Sec. 13-105(A)

Other

• Plan approval validity5 years

  An approved plan shall remain valid for a period of five years from the date of approval

• Buffer encroachment seaward limit50 ft

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

• Buffer area width100 ft

  A buffer area of 100 feet (measured from top of bank) located adjacent to and landward of the components

• Maximum civil penalty5,000 usd

  Any person who violates any provision of this article shall be subject to a civil penalty of not more than $5,000 for each violation.

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

  Activities that disturb less than 2,500 square feet of land, unless the activity is part of a larger common plan of development or sale.

• ImperviousImpervious coverageThe share of a lot covered by anything water cannot soak through — roofs, drives, patios. cover minimization

  Development or redevelopment shall minimize impervious cover consistent with the proposed use or development.

• Indigenous vegetation preservation

  Indigenous vegetation shall be preserved to the maximum extent practicable consistent with the use, development, or redevelopment proposed.

• Peak runoff control

  stormwater management facilities shall be designed to control the post-development peak runoff rate to the pre-development peak runoff rate for the 2-year, 10-year, and 25-year storm events

• Redevelopment water quality volume50 pct

  For redevelopment, the water quality volume shall be 50 percent of the Alexandria water quality volume default

• Water quality impact assessment threshold1 acreacre43,560 square feet — about the size of an American football field without the end zones.

  Land disturbance of one acre or greater

• Water quality volume treatment

  The entire water quality volume from the site shall be treated.