Who needs a SWPPP?

Any construction or demolition activity, including, but not limited to, clearing, grading, grubbing, or excavation, or any other activity that results in a land disturbance of equal to or greater than one acre needs a Stormwater Pollution Prevention Plan or SWPPP.

Construction activity that results in land surface disturbances of less than one acre if the construction activity is part of a larger common plan of development or the sale of one or more acres of disturbed land surface.

Construction activity related to residential, commercial, or industrial development on lands currently used for agriculture including.

Sampling, Monitoring, Reporting and Record-Keeping

Visual monitoring of storm water and non-storm water discharges is required for all sites subject to this Construction General Permit.

Records of all visual monitoring inspections are required to remain on-site during the construction period and for a minimum of three years.

If run-on is caused by a forest fire or any other natural disaster, then receiving water monitoring triggers do not apply.

For Risk Level 3 sites larger than 30 acres and with direct discharges to receiving waters, the Construction General Permit requires bioassessment sampling before and after site completion to determine if significant degradation to the receiving water’s biota has occurred. Bioassessment sampling guidelines are contained in this Construction General Permit.

A summary and evaluation of the sampling and analysis results will be submitted in the Annual Reports.

The Construction General Permit contains sampling, analysis and monitoring requirements for non-visible pollutants at all sites subject to this Construction General Permit.

The Construction General Permit requires that all dischargers maintain a paper or electronic copy of all required records for three years from the date generated or date submitted, whichever is last.  These records must be available at the construction site until construction is completed.

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