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Uncompahgre Watershed Plan Tables 15-18

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Uncompahgre Watershed Plan Tables 15-18 UNCOMPAHGRE WATERSHED PLAN TABLES 15-18 UNCOMPAHGRE WATERSHED PLAN TABLES 15-19 UNCOMPAHGRE WATERSHED PLAN TABLES 15-20 UNCOMPAHGRE WATERSHED PLAN TABLES 15-21 UNCOMPAHGRE WATERSHED PLAN TABLES 15-22 UNCOMPAHGRE WATERSHED PLAN TABLES 15-23 UNCOMPAHGRE WATERSHED PLAN TABLES 15-24 UNCOMPAHGRE WATERSHED PLAN TABLES 15-25 UNCOMPAHGRE WATERSHED PLAN TABLES 15-26 UNCOMPAHGRE WATERSHED PLAN TABLES 15-27 UNCOMPAHGRE WATERSHED PLAN TABLES 15-28 UNCOMPAHGRE WATERSHED PLAN TABLES 15-29 UNCOMPAHGRE WATERSHED PLAN Table 7.2a. Uncompahgre River Basin Regulation #93 Colorado’s Section 303(d) List of Impaired Waters and Monitoring and Evaluation (Effective 3/2/2018). Impaired Segment Listed Portion 303(d) Parameters M&E Parameters Use(s) Uncompahgre River from the source Water Supply Manganese --- (Poughkeepsie Gulch) to a point COGUUN02 Aquatic Life pH --- immediately above confluence with Red Mountain Creek Aquatic Life --- Lead Water Supply Manganese --- Uncompahgre River: Red Mountain COGUUN03a Aquatic Life pH --- Creek to Cascade Creek Aquatic Life Zinc --- Uncompahgre River: Cascade Creek COGUUN03b Water Supply Manganese --- to Dexter Creek Uncompahgre River: Dexter Creek to COGUUN03c Water Supply Manganese Dallas Creek Uncompahgre River: outlet of COGUUN03e Aquatic Life Temperature --- Ridgway Reservoir to Broman Canyon Uncompahgre River: confluence with COGUUN03e Broman Canyon to outlet of South Aquatic Life Temperature --- Canal near Uncompahgre Water Supply Arsenic (total) --- Aquatic Life Iron (total) --- Uncompahgre River: Cedar Creek to COGUUN04a Aquatic Life --- Selenium Gunnison Rd. in Montrose Water Supply --- Sulfate Aquatic Life --- Sediment Uncompahgre River: Hwy 60 bridge in COGUUN4a Aquatic Life --- Sediment Montrose to Cedar Creek Water Supply Arsenic (total) --- Uncompahgre River: Gunnison Rd. in COGUUN4b Montrose to upstream boundary of Water Supply Manganese --- Confluence Park Aquatic Life --- Sediment Uncompahgre River: upstream COGUUN4c boundary of Confluence Park to Aquatic Life --- Sediment confluence with Gunnison River Aquatic Life --- Cadmium Aquatic Life --- Copper COGUUN05 Commodore Gulch and its tributaries Aquatic Life --- Lead Aquatic Life Zinc --- Aquatic Life Cadmium --- Aquatic Life Copper --- COGUUN05 Governor Basin Aquatic Life Lead --- Water Supply Manganese --- Aquatic Life Zinc --- TABLES 15-30 UNCOMPAHGRE WATERSHED PLAN Table 7.2a. CONTINUED: Regulation 93 (Effective 3/2/2018) Impaired Segment Listed Portion 303(d) Parameters M&E Parameters Use(s) COGUUN05 Silver Creek Aquatic Life --- Lead Aquatic Life Cadmium --- Aquatic Life Lead --- Sneffles Creek downstream of COGUUN05 Water Supply Manganese --- Governor Basin Aquatic Life Macroinvertebrates --- Aquatic Life Zinc --- Red Mountain Creek upstream of the Aquatic Life Silver --- COGUUN06a confleunce with the East Fork of Red Aquatic Life Mountain Creek Zinc --- Aquatic Life Copper --- Aquatic Life Lead --- COGUUN07 Grey Copper Gulch Aquatic Life pH --- Aquatic Life Zinc --- Aquatic Life Cadmium --- COGUUN08 Mineral Creek Aquatic Life Copper --- Aquatic Life Zinc --- Aquatic Life Cadmium --- Lower Sneffels Creek, within 1.5 miles Aquatic Life Lead --- COGUUN09 from confluence with Imogene Creek, Aquatic Life and all tributaries --- Macroinvertebrates Aquatic Life Zinc --- COGUUN09 Canyon Creek Aquatic Life Zinc --- Aquatic Life Cadmium --- COGUUN09 Imogene Creek Aquatic Life Copper --- Aquatic Life Zinc --- COGUUN10a Alkali Creek and all tributaries Aquatic Life --- Selenium Cow Creek from confluence with COGUUN10a Water Supply Arsenic (total) --- Nate Creek to Uncompahgre River Macroinvertebrates Aquatic Life --- COGUUN11 Deer Creek from source to Cow Creek (provisional) Water Supply Arsenic (total) --- Cow Creek: all tributaries and COGUUN11 wilderness to Nate Creek Water Supply Arsenic (total) --- Water Supply Arsenic (total) COGUUN11 Dallas Creek Aquatic Life --- Temperature Water Supply Arsenic (total) --- COGUUN11 Billy Creek Aquatic Life --- Iron (total) Coal, Pleasant Valley, and Boaton COGUUN11 Water Supply Arsenic (total) --- Creeks TABLES 15-31 UNCOMPAHGRE WATERSHED PLAN Table 7.2a. CONTINUED: Regulation 93 (Effective 3/2/2018) Impaired Segment Listed Portion 303(d) Parameters M&E Parameters Use(s) COGUUN11 Onion Creek and its tributaries Water Supply Arsenic (total) --- Dry Creek: Coalbank Canyon Creek to COGUUN12 Uncompahgre River Aquatic Life Iron (total) --- Loutzenhizer Arroyo and its COGUUN12 tributaries Aquatic Life Iron (total) --- Dry Creek: confluence of East & West COGUUN15b Forks to Coalbank Canyon Creek Aquatic Life --- Sediment Aquatic Life --- Lead COGUUN19 Ridgway Reservoir Aquatic Life --- Zinc Sweitzer Lake (a.k.a. Garnet Mesa COGUUN20 Aquatic Life Selenium --- Reservoir) The 303(d) and M&E List is revised every two years. The next revision will be completed during the Regulation 93 hearing that will begin during the fall of 2020. The WQCC maintains a long-term schedule at: https://www.colorado.gov/pacific/cdphe/wqcc-meetings The most current version of the 303(d) and M&E List, also known as Regulation 93, is available at: https://www.colorado.gov/pacific/cdphe/water-quality-control-commission- regulations TABLES 15-32 UNCOMPAHGRE WATERSHED PLAN Table 7.2b. Uncompahgre River Basin approved TMDLs. WBID Segment Description TMDL Approved (Date) Mainstem of the Uncompahgre River from the source at Como Lake (Poughkeepsie Gulch) to COGUUN02 Cd, Cu, Zn (2010) a point immediately above the confluence with Red Mountain Creek Mainstem of the Uncompahgre River from a point immediately above the confluence with COGUUN03A Cd, Cu, Fe(Trec) (2010) Red Mountain Creek to the Highway 90 bridge at Montrose Mainstem of the Uncompahgre River from La Salle COGUUN4B Road to Confluence Park Se (2011) Mainstem of the Uncompahgre River from COGUUN4C Confluence Park to Gunnison River Se (2011) Mainstem of Red Mountain Creek, from the source to COGUUN06A immediately above the confluence with East Fork Zn (2010) Red Mountain Creek All tributaries to the Uncompahgre River, including all wetlands, from the South Canal near Uncompahgre COGUUN12 to the confluence with the Gunnison River, except for Se (2011) specific listings in Segments 13, 14, 15a and 15b. TABLES 15-33 UNCOMPAHGRE WATERSHED PLAN Table 7.2c. Stream segments in the Upper Uncompahgre Watershed that are proposed for 303(d) listing in 2018 and considered for TMDL development in 2020 (Table was prepared in October 2017). TABLES 15-34 UNCOMPAHGRE WATERSHED PLAN Table 7.3. WLA for Historic Mining Sources WBID Metal % of allowable load attributed to historic mining Cadmium 23% Segment 2 Copper 44% Zinc 73% Cadmium 17% Segment 3a Copper 3% Iron 43% Segment 6a Zinc n/a Source: Red Mountain Creek TMDL Assessment (WQCD, 2009) WBID based on Table 7.2a Table 7.4. Target Annual Selenium Load Reduction (lbs/yr) Average Average Average Mean WBID Site Names Load Percent Load Annual Reduction Reduction Load Dry Cedar Creek 270 250 93 Cedar Creek near Mouth 1,980 1,730 87 12 Loutzenhizer Arroyo at N. River 5,200 5,070 98 Road Dry Creek at Mouth, near Delta 1,230 653 53 4b Uncompahgre River at Delta 5,420 3,730 69 Source: USGS Selenium Report (Thomas et al., 2008) WBID based on Table 7.2a Table 7.5. Selenium Concentrations and Loads to Sweitzer Lake 85th Percentile Source Annual Load Load Reduction Concentration Garnet Canal Diversion 17.2 ug/L 48.9 lbs 35.9 lbs (73%) Diversion Drain 7.65 ug/L 18.4 lbs 7.32 lbs (40%) Groundwater flux 19.7 – 198 ug/L 1.17-88.3 lbs 0.009 – 86.3 lbs Source: USGS Sweitzer Lake Study (Thomas, 2009) TABLES 15-35 UNCOMPAHGRE WATERSHED PLAN Table 7.6. Seasonal Conductivity (µS/cm) levels in the Uncompahgre River Location High Water Irrigation Flow Base Flow Ouray 235 395 625 Ridgway 420 565 680 Delta 1,070 1,150 1,530 Source: adapted from Tuttle and Grauch, 2009 Table 7.7. Tri-County Water Quality Assessment of Ridgway Reservoir Parameter Sample Location Description Uncompahgre River River samples generally above MCL and stream standards, Iron Reservoir Outlet Reservoir Outlet had high July concentration Uncompahgre River Extremely high levels in the river, Aluminum Reservoir Surface several exceedances of secondary MCL in reservoir Reservoir Outlet Samples generally exceeded MCL, always below chronic Manganese Uncompahgre River stream standard All samples were below the MCL. The Reservoir Surface and Reservoir Outlet samples exceeded the acute stream standard Uncompahgre River in April, but were below the chronic stream standard for all Cadmium Reservoir Surface other samples. The River sample was always below the acute Reservoir Outlet stream standard, but exceeded the chronic stream standard for April through June. The final two River samples (July and August) were below the chronic stream standard. Dissolved and Uncompahgre River Most samples above 2.0 mg/l, the level generally considered Total Organic Reservoir Surface low organic water Carbon All samples above chronic and acute standards, all samples Copper Uncompahgre River below MCL All Reservoir Surface and Reservoir Outlet samples below MCL. River samples were below the acute stream standard for all samples, but at or above the chronic stream standard for Uncompahgre River April through July. Reservoir Surface samples were above the Lead Reservoir Surface chronic stream standard for April through June, but were Reservoir Outlet below the standard in July and August. The Reservoir Outlet sample was above the chronic stream standard in April, but below the standard for all other months. Alkalinity Uncompahgre
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