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Show Salt Lake City Watershed Management Plan ' 99 Table 2 Heavy Metals Metal Health Concern Lead ( Pb) Brain damage, Birth defects Mercury ( Hg) Central nervous system damage, Birth defects Silver ( Ag) Dis- coloration of skin and eyes Heavy metals are classified as priority pollutants, meaning they are hazardous to human health at elevated levels. Even though they may be required in small quantities to support life, larger quantities may be toxic. Sources of heavy metals in canyon streams include: natural groundwater flow through rock formations, mine tunnel discharges, vehicle fluid leakage ( crank case oil, anti- freeze, etc.), and surface runoff from mining affected areas. WATER QUALITY DATA INVENTORY Water quality data was obtained from various sources including: Salt Lake City Public Utilities and Utah State Department of Environmental Quality. Available water quality data includes coliform bacteria; water chemistry data such as nutrients and turbidity, dissolved metals, pH, temperature, and dissolved oxygen; and creek flow data. COLIFORM BACTERIA Coliform data ( reported as colonies per 100 milliliters) is available from two different sources: 1) total coliform data collected at the intakes to the treatment plants ( City Creek, Parleys, Big Cottonwood, and Little Cottonwood), and 2) total coliform and fecal coliform data collected as part of the watershed monitoring program. Treatment plant intake locations and watershed water quality monitoring locations are shown on the Hydrologic Features and Constraints Map found on page 27. WATER TREATMENT PLANT INTAKE COLIFORM DATA Mean monthly coliform data was provided by the City for the treatment plant intakes ( see Appendix J for the periods summarized in Table 3). Page 17 |