local government selects road crossings and the high density greenways may be development option allowed where no within that WSIII practicable alternative watershed, then exists. These activities engineered stormwater shall minimize controls must be builtupon surface area, employed for the new direct runoff away development; from surface waters (F) If local governments and maximize the choose the high density utilization of BMPs; development option (I) No NPDES permits which requires shall be issued for engineered stormwater landfills that discharge controls, then they treated leachate; shall assume ultimate (ii) Critical Area Nonpoint responsibility for Source and Stormwater operation and Pollution Control Criteria: maintenance of the (A) Low Density Option: required controls as new development outlined in Rule .0104 limited to either no of this Subchapter; more than one (G) Minimum 100 foot dwelling unit of vegetative buffer is single family required for all new detached residential development activities development per acre that exceed the low (or 40,000 square foot density requirements as lot excluding roadway specified in Sub-Item rightofway) or 12 (3)(b)(i)(A) and percent builtupon area (3)(b)(ii)(A) of for all other this Rule, otherwise a residential and minimum 30 foot nonresidential vegetative buffer for development; development is stormwater runoff required along all from the development perennial waters shall be transported indicated on the most by vegetated recent versions of conveyances to the U.S.G.S. 1:24,000 (7.5 maximum extent minute) scale practicable; topographic maps or as (B) High Density Option: determined by local if new development government studies. exceeds the low Nothing in this Rule density requirements shall stand as a bar to specified in SubItem artificial streambank or (3)(b)(ii)(A) of this shoreline stabilization; Rule, then engineered (H) No new development stormwater controls is allowed in the must be used to buffer; water control runoff from dependent structures, the first inch of or other structures such rainfall; development as flag poles, signs and shall not exceed 30 security lights, which percent builtupon result in only de area; minimus increases in (C) No new permitted impervious area and sites for land public projects such as application of
local government selects the high density development option within that WSIII watershed, then engineered stormwater controls must be employed for the new development; (F) If local governments choose the high density development option which requires engineered stormwater controls, then they shall assume ultimate responsibility for operation and maintenance of the required controls as outlined in Rule .0104 of this Subchapter; (G) Minimum 100 foot vegetative buffer is required for all new development activities that exceed the low density requirements as specified in Sub-Item (3)(b)(i)(A) and (3)(b)(ii)(A) of this Rule, otherwise a minimum 30 foot vegetative buffer for development is required along all perennial waters indicated on the most recent versions of U.S.G.S. 1:24,000 (7.5 minute) scale topographic maps or as determined by local government studies. Nothing in this Rule shall stand as a bar to artificial streambank or shoreline stabilization; (H) No new development is allowed in the buffer; water dependent structures, or other structures such as flag poles, signs and security lights, which result in only de minimus increases in impervious area and public projects such as road crossings and greenways may be allowed where no practicable alternative exists. These activities shall minimize builtupon surface area, direct runoff away from surface waters and maximize the utilization of BMPs; (I) No NPDES permits shall be issued for landfills that discharge treated leachate; (ii) Critical Area Nonpoint Source and Stormwater Pollution Control Criteria: (A) Low Density Option: new development limited to either no more than one dwelling unit of single family detached residential development per acre (or 40,000 square foot lot excluding roadway rightofway) or 12 percent builtupon area for all other residential and nonresidential development; stormwater runoff from the development shall be transported by vegetated conveyances to the maximum extent practicable; (B) High Density Option: if new development exceeds the low density requirements specified in SubItem (3)(b)(ii)(A) of this Rule, then engineered stormwater controls must be used to control runoff from the first inch of rainfall; development shall not exceed 30 percent builtupon area; (C) No new permitted sites for land application of
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