9 Va. Admin. Code § 25-875-510

Current through Register Vol. 41, No. 9, December 16, 2024

Section 9VAC25-875-510 - Stormwater management plan requirements

A. A stormwater management plan shall be developed and submitted to the VESMP authority or the department as the VSMP authority. The stormwater management plan shall be implemented as approved or modified by the VESMP authority or department and shall be developed in accordance with the following:

1. A stormwater management plan for a land-disturbing activity shall apply the stormwater management technical criteria set forth in this part 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.

2. A stormwater management plan shall consider all sources of surface runoff and all sources of subsurface and groundwater flows converted to surface runoff.

B. A complete stormwater management plan shall include the following elements:

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

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

3. A narrative that includes a description of current site conditions and final site conditions or if allowed by the VESMP authority or department, the information provided and documented during the review process that addresses the current 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;

5. Information on the proposed stormwater management facilities, including (i) detailed narrative on the conversion to a long-term stormwater management facility if the facility was used as a temporary ESC measure; (ii) the type of facilities; (iii) location, including geographic coordinates; (iv) acres treated; and (v) the surface waters or karst features 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 this chapter;

8. A map of the site that depicts the topography of the site and includes:

a. All contributing drainage areas;

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

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

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

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

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

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

h. Proposed land use with tabulation of the percentage of surface area to be adapted to various uses, including planned locations of utilities, roads, and easements;

9. If an operator intends to meet the requirements established in 9VAC25-875-580 or 9VAC25-875-600 through the use of offsite compliance options, where applicable, then a letter of availability from the offsite provider must be included; and

10. If payment of a fee is required with the stormwater management plan submission to the VESMP authority or the department, the fee in accordance with Part VIII (9VAC25-875-1290 et seq.) of this chapter must have been submitted.

C. All final plan elements, specifications, or calculations of the stormwater management plans whose preparation requires a license under Chapter 4 (§ 54.1-400 et seq.) or 22 (§ 54.1- 2200 et seq.) of Title 54.1 of the Code of Virginia shall be appropriately signed and sealed by a professional who is licensed to engage in practice in the Commonwealth of Virginia. Nothing in this subsection shall authorize any person to engage in practice outside that person's area of professional competence.

9 Va. Admin. Code § 25-875-510

Derived from Virginia Register Volume 40, Issue 8, eff. 7/1/2024.

Statutory Authority: § 62.1-44.15:28 of the Code of Virginia; Chapters 68 and 758 of the 2016 Acts of Assembly.