Silver Creek - Division of Water Quality - Utah.gov

Silver Creek Watershed TMDL Final Report
Seasonal analysis of the data is described in section 4.0. Statistical analysis determined that
bimonthly partitioning of the data best reflects the seasonal nature of the data.
VII. TMDL
(See Section 8.0 for details)
Table 12 provides the zinc and cadmium allocations for each key monitoring station in the Silver
Creek Watershed. The reduction needed for each of the key stations varies from 48% to 86% for
zinc and 31% to 92% for cadmium.
VIII. Allocation
(See Section 8.0 for details)
Section 8.0 and Table 12 include the allocation for zinc and cadmium between non-point
sources, the one point source in the watershed and the margin of safety.
Waste Load Allocation calculations are included in Section 8.0 for the Silver Creek Water
Reclamation Facility. Effluent limits for zinc (0.30 mg/l) and cadmium (0.0008 mg/l) are
proposed to assure that the hardness adjusted chronic water quality standards used as endpoints
for this TMDL are met in the stream after mixing with wastewater effluent. These effluent limits
will not be required until significant progress is made on the non-point source pollution problems
in the Silver Creek Watershed.
IX. Public Participation
(See Section 12.0 for details)
Section 12.0 provides the description of the rather extensive public involvement and
participation for this TMDL. The Upper Silver Creek Watershed Stakeholders Group has held
regular meetings since March 20, 2001. Several public meetings have been held to allow for
public input and comment on this TMDL. A formal 30 day comment period was also provided
for public comment on the draft TMDL.
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