Silver Creek - Division of Water Quality - Utah.gov

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Silver Creek Watershed TMDL Final Report Table 6: Key STORET Locations Key Period of STORET Description Comments Station Record 492674 Silver Creek In Atkinson Yes 1996-2002 492675 Silver Creek In Wanship Ab. Weber R. Yes 1992-2002 492676 Silver Creek 2 Miles North of Atkinson No Prior to 1990 Not Sampled 1990-2002 492677 Silver Ck at I-80 No Prior to 1990 Not Sampled 1990-2002 492679 Silver Creek WWTP No 1998-2002 Not on Silver Creek 492680 Silver Creek Ab. Atkinson Yes 1998-2002 492685 Silver Creek Below Richardson Flats Yes 1992-2002 492695 Silver Creek Ab. Prospector Square Yes 1997-2002 492697 Park Meadow Drain Ck. Ab. Silver Creek No 1998-1999 Not on Silver Creek The USGS and USEPA sampling stations used for this report are summarized in Table 7. The original study station designations as well as nearby STORET locations (in parentheses in each header) are presented. Table 7: USGS, EPA Sampling Locations and Corresponding STORET Sites Above Atkinson ( 492680) USGS 2002 SCS-6000 Silver Creek Above Silver Creek WWTP Atkinson (492674) USGS 2000 Silver Creek At Atkinson USGS 2002 SCS-6500 Silver Creek At Atkinson (Below WWTP) Park City (492695) USEPA 2000 USC-8, State Sample Site USGS 2000 Silver Creek At Bonanza Dr. Richardson (492685) USEPA 2000 USC-1, Rail Tressel @ U248 USEPA 2000 USC-2, Culvert @ U248 USEPA 2000 USC-3, Upstream RR Tressel USGS 2000 Silver Creek Above Richardson Flats USGS 2002 SCS-5500 Silver Creek Below Richardson Flats - USGS 2002 Wanship (492675) USGS 2000 Silver Creek At Wanship USGS 2002 SCS-7000 Silver Creek @ Wanship Page 19
4.0 DATA ANALYSIS RESULTS 4.1 Zinc and Cadmium Standards Silver Creek Watershed TMDL Final Report Water quality standards for zinc and cadmium are discussed in Section 2.0. A review of the data shows 57% (131 of 230) of the zinc values included in the data set (Appendix A) exceed the hardness adjusted water quality standard of 0.39 mg/l. Similarly, 52% (117 of 226) of the cadmium values observed exceed the hardness adjusted water quality standard of 0.0008mg/l. 4.2 Water Quality and Flow Results by Location This section presents average concentrations and flows for each of the "key" sampling locations during each of the six bi-monthly periods. A summary of findings is provided followed by three figures showing bi-monthly zinc concentrations, bi-monthly cadmium concentrations, and bimonthly flow. Park City Zinc concentrations are lowest during the fourth period (July, August) and the highest during the first period (January, February). Water quality standards for zinc are exceeded during the first half of the year. Concentrations reach 1.5 times the standard. Flows are relatively low, and are greatest during the second and third periods (March through June). Cadmium concentrations are lowest in the fourth and fifth periods (July through October) and highest in the second period (March through April). Concentrations exceed the chronic standard throughout the year. Zinc Concentration (mg/l) 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 Park City (492695) Bi-Monthly Zinc Concentrations STORET Average (1990-2002) Overall Average STORET (1990-2002) USGS (2000) EPA (2000) Chronic Zn Standard (0.39) 0.0 Jan - Feb Mar - Apr May - Jun Jul - Aug Sep-Oct Nov - Dec 0 1 2 3 4 5 6 7 Bi-Monthly Period Figure 7: Park City Bi-Monthly Zinc Page 20
Page 1 and 2: Silver Creek Total Maximum Daily Lo
Page 3 and 4: Silver Creek Total Maximum Daily Lo
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Silver Creek Watershed TMDL Final R
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492685 SILVER CK AT US40 XING E OF
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492695 SILVER CK @ CITY PARK AB PRO
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Silver Creek - Division of Water Quality - Utah.gov

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