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9VAC25-193-10. Definitions.

The words and terms used in this chapter shall have the meanings defined in 62.1-44.2 et seq. of the Code of Virginia (State Water Control Law) and 9VAC25-31 (VPDES Permit Regulation), unless the context clearly indicates otherwise, except that for the purposes of this chapter:

"Best management practices" or "BMPs" means schedules of activities, practices and prohibitions of practices, structures, vegetation, maintenance procedures, and other management practices to prevent or reduce the discharge of pollutants to surface waters. BMPs also include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage.

"Department" or "DEQ" means the Virginia Department of Environmental Quality.

"Industrial activity" means facilities or those portions of a facility where the primary purpose is classified as:

1. Standard Industrial Classification (SIC) Code 3271 - Concrete Block and Brick (Office of Management and Budget (OMB) SIC Manual, 1987);

2. SIC Code 3272 - Concrete Products, Except Block and Brick; or

3. SIC Code 3273 - Ready-Mixed Concrete, including both permanent and portable plants.

These facilities are collectively defined as "Concrete Products Facilities."

"Municipal separate storm sewer system" or "MS4" means a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains): (i) owned or operated by a state, city, town, county, district, association, or other public body (created by or pursuant to state law) having jurisdiction over disposal of sewage, industrial wastes, storm water, or other wastes, including special districts under state law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or a designated and approved management agency under  208 of the Clean Water Act (CWA) (33 USC  1251 et seq.) that discharges to surface waters of the state; (ii) designed or used for collecting or conveying storm water; (iii) which is not a combined sewer; and (iv) which is not part of a Publicly Owned Treatment Works (POTW).

"Runoff coefficient" means the fraction of total rainfall that will appear at the conveyance as runoff.

"Significant spills" includes, but is not limited to, releases of oil or hazardous substances in excess of reportable quantities under  311 of the Clean Water Act (see 40 CFR 110.10 and 40 CFR 117.21) or  102 of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) (42 USC  9601 et seq.) (see 40 CFR 302.4).

"Total maximum daily load" or "TMDL" means a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards and an allocation of that amount to the pollutant's sources. A TMDL includes wasteload allocations (WLAs) for point source discharges and load allocations (LAs) for nonpoint sources or natural background, or both, and must include a margin of safety (MOS) and account for seasonal variations.

"Vehicle or equipment degreasing" means the washing or steam cleaning of engines or other drive components of a vehicle or piece of equipment in which the purpose is to degrease and clean petroleum products from the equipment for maintenance purposes. Removing sediment and concrete residue is not considered vehicle or equipment degreasing.

Statutory Authority

62.1-44.15 of the Code of Virginia; 402 of the Clean Water Act; 40 CFR Parts 122, 123 and 124.

Historical Notes

Derived from Virginia Register Volume 14, Issue 24, eff. October 1, 1998; amended, Virginia Register Volume 19, Issue 23, eff. October 1, 2003; Volume 22, Issue 9, eff. February 8, 2006; Volume 29, Issue 16, eff. October 1, 2013.


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