licensed to engage in practice in the Commonwealth and hold a certificate of competence in the appropriate subject area.

Such plans and supporting calculations shall be appropriately signed and sealed by the professional with a certification that states: "This plan is designed in accordance with applicable state law and regulations."

(Ord. of 6-3-2014(1), § 1-6; Ord. of 9-3-2019)

(Ord. of 6-3-2014(1), § 1-6; Ord. of 9-3-2019)