Quarterly Report 2 (October-December 2001): West Branch DuPage River Watershed

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Quarterly Report 2 (October–December 2001)
West Branch DuPage River Watershed
Introduction
This is the second quarterly report for the West Branch DuPage River Watershed Total
Maximum Daily Load (TMDL) project. This quarterly report provides a brief description of
project progress during the quarter and the proposed TMDL endpoints for each
impairment.
A summary of TMDL endpoints is shown in Table 1.
TABLE 1
Applicable Numeric Water Quality Standards and Guidelines to be Used as TMDL Endpoints.
Parameter STORET # Water Quality Standard 305(b) Listing Guideline TMDL Endpoints
Copper
(dissolved), μg/L
as C
01042 Acute: Exp[A+Bln(H)], where
A=-1.464, and B=0.9422
H=hardness
Chronic: exp[A+Bln(H)], where
A=-1.465, and B=0.8545
N/A Use chronic standard;
dependent on water
hardness (H)
Chloride 00940 500 mg/L N/A WQSa
Total Dissolved
Solids (TDS)
70304 1,000 mg/L Water quality
standard
Relationship with
conductivity (1,000
mg/L is equivalent to
1,667 micro-mho/cm)
Nitrate as N 00620 None 7.8 mg/L Use 305(b) guideline
Nitrogen 00610 / 00612 None Ammonia-N 0.41 mg/L Use 305(b) guideline
Phosphorus 00665 None Streams – 0.61 mg/L Use 305(b) guideline
Suspended Solids None 116 mg/L 305(b) guideline
Habitat Alterations None Qualitative guideline Not defined. A
narrative approach will
be used.
Flow Alterations None Qualitative guideline Not defined. A
narrative approach will
be used.
a WQS = water quality standard.
Recent Project Activities
The objectives of the work performed in the second quarter of the West Branch DuPage
River Watershed TMDL project were to prepare data for hydrologic calibration and water
quality calibration. Activities conducted to accomplish these objectives included data
processing and further data assessment for creation of model input files.