Silver Creek - Division of Water Quality - Utah.gov

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Silver Creek TMDL Executive Summary (Relevant Section of TMDL Report in Parentheses) I. Introduction (See Section 1.0 for details) Silver Creek Watershed TMDL Final Report Silver Creek Watershed - USGS Hydrologic Unit Code (HUC) #16020101 - Utah Waterbody ID # UT16020101-020 (see Figure 1) - Located entirely within Summit County Utah Listing & Priority: Silver Creek from the confluence with the Weber River to its headwaters is listed on Utah’s 1998, 2000, and 2002 303(d) list of impaired water bodies. This waterbody is included in the “high priority” group on Utah’s 303(d) list indicating a Total Maximum Daily Load (TMDL) should be completed at this time. Water quality impairments: Beneficial Uses Impaired: Zinc & Cadmium Class 3A – cold water species of game fish & aquatic life II. Water Quality Standards (See Section 2.0 for details) R317-2-14 provides the numeric water quality standards for zinc and cadmium. Standards for zinc and cadmium are based on hardness. Pursuant to 303 (d) listing methodology now used by Utah, the chronic water quality standards are used for this TMDL. Using a hardness of 400 mg/l, the chronic water quality standards for zinc and cadmium are 0.39 mg/l and 0.0008 mg/l respectively. III. Water Quality Standards Target (See Sections 2.0 & 3.0 for details) The hardness adjusted chronic water quality standards for zinc and cadmium will be used as the targets or endpoints for this TMDL. Pollutant of Concern Hardness Adjusted Chronic Water Quality Standard Target Zinc Cadmium 0.39 mg/l 0.0008 mg/l Page 3
Silver Creek Watershed TMDL Final Report IV. Significant Sources (See Section 6.0 for details) Historical evidence indicates the source of metals of concern in this watershed are from historical mining activities in the Park City area. Most of the mining activity occurred within the upper watershed, primarily within Empire Canyon. Tailings from these mines were stored onsite or removed to another location, typically downstream. Significant source areas for zinc and cadmium are identified on Figure 22 and summarized in the following table: Description Upper Watershed Sources Prospector Square Silver Maple Claims Flood Plain Tails Richardson Flats Meadow Area Owner United Park City Mines Park City Municipal Corporation BLM United Park City Mines United Park City Mines Various Private Land Owners V. Technical Analysis (See Section 7.0 for details) Data are presented in Section 4.0 showing average concentrations and flows for bi-monthly periods at each “key” sampling location. Table 7 presents a summary of flows, concentrations and loads at key stations for each of these bi-monthly periods. Sections 9.0 and 10.0 provide the Best Management Practices (BMPs) that can be used to remedy the widespread nonpoint sources of metals in the Silver Creek Watershed. Literature values for the effectiveness of each BMP are provided in Table 14. Utilizing the removal efficiencies for each BMP, reductions in zinc and cadmium loading values are calculated along with anticipated stream concentrations after BMP implementation. Completion of scheduled BMPs is expected to achieve and maintain the TMDL endpoints for Silver Creek. VI. Margin of Safety & Seasonality (See Sections 4.0 & 5.0) There is significant variability in the existing flow and chemical data set for this TMDL which lends uncertainty to the loading analysis. Additionally, there is uncertainty in the actual degree of success that implementation of the BMPs identified to address nonpoint sources will achieve. Accordingly, the Margin of Safety to address these sources of uncertainty for this TMDL will include the following components: • An explicit margin of safety of 25% is utilized in the allocation calculations for the Silver Creek TMDL • Ongoing Monitoring Program will be implemented • Use of the maximum hardness of 400 mg/l in calculating the hardness adjusted Water Quality Standards that are used as the endpoint for this TMDL (use of actual hardness would have resulted in higher values for the Water Quality Standards) Page 4
Page 1 and 2: Silver Creek Total Maximum Daily Lo
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Page 23 and 24: 4.0 DATA ANALYSIS RESULTS 4.1 Zinc
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Silver Creek Watershed TMDL Final R
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12.0 PUBLIC PARTICIPATION 12.1 Publ
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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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