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� COLORADo LEGACY LAND <br /> TABLE 1B:SUMMARY OF SURFACE WATER ANALYTICAL DATA <br /> Surface Water Quality Standards <br /> Sample Location <br /> Segment 17b,Ralston Creek <br /> Parameter Units CDPHE 2019 1 SW-ARH SW-BPL SW-FBRG SW-LLHG SW-Weir SW-AWD SW-NWRP <br /> Acute Chronic 3/3/2020 3/3/2020 3/10/2020 3/3/2020 3/3/2020 3/10/2020 3/10/2020 <br /> Iron m L - 1 0.06 0.20 0.14 0.14 0.10 <0.03 0.07 <br /> Lead m L 0.05 - <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <br /> Manganese m L 0.05 - 0.01 0.01 <0.01 0.02 0.02 <0.01 <0.01 <br /> Mercury m L 3.513 1.941 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <0.0002 <br /> Molybdenum m L - 0.15 0.0025 0.0011 0.0011 0.0032 0.0038 0.0006 0.0008 <br /> Silver m L 0.0047 0.00017 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <br /> Thallium m L - - <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <br /> Uranium m L - - 0.0146 0.0086 0.0084 0.0165 0.0164 0.0017 0.0042 <br /> Zinc m L 0.249 0.188 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <br /> Radionuclides <br /> Gross Alpha Ci L - - 9.2 5.9 4.9 9.7 8.30 0.72 2.80 <br /> Gross Beta Ci L - - 6 5.5 4.2 9.3 3 4.8 1.3 <br /> Radium 226-Dissolved Ci L - - 0.42 0.41 0.32 0.76 0.59 0.21 0.36 <br /> Radium 226-Total Ci L - - 0.5 0.48 0.32 0.62 0.44 0.45 0.44 <br /> Radium 228-Total Ci L - - -0.432 1.3 0.32 -0.422 0.48 -0.392 0.31 <br /> Radium 226+ Radium 228-Total Ci L - - 0.5 0.5 0.3 0.6 0.4 0.5 0.4 <br /> Notes: <br /> 1 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. <br /> 2Negative values are shown as less than lower limit of detection <br /> Bold and grey-shaded analytical results are greater than one or more criteria. <br /> NO3=Nitrate <br /> NO2=Nitrite <br /> CaCO3=Calcium Carbonate <br /> mg/L=milligrams per Liter <br /> pCi/L=picocuries per Liter <br /> Chromium III=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 6 OF 12 <br />