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COLORADO LEGACY LAND TABLE 2B:SUMMARY OF SURFACE WATER ANALYTICAL DATA Surface Water Quality Standards Sample Location Parameter Units Segment 17b,Ralston Creek (CDPHE2019)1 SWARH SW-AWD SWBPL SW-FBRG SW-LLHG �SW-NWR�P SW-Weir Acute Chronic 06/03/2021 06/15/2021 06/03/2021 Zinc + u;:it; n.r,z 0.021 B <0.02 <0.02 <0.02 Metals-Total Aluminum mg/L - - 0.267 0.107 I( 0.104 B 0.254 0.257 0.104 B 0.248 B Antimony mg/L <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 Arsenic mg/L 0.00002 0.00024 B 0.00041 B 0.00024 B 0.00021 B 0.00024 B <0.0002 0.00028 B Boron mg/L 0.75 0.039 B 0.03 0.032 B 0.036 B 0.038 B <0.03 0.0413 Chromium 111=0.005 Chromium mg/L <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 4.02 Chromium VI=0.016 Chromium VI=0.011 Copper mg/L 0.0213 00136 <0.01 <0.01 <0-01 <0.01 <0.01 <0.01 <0.01 Iron mg/L 1 0,323 0.17 0.169 0.302 0.328 0.175 0.328 Lead mg/L 0.05 - 0.00018 B <0.0001 <0.0001 0.00015 B 0.0002 B <0.0001 0.00024 B Manganese mg/L 0.05 - <0.01 0.017 B 0.022 B <0.01 0.01 B 0.022 B 0.014 B Mercury mg/L 3.513 1.941 <0.0002 <0.0002 1 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 Molybdenum mg/L 0.15 0.00143 0.00051 0.00096 0.00137 0.00149 0.00068 0.00226 Silver mg/L 0.0047 0.00017 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 Thallium mg/L - <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 ;48.8 Uranium mg/L - 0.0125 0.001 0.0107 0.0132 0.012 0.00251 Zinc mg/L 0.249 0.188 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 Gross Alpha pCi/L 12 1.2 6.6 6.6 10 4.3 Gross Beta pCi/L 3.6 3.3 3.2 4.6 6.9 3 Radium 226.Dissolved pCi/L 0.09 0.2 -0.04 0.27 0.17 0.02 0.32 Radium 226-Total pCi/L 0.3 0.14 0.14 0.27 0.23 0.22 0.22 Radium 228.Total pCi/L 1.3 -0.76 0.44 1.8 1.6 0.21 -0.17 Radium 226+Radium 228-Total pCi/L 0.3 0.14 0 0.27 0.23 0.22 0.22 Notes: Acute and chronic standards for cadmium,chromium ill,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 detected above the criteria. B=Estimated concentration H=Analysis exceeded method hold time NO3=Nitrate NOz=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 9OF 16