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_ 40�COLORAOo LEGACY LAND <br /> TABLE 2B:SUMMARY OF SURFACE WATER <br /> Surface Water Quality Standards Sample Location <br /> Segment 17b,Ralston Creek <br /> Parameter Units CDPHE 2019 , SW-ARH ilk SW-LLHG <br /> %t <br /> Acute Chtnaic �/� Z4Q 11/,1Q/zo2o. 11/ <br /> Copper mg/L 0.0213 0.0136 <0.01 <0.01 <0.01 <br /> Iron m L 1 0.267 0.169 0.205 <br /> Lead m L 0.05 -0.0001 <0.0001 <0.0001 <br /> Manganese m L 0.05 - 0.123 0.026 0.179 <br /> Mercury m L 3.513 1.941 <0.0002 <0.0002 <0.0002 <br /> Molybdenum m L - 0.15 0.0111 0.00962 0.00964 <br /> Silver m L 0.0047 0.00017 <0.0001 <0.0001 <0.0001 <br /> Thallium m L <0.0001 <0.0001 <0.0001 <br /> Uranium m L 0.101 0.0493 0.012 <br /> Zinc m L 0.249 0.188 <0.02 <0.02 <0.02 <br /> ON <br /> Gross Alpha Ci L 80 32 6.9 <br /> Gross Beta Ci L 35 23 8.5 <br /> Radium 226-Dissolved i L 0.68 0.19 0.34 <br /> Radium 226-Total i L 2.1 0.57 0.32 <br /> Radium 228-Total i L 0.44 0.32 0.87 <br /> Radium 226+Radium 228-Total Ci L 2.1 0.57 0.32 <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 greater than one or more criteria. <br /> NO3=Nitrate <br /> NO2=Nitrite <br /> CaCO,=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 9 OF 1S <br />