ln 1990, EPA began the National Pollutant Discharge Elimination System (NPDES) Permit process to address non-point sources of pollution. Phase I covered industrial sites and construction sites over 5 acres and municipalities over 100,000 (Tulsa and Oklahoma City).
Phase ii Regulations
ln 2003, EPA issued Phase ll regulations that require NPDES permits for stormwater discharges from certain small municipal separate storm sewer systems (MS4s) and construction activity generally disturbing between one and five acres (Jenks).
The MS4 permit for small communities became effective on February 8, 2005. All stormwater general permits require the permittee to complete, implement and maintain a Storm Water Pollution Prevention Plan (SWPPP). The SWPPP has to meet the requirements set forth in the general permit and must be tailored to meet the specific site's specifications and requirements.
Storm Water Management Plan
The initial Storm Water Management Plan for the City of Jenks was developed, and Authorization for Stormwater Discharge from Phase II Small Municipal Separate Storm Sewer System (MS4) was granted, effective December 8, 2005. In accordance with ODEQ General Permit OKR04 (November 1, 2015), the City's Authorization to Discharge was re-issued January 6, 2017 with an expiration date of October 31, 2020.