A Municipal Separate Storm Sewer System (MS4) is a system of conveyances that include catch basins, curbs, gutter, ditches, man-made channels, pipes, tunnels, or storm drains that are owned or operated by a federal, state, city, town, county, association, district, sanitary district, or other public body. Under the Clean Water Act, the EPA developed regulations to address stormwater that might impact water quality through design changes, public outreach and involvement and illicit discharge detection and elimination. These regulations are administered at a State level and in recent years have increased stormwater runoff and erosion control design requirements on projects. Understanding and complying with these regulations can be tricky, but Aulick Engineering team members have spent many years implementing these design requirements on projects in Georgia.
MS4 for Roadway Projects
It is important that engineers are familiar with these requirements and implement them during the concept design phase of any project, since these requirements can affect the layout and right of way required for a project. MS4 design, in areas where infeasibility and outfall exclusions do not apply, will typically include water quality, channel protection, overbank flood protection, and extreme flood protection. Many cities and counties have their own stormwater requirements, and others follow the requirements of the Georgia Stormwater Management Manual. The MS4 design for GDOT Road Projects must comply with GDOT NPDES Stormwater Permit No. GAR041000 and the GDOT Manual on Drainage Design for Highways. Aulick Engineering has almost 15 years of experience designing stormwater and applying this experience to roadway projects throughout the southeast. The stormwater engineers at Aulick are familiar with Chapter 10 – Post Construction Stormwater requirements and how to apply the BMPs, interpret project level & outfall level exclusions, and develop project stormwater features to minimize the affect of roadway development on downstream waters.
Industrial Stormwater Permitting
In compliance with the provisions of the Georgia Water Quality Control Act, the Federal Clean Water Act, and the Rules and Regulations of each of these Acts, all new and existing storm water point sources within the State of Georgia with industrial activity to the waters of the State of Georgia are required to apply for Industrial General Permit coverage. On June 1, 2012, the Georgia Environmental Protection Division (EPD) adopted General Permit No. GAR050000 for Storm Water Discharges Associated with Industrial Activity. Under the guidelines of this General Permit, dischargers of stormwater associated with industrial activity must prepare and implement a Stormwater Pollution Prevention Plans (SWPPP) in accordance with the minimum requirements listed in the General Permit. Aulick Engineering has prepared numerous SWPPP plans for MS4 compliance including preparing new plans for Airports to updating existing plans to meet the current Permit requirements.
MS4 Compliance and Design Project Experience
- Hood Avenue Widening – MS4 Compliance – City of Forest Park, Georgia
- SR120 Widening – MS4 Compliance, Drainage, and Erosion Control – Johns Creek, Georgia
- SWPPP Updates – Athens – Ben Epps Airport, DeKalb Peachtree Airport, Fulton County Airport, Russell Regional Airport
- Rockbridge Road Sidewalks – MS4 Compliance – Gwinnett County, Georgia
- Windsor Parkway Road Relocation – MS4 Compliance, Drainage, and Erosion Control – Sandy Springs, Georgia
- SR104/Riverwatch Parkway @ I-20 Corridor Improvements – MS4 Compliance – Augusta, Georgia