2020-09-15_HYDROLOGY - M1977300 (2)

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COLORADO LEGACY LAND TABLE 113: SUMMARY OF SURFACE WATER ANALYTICAL DATA Surface Water Quality Standards Sample Location Segment 17b,Ralston Creek Parameter Units CDPHE 2019)' SW-ARH SW-BPL SW-FBRG SW-LLHG SW-Weir SW-AWD SW-NWRP Acute Chronic 6/3/2020 6/3/2020 6/3/2020 6/3/2020 6/3/2020 6/2/2020 6/2/2020 Iron my L 1 0.22 0.21 0.22 0.49 0.30 0.27 0.26 Lead m L 0.05 - 0.0001 <0.0001 <0.0001 0.0003 0.0002 0.0001 0.0001 Manganese m L 0.05 - 0.02 0.02 0.02 0.09 0.04 0.02 0.02 Mercury m L 3.513 1.941 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 Molybdenum m L - 0.15 0.0012 0.0007 0.0008 0.0015 0.0021 0.0005 0.0007 Silver m L 0.0047 0.00017 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 Thallium m L - - <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 Uranium m L - - 0.0083 0.0073 0.0077 0.0093 0.0090 0.0013 0.0028 Zinc 0.249 0.188 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 Radionuclides Gross Alpha Ci L - - 6.0 7.8 8.7 7.2 5.6 3.5 2.9 Gross Beta Ci L - - 6.6 5.9 2.9 4.0 4.6 5.5 2.9 Radium 226- Dissolved Ci L - - 0.41 0.26 0.53 0.55 0.31 0.24 0.72 Radium 226-Total Ci L - - 0.44 0.38 0.19 0.67 0.53 0.32 0.26 Radium 228-Total Ci L - - 0.61 0.73 0.73 0.68 0.0 0.81 0.5 Radium 226+ Radium 228-Total Ci L - - 0.44 0.38 0.19 0.67 0.53 0.32 0.26 Notes: 1 Acute and chronic standards for cadmium,chromium III,copper,lead,manganese,nickel,silver,uranium and zinc are calculated using an average hardness value of 163 mg/L as CaCO3. Bold and grey-shaded analytical results are greater than one or more criteria. NO3=Nitrate NO2=Nitrite CaCO3=Calcium Carbonate mg/L=milligrams per Liter pCi/L=picocuries per Liter Chromium III=Trivalent Chromium Chromium IV=Tetravalent Chromium Source: CDPHE. 2019. Regulation No.38 Stream Classification and Water Quality Standards,Clear Creek Basin,Segment 17b.Mainstem of Ralston Creek Including all Tributaries and Wetlands from the Source to the Inlet of Arvada Reservoir.June PAGE 6 OF 12