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- Info for Contractors and Developers
Info for Contractors and Developers
Sediment is the biggest pollutant associated with construction site storm water runoff. Uncontrolled storm water runoff from construction sites can significantly impact rivers, lakes and estuaries because the sediment can reduce the amount of sunlight reaching aquatic plants, clog fish gills, smother aquatic habitat and spawning areas, and impede navigation. Construction sites that disturb one acre or more of land must apply for and be issued a notice of coverage from the Tennessee Department of Environment and Conservation (TDEC) before any work can begin.
Construction Site Runoff
What are the goals of construction site stormwater runoff control?
Reduce pollutants in storm water runoff from construction activities disturbing one or more acres of land surface and those activities less than one acre that are part of a larger common plan of development.
Provide procedures for public input, sanctions to ensure compliance, requirements for construction site operators to implement appropriate erosion and sediment control practices, review of site plans which incorporates consideration of potential water quality impacts, and procedures for site inspection and enforcement of control measures.
Establish requirements for construction site operators to control waste such as discarded building materials, concrete truck washout, chemicals, litter, and sanitary waste.
How is construction site stormwater runoff controlled?
The permitting process requires the submission of a storm water pollution prevention plan (SWPPP) that the contractor will use to control site runoff. The plan includes best management practices (BMPs) that the contractor plans to utilize for containing all disturbed soil on site. The goal of the plan is to keep the sediment on site while allowing the storm water to leave.
Plan reviews are conducted to ensure they provide for adequate construction and post-construction storm water runoff pollution control.
Pre-construction meetings help to identify potential storm water runoff problem areas on the construction site and ensure they are addressed as part of the SWPPP.
During construction, the contractor is required to inspect the BMPs they use to prevent sediment laden water from leaving the construction site. The BMPs are also inspected by local construction inspectors and TDEC inspectors on a less frequent basis. All inspections are aimed at ensuring the BMPs will function properly when they are needed.
TDEC regulations and the City of Portland Storm Water Ordinance provides for enforcement of storm water requirements at construction sites when the BMPs of the contractor prove to be ineffective. However, the goal of enforcement action is not so much as to punish as to correct the deficiencies to prevent any future violations.
By working with developers, contractors and builders to ensure effective BMPs are in place, we all are helping to reduce or eliminate stormwater runoff pollution and to maintain our water quality.
Tennessee General NPDES Permit for discharges of Stormwater Associated with Construction Activities – PERMIT NO. TNR100000
MS4 Stormwater Design or BMP Manuals TDEC Erosion Prevention and Sediment Control Handbook
Tennessee Permanent Stormwater Management and Design Guidance Manual
Metro Nashville Stormwater Management Manual (BEST MANAGEMENT PRACTICES (BMP) MANUAL – Volume 4)
City of Portland Minimum Drainage Requirements