Section 5
Cahokia Canal Watershed Characterization
5-8 FINAL
examined by receiving water and then by the downstream impaired segment that has
the potential to receive the discharge. Receiving waters were determined through
information contained in the USEPA Permit Compliance System (PCS) database.
Maps were used to determine downstream impaired receiving water information when
PCS data were not available. Many of the point sources in this watershed discharge
directly to the Mississippi River. These point sources have not been used for watershed
assessment. The impairments for each segment or downstream segment were
considered when reviewing DMR data. Data has been summarized for any sampled
parameter that is associated with a downstream impairment (i.e., all available nutrient
and biological oxygen demand data was reviewed for segments that are impaired for
dissolved oxygen). This will help in future model selection as well as source
assessment and load allocation.
5.3.1.1 Cahokia Canal Segment JN 02
There are seven point sources with the potential to contribute discharge to Cahokia
Canal Segment JN 02. Segment JN 02 is listed as impaired for dissolved oxygen.
Table 5-13 contains a summary of available and pertinent DMR data for these point
sources. Dissolved oxygen data is not required by all permits and was available for
only three point sources.
Table 5-13 Effluent Data from Point Sources Discharging Upstream of or Directly to Cahokia Canal
Segment JN 02 (Illinois EPA 2005)
Facility Name
Period of Record
Permit Number
Receiving Water/
Downstream Impaired
Waterbody Constituent
Average
Value
Average
Loading
(lb/d)
Elementis Pigments,
Inc.
1995-2005
IL0038709
Schoenberger
Creek/Cahokia Canal
Segment JN 02
Average Daily Flow 0.655 mgd NA
Nitrogen, Ammonia 1.12 mg/L 5.64
General Chemical LLC
2003-2004
IL0000647
Rose Creek/Cahokia
Canal Segment JN 02
Average Daily Flow 0.0037 mgd NA
Dot-Dist 8 Bowman
Ave Pump Station
1997-2005
IL0070955
Cahokia Canal/Cahokia
Canal Segment JN 02
Average Daily Flow 19 mgd NA
Nitrogen, Ammonia 0.722 mg/L 83.1
Maryville WTP
1996-2003
ILG640139
NA/Cahokia Canal
Segment JN 02
Average Daily Flow 0.01 mgd NA
Stone Meadows MHP
1994-2004
IL0046914
Cahokia Canal/Cahokia
Canal Segment JN 02
Average Daily Flow 0.07 mgd NA
BOD, 5-Day 157.9 mg/L
CBOD, 5-Day 5.58 mg/L 2.05
Oxygen, Dissolved 7.2 mg/L
Nitrogen, Ammonia 1.23 mg/L 0.36
Wheel Ranch MHP-Collinsville
1996-2003
IL0044598
NA/Cahokia Canal
Segment JN 02
Average Daily Flow 0.015 mgd NA
BOD, 5-Day 431.8 mg/L –
CBOD, 5-Day 6.22 mg/L 0.258
Nitrogen, Ammonia 2.94 mg/L 0.122
Holiday MHP
1995-2004
IL0038288
Unnamed Tributary to
Cahokia Canal/Cahokia
Canal Segment JN 02
Average Daily Flow 0.05 mgd NA
BOD, 5-Day 181.4 mg/L 71.9
CBOD, 5-Day 7.01 mg/L 1.99
Nitrogen, Ammonia 2.69 mg/L 0.39
