Sec. 70-451(c)

Other

• Buffer encroachment seaward limit50 ft

  The encroachment may not extend into the seaward 50 feet of the buffer area.

• Buffer nutrient reduction40 pct

  The 100-foot buffer area shall be deemed to achieve a 75 percent reduction of sediments and a 40 percent reduction of nutrients.

• Buffer sediment reduction75 pct

  The 100-foot buffer area shall be deemed to achieve a 75 percent reduction of sediments and a 40 percent reduction of nutrients.

• Buffer width100 ft

  a 100-foot buffer area of vegetation that is effective in retarding runoff, preventing erosion, and filtering nonpoint source pollution from runoff shall be retained if present and established during development where it does not exist.

• Plan of development disturbance threshold2,500 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Any development or redevelopment exceeding 2,500 square feet of land disturbance in the Chesapeake Bay Preservation Area (CBPA) shall be accomplished through a plan of development process prior to any clearing or grading of the site or the issuance of any building permit.

• Replacement tree minimum DBH2.5 in

  Replacement trees shall be a minimum of 2½ inches DBH at the time of planting.

• Stormwater plan waiver imperviousImpervious coverageThe share of a lot covered by anything water cannot soak through — roofs, drives, patios. cover threshold16 pct

  Impervious cover is less than 16 percent of the site; and Development is for a single-family residence, or addition to existing homes, or utility buildings, garages, and other structures accessory to single-family residences, and agriculture structures, on a lot or parcel one acre or larger in size.

• Tree replacement ratio2 ratio

  replacement of existing trees and other vegetation will be achieved at a ratio of two planted trees to one removed.

• Water quality impact assessment disturbance threshold50,000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  A water quality impact assessment is required for any land disturbance, proposed development or redevelopment, within an RPA, including any buffer area modification or encroachment as provided for in section 70-451(c)(2) and in any development in the RMA if: 1. The proposed land disturbance exceeds 50,000 square feet; or 2. The proposed development results in more than 60 percent impervious cover on the lot or parcel being developed.

• Water quality impact assessment imperviousImpervious coverageThe share of a lot covered by anything water cannot soak through — roofs, drives, patios. cover threshold60 pct

  The proposed development results in more than 60 percent impervious cover on the lot or parcel being developed.