Silver Creek - Division of Water Quality - Utah.gov
Silver Creek - Division of Water Quality - Utah.gov
Silver Creek - Division of Water Quality - Utah.gov
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<strong>Silver</strong> <strong>Creek</strong> <strong>Water</strong>shed TMDL Final Report<br />
Richardson<br />
Zinc concentrations were found to be highest during the Winter and early Spring (Nov. through<br />
April) and lowest during the Summer and Fall months. On average, water quality standards for<br />
zinc are exceeded throughout the year, with concentrations reaching two times the standard.<br />
Flows peak in the third and fourth periods (from March to June).<br />
Cadmium concentrations are highest in the second period (March through April). Chronic water<br />
quality standards are typically exceeded most <strong>of</strong> the year.<br />
Zinc Concentration (mg/l)<br />
3.0<br />
2.5<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
Richardson (492685)<br />
Bi-Monthly Zinc Concentrations<br />
STORET Average (1990-2002)<br />
Overall Average<br />
STORET Samples (1990-2002)<br />
USGS (2000)<br />
EPA (2000)<br />
USGS (2002)<br />
Chronic Zn Standard (0.39)<br />
0.0<br />
0 Jan 1 - Feb Mar 2- Apr<br />
May 3 - Jun<br />
Jul 4- Aug Sep-Oct 5 Nov 6 - Dec<br />
7<br />
Bi-Monthly Period<br />
Figure 10: Richardson Bi-Monthly Zinc<br />
Page 22
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