"Parking Lot" means land area or facility for parking or storage of motor vehicles used for business, commerce, industry, or personal use, with a lot size of 5000 square feet or more of surface area, or with 25 or more parking spaces.
|Prevent storm water pollutants of concern such as heavy metals, oil and grease and polycyclic aromatic hydrocarbons that are deposited on parking lot surfaces by motor vehicles from entering into the stormwater conveyance system.
|Provide storm drain system Stenciling and Signage (only applicable if a catch basin is built on-site).
|Properly Design Trash Storage Areas if included.
- Must be screened or walled to prevent off site transport of trash.
- Must be paved to mitigate spills.
|Provide proof on ongoing BMP Maintenance (only applicable if a structural BMP is installed).
|Design Standards for Structural or Treatment Control BMPs:
Post-construction Treatment Control BMPs are required to incorporate, at minimum, either a volumetric or flow based treatment control design or both, to mitigate (infiltrate, filter or treat) storm water runoff on site.
|Properly Design Parking Area.
- Reduce impervious land coverage of parking area by providing planter strips between parking bays.
- Infiltrate runoff into landscape areas before it reaches the storm drain system.
- Treat runoff on-site before it reaches the street and storm drain system.
|The site drainage alternatives for parking lot developments may include one or a combination of the following:
- A vegetated infiltration trench or bio-swale (planter strip) that captures, infiltrates, and/or filters the stormwater runoff from the parking lot surfaces.
- Catch basins with filter inserts can be used for every 5000 square feet of parking lot area for sites where infiltration and bio-filtration are not suitable based on site conditions.
- Hydrodynamic system can be used for lot areas up to 20,000 square feet where infiltration and bio-filtration are not suitable based on site conditions.
FOR ADDITIONAL INFORMATION
A complete handbook titled "Development Best Management Practices Handbook, Part B – Planning Activities" describing the above requirements in detail is available here.