SLUDGE Attach 6_Permit Info.pdf

This is an Illinois Environmental Protection Agency Water Pollution Control Permit for land application of sewage sludge at Scott Air Force Base, effective September 27, 2024, through August 31, 2029.

The permit authorizes Scott Air Force Base - 375th Combat Logistics Support Squadron (WWTP) located at 701 Hangar Road, Scott Air Force Base, IL 62225, to apply approximately 300 dry tons per year of anaerobically digested sewage sludge to agricultural lands at rates not exceeding agronomic nitrogen demand of crop growth. The permit renews and replaces the previous permit (2020-SC-65005) and is subject to 14 special conditions covering sludge sampling and analysis requirements per Design Criteria for Sludge Application on Land, including testing for nutrients (total Kjeldahl nitrogen, ammonia nitrogen, phosphorus, potassium), metals (cadmium, copper, lead, manganese, nickel, zinc), and other parameters (pH, total solids, volatile solids, volatile acids). Semi-annual sludge management reports must be submitted to the Illinois Environmental Protection Agency by January 31 and July 31 of each year. Application guidelines restrict sludge use to sites with specific soil pH levels (6.5 or greater), slope limitations (8% or less without incorporation), maximum metal loading rates based on soil cation exchange capacity, and proximity restrictions to water wells, streams, and residences (minimum 100-foot setback). Additional restrictions prohibit application during precipitation, on saturated or snow-covered sites, within 90 to 7 days of application without landowner notice, and limit off-site storage of dried sludge to 2 months. Sludge users exceeding 300 acres or 1,500 dry tons per year must obtain additional user permits. Standard permit conditions require compliance with federal and state environmental laws, permitting of equipment operation, Agency access for inspection and sampling, and retention of agronomic calculations and sludge analyses for five years.