Standard Urban Storm Water Mitigation Plan Requirement Matrix Summary

Development/Redevelopment

Project Category

Tier I – Basic Requirements

Tier II – Use Specific

Tier III – Infiltration/Treatment

•  Single-family hillside home (<1 acre)

•  Natural area conservation
•  Slope and channel protection
•  No dumping signage
•  Roof runoff diversion to vegetated area
•  Route surface runoff to vegetated area

•  None

•  None

•  Single-family hillside (1 acre of more)

•  None

•  None

•  Installation of infiltration or treatment controls designed to meet volumetric or flow-based criteria (applies only to outdoor parking surfaces 5,000 square feet or more)

•  10-Plus Homes

•  No exceedance of pre-development peak flow runoff rate
•  No dumping signage
•  Proper trash design
•  Slope and channel protection

•  None

•  Same as above

•  Industrial or Commercial (43,560 square feet)

•  Same as for 10-plus homes

•  Design standards (if applicable) for loading dock areas, repair/mainten-ance bays, and vehicle/equipment wash areas

•  Same as above

•  Automotive Service Facilities

•  Same as for 10-plus homes

•  Design standards (if applicable) for fueling areas, repair/maintenance bays, and vehicle/equipment wash areas, loading/unloading dock areas

•  Same as above

•  Restaurants

•  Same as for 10-plus homes

•  Design standards (if applicable) for outdoor wash areas and grease traps/interceptors

•  Same as above

•  Parking Lots (5,000 square feet in surface area or 25 or more spaces)

•  Same as for 10-plus homes

•  None

•  Same as above

•  ESA (if 2500 square feet of impervious area is created and runoff from project is likely to impact a biological specifies or habitat)

•  May be the same as for 10-plus homes, depending on project use and whether runoff is likely to impact a biological species or habitat

•  May require any of the above standards if applicable

•  Installation of infiltration/treatment controls designed to meet volumetric or flow-based criteria (applies only to a hardscaped surface whereon a pollutant is expected to have an impact on a biological species or habitat)