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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)1 SW-ARH SW-BPL SW-LLHG SW-Weir SW-NWRP SW-FBRG Acute Chronic 7/22/2020 7/22/2020 7/22/2020 7/22/2020 7/22/2020 7/28/2020 Copper mg/L 0.0213 0.0136 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 Iron m L - 1 0.13 0.12 0.32 0.31 0.53 <0.06 Lead m L 0.05 - <0.0001 <0.0001 0.0002 <0.0001 <0.0001 <0.0001 Manganese m L 0.05 - 0.03 0.01 0.06 0.12 0.13 <0.01 Mercury m L 3.513 1.941 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 Molybdenum m L - 0.15 0.0067 0.0016 0.0095 0.0092 0.014 0.0018 Silver m L 0.0047 0.00017 <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 Uranium m L - - 0.0268 0.0251 0.0257 0.0177 0.0139 0.026 Zinc m L 0.249 0.188 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 Radionuclides Gross Alpha Ci L - - 24 19 19 8.5 76 15.0 Gross Beta Ci L - - 9.5 16 11 10 29 9.1 Radium 226-Dissolved Ci L - - 0.45 0.39 0.29 0.58 0.43 0.45 Radium 226-Total Ci L - - 0.42 0.36 0.45 0.65 0.5 0.46 Radium 228-Total I pCi/L - - 0.67 0.07 0.34 -0.86 1.1 0.12 Radium 226+ Radium 228-Total I pCi/L - - 0.42 0.36 0.45 0.65 0.5 0.46 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