PT-2: Permeable Pavement

Goal

Improve flow control and quality of stormwater runoff through use of permeable pavement technologies. 

Requirements

Use a permeable (porous) pavement or pavers to control and treat at least 50% of the 90th percentile average annual rainfall event post-construction runoff volume to 25 mg/L concentration of total suspended solids (TSS) or less.

Documentation

• Copy of the drainage or hydrology report and supporting calculations showing treatment area and percent treatment achieved. This document may be included as part of the submittal requirements for PR-8 Low Impact Development, but relevant permeable pavement calculations, areas, and treatment levels should be highlighted for this credit.
• Copy of the permeable pavement mix design. The mix design should have the following items highlighted:
  • Name of permeable technology, if used (e.g. pavers, turf, etc.)
  • Total tons of pavement on the project, including portland cement concrete and asphalt concrete (hot, warm and cold mix)
  • Total air voids in the mix (or manufacturer-tested voids specifications for pavers based on method of installation)
  • Total tons of permeable pavement used
• Copy of the maintenance plan in-place for the permeable pavement(s).
• Photo of the permeable pavement(s) installed on the project.

Public commentary on credit PT-2