Illinois Environmental Protection Agency Charleston Side Channel Reservoir TMDL
Table 10. NPDES Facilities in the Embarras River Watershed Upstream of the Charleston Side
Channel Reservoir and Their Estimated Annual Discharge of Phosphorus (March 1998 to March
2002).
NPDES
Permit No. Facility Name City County Description
Receiving
Stream
Average
Flow
Rate
(mgd)
TP
(kg/yr)
IL0059005
Villa Grove
Sewage
Treatment Plant
Villa Grove Douglas Sewage
Treatment Plant
Embarras River
To Wabash River 0.3325 360
IL0027499 Arcola Sewage
Treatment Plant Arcola Douglas Sewage
Treatment Plant
Unnamed Trib To
Scattering Fork 0.4431 2,448
IL0071617 Tuscola Sewage
Treatment Plant Tuscola Douglas Sewage
Treatment Plant Hayes Branch 0.8208 4,536
IL0031453 Tolono Sewage
Treatment Plant Tolono Champaign Sewage
Treatment Plant Hackett Branch 0.1169 646
IL0055450 Newman Sewage
Treatment Plant Newman Douglas Sewage
Treatment Plant Embarras River 0.1220 674
IL0004375 Cabot Corporation Tuscola Douglas Manufacturing Scattering Fork
Creek 0.0704 389
IL0066532
Hydromet
Environmental
(USA)
Newman Douglas Sewage
Treatment Plant Brushy Creek 0.0004 2
IL0042757
Shiloh County
Community
School
Hume Edgar School Brushy Fork 0.0042 23
IL0055212 Unity High School Tolono Champaign School Embarras River 0.0012 7
IL0060119 Parkview Mobile
Home Park Tuscola Douglas Mobile Home
Park Scattering Fork 0.0100 55
IL0066974 Boxwood Health
Care Center Newman Douglas Health Services Trib To Embarras
River 0.0087 48
IL0034916 Rogers Mobile
Home Park Charleston Coles Mobile Home
Park
Unnamed Trib To
Embarras River 0.0059 33
Total 1.9361 9,221
For each subbasin, SWAT produces reports that describe the total annual transport by runoff of sediment
and associated pollutants into the subbasin stream reach from certain combinations of land use and soil
type. Subbasin 7 generates the largest annual average loadings of TP, while Subbasins 13 and 14
contribute the second and third largest pollutant loadings. The large TP delivery from Subbasins 7, 13,
and 14 is related to their large size and the dominance of corn/soybean agricultural activities within each
subbasin.
The SWAT model does not include a component to estimate TP loads from septic systems. These loads
were therefore estimated using the watershed population and assumptions for the performance of the
systems (properly functioning systems should contribute very little TP because it will be adsorbed to the
soil). Data from the 2000 U.S. Census indicate that the non-urban population of the watershed is
approximately 14,000. Assuming that this entire population is served by septic systems with a per capita
24 Source Assessment
