Quarterly Report 1: Dutchman Creek Watershed

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Quarterly Report 1
Dutchman Creek Watershed
Introduction
This is first in a series of quarterly reports to provide an update of Total Maximum Daily
Load (TMDL) development in the Dutchman Creek Watershed. The Illinois
Environmental Protection Agency (IEPA) is responsible for TMDL development and has
contracted with Camp Dresser & McKee (CDM) to complete TMDLs within this
watershed. IEPA plans to complete the TMDLs for this watershed within the next 14
months. This quarterly report provides a brief description of what a TMDL is, the
waterbodies that are scheduled for TMDL development, the standards and targets the
TMDLs will aim to meet, public participation opportunities, project progress, and the
next steps of the process to complete.
TMDL Overview for Dutchman Creek Watershed
A TMDL is a calculation of the maximum amount of a pollutant that a water body can
receive and still meet water quality standards. TMDLs are a requirement of Section
303(d) of the Clean Water Act (CWA). To meet this requirement, IEPA must identify
water bodies not meeting water quality standards and then establish TMDLs for
restoration of water quality. IEPA lists water bodies not meeting water quality standards
every two years. This list is called the 303(d) list and water bodies on the list are then
targeted for TMDL development.
The TMDL goals and objectives for the Dutchman Creek Watershed include developing
TMDLs for all impaired water bodies within the watershed, describing all of the
necessary elements of the TMDL, developing an implementation plan for each TMDL,
and gaining public acceptance of the process. Following are the impaired water body
segments in the Dutchman Creek Watershed, which are also shown in Figure 1-1:
Impaired Water Bodies in Dutchman Creek Watershed
Water Body
Segment ID
Water Body
Name Size Potential Causes of Impairment
RAM Dutchman Lake 118 acres Nitrogen, siltation, dissolved oxygen (DO), total
suspended solids (TSS), noxious aquatic plants,
excessive algal growth/chlorophyll "a"
ADD02 Dutchman Creek 14.8 miles DO, flow alteration, other habitat alterations
ADD01 Dutchman Creek 4.99 miles Phosphorus, nitrogen
The TMDL for each of the segments listed above will specify the following elements:
n Loading Capacity (LC) or the maximum amount of pollutant loading a water body
can receive without violating water quality standards
n Wasteload Allocation (WLA) or the portion of the TMDL allocated to existing or
future point sources