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COLORADO LEGACY LAND <br /> TAMMUMMARY OF SURFACE VISMANALYTICAL DATA <br /> Surface Water Quality Standards <br /> Segment 17b,Ralston Creek Sample Location <br /> Parameter Units <br /> (CDPHE2019)' SW-ARH SW-AWD SW-BPL SW-FBRG SWLLHG SW-NWRP SW-Weir <br /> Acute Chronic 07/19/2021 07/19/2021 07/19/2021 07/19/2021 07/19/2021 07/19/2021 07/19/2021 <br /> Uranium mg/L 0.0207 0.00111 0.0191 0.0206 0.0206 0.00325 0.02 <br /> 'Line mg/L 0.249 0.188 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <br /> Aluminum mg/L - <0.05 0.05 <0.05 '0.05 <0.05 0.05 0.065B <br /> Antimony mg/L <0.0002 <0.0002 <0.0002 <0,0002 <0.0002 <0.0002 <0.0002 <br /> Arsenic mg/L 0.00002 0.00057 B <0.0002 0.00061 B 0.00059 B 0.00052 B 0.000258 0.00057 B <br /> Boron mg/L 0.75 0.037 B 0.03 0.034 B 0.038 B 0.037 B <0.03 0.038 B <br /> Chromium III=0.005 - <br /> Chromium mg/L <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <br /> Chromium IV=0.016 Chromium IV=0.011 <br /> Copper mg/L 0.0213 0.0136 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <br /> Iron mg/L 1 0.111 B 0.09 B 0.124 B 0.137 B 0.147 B 0.164 0.249 <br /> Lead mg/L 0.05 <0.0001 <0.0001 <0.0001 <0.0001 0.00013 B 0.000138 0.0002 B <br /> Manganese mg/L 0.05 - 0.012 B <0.01 <0.01 4.01 0.019 B 0.014 B 0.035 B <br /> Mercury mg/L 3.513 1.941 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <br /> Molybdenum mg/L 0.15 0.00194 0.00054 0.00129 0.00137 0.00248 0.0009 0.00316 <br /> Silver mg/L 0.0047 0.00017 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <br /> Thallium mg/L - <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 -0.0001 4.0001 <br /> Uranium mg/L - - 0.0234 0.00127 0.0219 0.0239 0.023 0.00369 0.0224 <br /> 'Lint mg/L 0.249 0.188 <0.02 <0.02 <0.02 <0.02 4.02 <0.02 <0.02 <br /> Gross Alpha pCi/I. 16 0.5 14 21 15 2.7 16 <br /> Gross Beta pCi/I. 7.8 3.4 6.7 9.1 8.4 5.2 8.8 <br /> Radium 226-Dissolved pCi/L 0.18 0.07 0.25 0.26 0.39 0.18 0.38 <br /> Radium 226-Total pCi/L 0.13 0.17 0.45 0.35 0.4 0.19 0.31 <br /> Radium 228-Total pCi/I. 0.2 0.36 0.28 0.15 0.76 -0.09 0.93 <br /> Radium 226+Radium 228-Total pCi/L 0 0.17 0.45 0.35 0A 0.19 0.31 <br /> Notes: <br /> 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. <br /> Bold and grey-shaded analytical results are detected above the criteria. <br /> B=Estimated concentration <br /> NO3=Nitrate <br /> NO2=Nitrite <br /> CaCO3=Calcium Carbonate <br /> mg/L=milligrams per Liter <br /> pCi/L=picocuries per Liter <br /> Chromium 111=Trivalent Chromium <br /> Chromium IV=Tetravalent Chromium <br /> Source: <br /> 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 <br /> PAGE 90F 1S <br />