Silver Creek - Division of Water Quality - Utah.gov

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Silver Creek Watershed TMDL Final Report Richardson (492685) Bi-Monthly Cadmium Concentrations Cadmium Concentration (mg/l) 0.020 0.018 0.016 0.014 0.012 0.010 0.008 0.006 0.004 STORET Average(1990-2002) Overall Average STORET (1990-2002) USGS (2000) EPA (2000) Chronic Cd Standard (0.0008) 0.002 0.000 0 Jan - 1 Feb Mar - 2Apr May 3- Jun Jul 4- Aug Sep-Oct 5 Nov 6 - Dec 7 Bi-Monthly Period Figure 11: Richardson Bi-Monthly Cadmium 25 20 Richardson (492685) Bi-Monthly Flow STORET Average (1990-2002) Overall Average STORET Samples (1990-2002) EPA (2000) USGS (2002) Flow (cfs) 15 10 5 0 0 Jan 1 - Feb Mar - 2Apr May 3- Jun Jul 4- Aug Sep-Oct 5 Nov - 6 Dec 7 Bi-Monthly Period Figure 12: Richardson Bi-Monthly Flow Page 23
Silver Creek Watershed TMDL Final Report Above Atkinson Zinc concentrations are highest during the Winter months (Nov. through Feb.) and lowest during late Summer and Fall (Sept. through Oct.). Water quality standards for zinc are exceeded for most of the year. Zinc concentrations reach up to six times the chronic standard. Flow fluctuates during the year with the highest flows during late Winter and early Summer. During the irrigation season, a significant flow is typically diverted into the Pace Family Irrigation Diversion. This diversion takes water from Silver Creek just below Richardson Flat and returns between the Atkinson and Above Atkinson water quality sampling stations. Cadmium concentrations are the highest during the Winter months (November through February). Late Summer and early Autumn months (July through October) have never had values above the detection limit. Chronic water quality standards are typically exceeded during the rest of the year. Above Atkinson (492680) Bi-Monthly Zinc Concentrations Zinc Concentration (mg/l) 8.0 7.0 6.0 5.0 4.0 3.0 2.0 STORET Average (1990-2002) Overall Average STORET Samples (1990-2002) USGS (2002) Chronic Zn Standard (0.39) 1.0 0.0 0 Jan 1 - Feb Mar - Apr 2 May 3- Jun Jul - Aug Sep-Oct Nov - Dec 4 5 6 7 Bi-Monthly Period Figure 13: Above Atkinson Bi-Monthly Zinc Page 24
Page 1 and 2: Silver Creek Total Maximum Daily Lo
Page 3 and 4: Silver Creek Total Maximum Daily Lo
Page 5 and 6: Silver Creek Watershed TMDL Final R
Page 23 and 24: 4.0 DATA ANALYSIS RESULTS 4.1 Zinc
Page 25: Silver Creek Watershed TMDL Final R
Page 55 and 56: N/A: Not Applicable Silver Creek Wa
Page 65 and 66: 12.0 PUBLIC PARTICIPATION 12.1 Publ
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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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