(A) Definitions. The following definitions shall apply specifically to stormwater. All other definitions contained in this rule and not otherwise defined in this rule shall retain the meaning in the rules contained in definitions rule 901:10-1-01 of the Administrative Code and in Chapter 903. of the Revised Code.
(1) Best management practices for stormwater means erosion control, sediment control and water quality management practices that are the most effective and practicable means of controlling, preventing and minimizing degradation of surface water, including construction-phasing, minimizing the length of time soil areas are exposed, prohibitions and other management practices published by the state or other agencies, such as "Rainwater and Land Development, Ohio's Standards for Storm Water Management, Land Development and Urban Stream Protection, Third Edition, 2006," prepared by the Ohio department of natural resources, division of soil and water conservation.(2) Construction activity means clearing, grading, excavation, grubbing and filling.(3) Erosion means the wearing away of soil by rainfall, surface water runoff, wind or ice movement.(4) Erosion control means methods employed to prevent erosion. Examples include soil stabilization practices, horizontal slope grading, temporary or permanent cover and construction phasing.(5) Exposed soil area means all areas of the construction site where the perennial vegetation (including trees, shrubs and brush) has been removed. This includes topsoil stockpile areas, borrow areas and disposal areas within the construction site.(6) Final stabilization means that all soil disturbing activities at the site have been completed and that a uniform perennial vegetative cover with a density of seventy percent of the cover for unpaved areas and areas not covered by permanent structures has been established or equivalent permanent stabilization measures have been employed.(7) First order stream means all streams identified on a United States geological survey seven and five tenths minute topographical map by either a dashed or blue solid line.(8) Impervious surface means a constructed hard surface that either prevents or retards the entry of water into the soil and causes water to run off the surface in greater quantities and at an increased rate of flow than prior to development. Examples include rooftops, sidewalks, patios, driveways, parking lots, storage areas, and concrete, asphalt or gravel roads.(9) "National Pollutant Discharge Elimination System" (NPDES) means the program for issuing, modifying, revoking, reissuing, terminating, monitoring and enforcing permits under the Clean Water Act (Sections 301, 318, 402 and 405), 33 USC 1317 (February 4, 1987), 33 USC 1328 (December 27, 1977), 33 USC 1342 (February 7, 2014), 33 USC 1345 (February 4, 1987).(10) Permanent cover means final stabilization including, but not limited to, grass, gravel, asphalt and concrete.(11) Sediment means solid material, both mineral and organic, that is in suspension, is being transported or has been moved from its site of origin by air, water, gravity or ice and has come to rest on the earth's surface.(12) Sediment control means methods employed to prevent sediment from leaving the site. Sediment control practices include filter strips, silt fences, sediment traps, earth dikes, drainage swales, check dams, subsurface drains, pipe slope drains, storm drain inlet protection, and temporary or permanent sedimentation basins.(13) Soil means the unconsolidated, erodible earth material consisting of minerals or organics.(14) Stabilized means the exposed ground surface has been covered by staked sod, rip rap, wood fiber blanket, or other material, which prevents erosion from occurring. Grass seed by itself is not stabilization.(15) Stormwater means the precipitation runoff, stormwater runoff, snowmelt runoff and any other surface runoff and drainage defined in 40 CFR section 122.26(b)(13) (November 16, 1990). Stormwater does not include construction site dewatering or agricultural stormwater discharges. Stormwater resulting from an animal feeding facility includes immediate access roads and rail lines used or traveled by carriers of raw materials, products, waste materials, or by-products used or created by the facility, sites used for handling material other than manure, refuse sites, sites used for storage and maintenance of material handling equipment, shipping and receiving areas, and under the control of the owner or operator. All areas that fall within the meaning of production area are excluded from this definition.
(16) Temporary protection means temporary methods employed to prevent erosion. Examples of temporary protection include: straw, wood fiber blanket, wood chips and erosion netting.
(17) Waters of the state means all streams, lakes, ponds, marshes, watercourses, waterways, wells, springs, irrigation systems, drainage systems and other bodies or accumulations of water, surface and underground, natural or artificial which are situated wholly within, partly within or border upon this state or are within its jurisdiction, except those private waters which do not combine or effect a junction with natural surface or underground waters.(18) Wet weather discharge refers collectively to point source discharges that result from precipitation events, such as rainfall and snowmelt. Wet weather discharges include stormwater runoff, combined sewer overflows and wet weather sanitary sewer overflows. Stormwater runoff accumulates pollutants such as oil and grease, chemicals, nutrients, metals and bacteria as it travels across land.