ALPHARETTA, GA. — Mactec was retained by Lexington County, S.C., to enhance the county’s stormwater management program. The key services will be to ensure compliance with the county’s National Pollutant Discharge Elimination System (NPDES) phase II permit which includes:

• watershed planning services to identify solutions to problems related to both water quality and flooding;
• consolidate GIS and database stormwater inventory data collected by the county, seven other NPDES Phase II Program permit holders, and assess the value of the data;
• use GIS screening to identify potential “hot spots” for pollutant loads or illicit discharges, which will save the county time and effort as it implements a sampling/monitoring program;
• identify and potentially implement an alternative funding option to support the stormwater management program;
• aid the county is pursuing grant funding opportunities;
• review and identify ways to improve the format and presentation of the Land Development Manual;
• support the county’s annual stormwater reporting to the South Carolina Department of Health and Environmental Control (SCDHEC) as well as reviewing and negotiating terms and conditions of the NPDES permit with the SCDHEC;
• perform analyses to support development of new TMDLs and/or validation of the current TMDLs, and in some cases to avoid new TMDLs by delisting impaired streams currently included on the state’s 303(d) List of Impaired Waters; and
• update the county’s Illicit Discharge Detection and Elimination (IDDE) manual.