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samplings at two Commission stations on the Sauk Creek main stem.   The sampling
station locations are shown on Map XIV-4.
No known post-1976 water quality data were available from the Sauk Creek water-
shed.   The assessment of current conditions relied upon the uniform areawide
characterization of surface water conditions developed under the initial plan-
ning effort by simulation modeling.    The modeling results developed under the
initial plan included simulation of water quality conditions under various
levels of point source and nonpoint source pollution control and under both the
then current 1975 land use conditions and under planned year 2000 land use
conditions.   Review of this data can provide insight into the current water
quality conditions and the current potential for achieving the established water
use objectives in the Sauk Creek watershed.
Toxic and Hazardous Substances:     No known stream water or bottom sediment
sampling for toxic and hazardous materials in the form of heavy metals,
polychlorinated biphenyls (PCB's), or pesticides have been conducted within the
Sauk Creek watershed.
Since the completion of the initial regional water quality management plan, five
spills of toxic substances into streams within the Sauk Creek watershed have
been documented by the Wisconsin Department of Natural Resources. All of these
spills have occurred in the main stem of Sauk Creek in the City of Port Washing-
ton. The majority of the substances that were spilled into the creek were oil.          I
Water Quality Assessments: Based upon the available data, the water quality and
biological characteristics of Sauk Creek were assessed with the results set
forth in Table XIV-7.   Fish population and diversity is fair.    Problems with
levels of fecal coliform are estimated to exceed standards in Sauk Creek. Dis-
solved oxygen, phosphorus, and un-ionzed ammonia nitrogen levels are estimated
to meet the standards. No recent data were available on toxic pollutants or on
the biotic index ratings, which are biological indicators of water quality
within a stream system.    High levels of streambed sedimentation were noted
throughout the watershed.
Table XIV-8 sets forth water quality index classifications2 used in the initial
plan for 1964, 1974-75, and for 1990-91 conditions for selected sampling sta-
tions in the watershed. The use of the index is discussed in Chapter II. As
indicated in Table XIV-8, no recent comparative data were available.
A summary of potential pollution sources in the Sauk Creek watershed by stream
reach is shown in Table XIV-9.     Review of the data indicate that a limited
number of spills of toxic substances have occurred in the watershed, and six
industrial discharges have been permitted to discharge to Sauk Creek.  It should
be noted that all of the spills and discharges have discharged to the portion of
Sauk Creek located within the City of Port Washington. Data on nonpoint source
pollution is also included in Table XIV-8.

2For a detailed description of the water quality index, see SEWRPC Technical
Report No. 17, Water Quality of Lakes and Streams in Southeastern Wisconsin:
1964-1975, June 1978.-3
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