§ 157.159 Performance Standards
Dimensional standards
Height & bulk
Servicing
- Applies near
- Chesapeake Bay Preservation Area
- Geographic extent
- Chesapeake Bay Preservation Area Overlay DistrictOverlay districtA second set of rules laid over the base district, adding requirements without replacing it., including Resource Protection Areas (RPAs) and Resource Management Areas (RMAs) as defined by the Occoquan Chesapeake Bay Preservation Area Map.
Extracted standards
10 individual requirements pulled out of this section’s prose, each with the sentence it came from.
Other
- Seaward 50 feet of buffer protected50 ft
The encroachment may not extend into the seaward 50 feet of the buffer area.
- RPA 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 where it does not exist.
- Maximum imperviousImpervious coverageThe share of a lot covered by anything water cannot soak through — roofs, drives, patios. cover increase for redevelopment10 pct
The redevelopment shall not increase the amount of impervious cover by more than 10% of the existing impervious cover on the site
- Maximum slope for clearing20 pct
Clearing, land disturbance, or development exceeding 500 square feet on slopes 20% or greater is prohibited.
- Minimum tree DBH to preserve6 in
Existing trees over six inches DBH shall be preserved outside the construction footprint.
- Minor WQIA maximum disturbance6,000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.
No more than 6,000 square feet of land disturbance
- Plan of development 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 shall be accomplished through a plan of development process
- Post-development pollutant load limit
For development, the post-development nonpoint source pollution runoff load shall not exceed the predevelopment load, based on a Chesapeake Bay watershed-wide average impervious surface cover of 16%.
- New septic tanks prohibitedProhibitedNot allowed in the district at all, short of rezoning or a variance.
New septic tanks and private sewage plants are not permitted.
- Tree replacement ratio1 ratio
replacement of existing trees and other vegetation will be achieved at a ratio of one planted tree to one removed.
From the ordinance
All development and redevelopment subject to this subchapter shall comply with the following performance standards... a 100-foot buffer area of vegetation... shall be retained if present and established where it does not exist.