Any discharger may be required by (C) Land within the the Commission to disclose all watershed shall be chemical constituents present or deemed compliant with potentially present in their wastes and the density chemicals which could be spilled or requirements if the be present in runoff from their facility following condition is which may have an adverse impact on met: the density of all downstream water quality. These existing development facilities may be required to have at the time of spill and treatment failure control reclassification does plans as well as perform special not exceed the density monitoring for toxic substances; requirement when (b) Nonpoint Source and Stormwater densities are averaged Pollution: none that would adversely throughout the entire impact the waters for use as water watershed area; supply or any other designated use; (D) Cluster development is (i) Nonpoint Source and allowed on a Stormwater Pollution projectbyproject basis Control Criteria For Entire as follows: Watershed: (I) overall density (A) Low Density Option: of the project development density meets must be limited to associated either no more than density or two dwelling units of stormwater single family detached control residential requirements development per acre of this Rule; (or 20,000 square foot (II) buffers meet lot excluding roadway the minimum rightofway) or 24 statewide water percent builtupon area supply for all other residential watershed and nonresidential protection development in requirements; watershed outside of (III) builtupon areas the critical area; are designed stormwater runoff from and located to the development shall minimize be transported by stormwater vegetated conveyances runoff impact to the maximum extent to the receiving practicable; waters, (B) High Density Option: minimize if new development concentrated density exceeds the stormwater low density option flow, maximize requirements specified the use of sheet in SubItem (3)(b)(i)(A) flow through of this Rule then vegetated development must areas, and control runoff from the maximize the first inch of rainfall; flow length new residential and through nonresidential vegetated development shall not areas; exceed 50 percent (IV) areas of builtupon area; concentrated development
Any discharger may be required by the Commission to disclose all chemical constituents present or potentially present in their wastes and chemicals which could be spilled or be present in runoff from their facility which may have an adverse impact on downstream water quality. These facilities may be required to have spill and treatment failure control plans as well as perform special monitoring for toxic substances; (b) Nonpoint Source and Stormwater Pollution: none that would adversely impact the waters for use as water supply or any other designated use; (i) Nonpoint Source and Stormwater Pollution Control Criteria For Entire Watershed: (A) Low Density Option: development density must be limited to either no more than two dwelling units of single family detached residential development per acre (or 20,000 square foot lot excluding roadway rightofway) or 24 percent builtupon area for all other residential and nonresidential development in watershed outside of the critical area; stormwater runoff from the development shall be transported by vegetated conveyances to the maximum extent practicable; (B) High Density Option: if new development density exceeds the low density option requirements specified in SubItem (3)(b)(i)(A) of this Rule then development must control runoff from the first inch of rainfall; new residential and nonresidential development shall not exceed 50 percent builtupon area; (C) Land within the watershed shall be deemed compliant with the density requirements if the following condition is met: the density of all existing development at the time of reclassification does not exceed the density requirement when densities are averaged throughout the entire watershed area; (D) Cluster development is allowed on a projectbyproject basis as follows: (I) overall density of the project meets associated density or stormwater control requirements of this Rule; (II) buffers meet the minimum statewide water supply watershed protection requirements; (III) builtupon areas are designed and located to minimize stormwater runoff impact to the receiving waters, minimize concentrated stormwater flow, maximize the use of sheet flow through vegetated areas, and maximize the flow length through vegetated areas; (IV) areas of concentrated development
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