2022-03-01_HYDROLOGY - M1977300 - Laserfiche WebLink

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_1*4%� -ILORAoo LEGACY LAND TABLE 2B:SUMMARY OF SURFACE WATER ANALYTICAL DATA Surface Water Quality Standards Segment 17b,Ralston Creek Sample Location Parameter Units (CDPIIE 2021)1 SW-ARH SW-AWD SW-NWRP Acute Chronic 10/21/2021 12/08/2021 12/08/2021 Uranium m1;/I, 0.030 0.030 0.111 0.00355 _ 0.0124 Zinc in{;/I. 0.249 0.188 <0.02 <0.02 <0.02 Metals-Total Aluminum mg/L - - <0.05 <0.25 <0.1 Antimony mg/L - - <0.0004 <0.0004 <0.0004 Arsenic mg/L - 0.00002 0.00078 B <0.0002 <0.0002 Boron mg/L - 0.75 0.135 <0.03 <0.06 Chromium mg/L Chromium III=0.005 - <0.02 Chromium IV=0.016 Chromium IV=0.011 <0.1 <0.04 Copper mg/L 0.0213 0.0136 <0.01 <0.05 <0.02 Iron mg/L - 1 0.422 <0.3 0.387 Lead mg/L 0.05 - <0.0001 <0.0001 <0.0001 Manganese mg/L 0.05 - 0.209 <0.05 0.025 B Mercury mg/L 3.513 1.941 <0.0002 <0.0002 <0.0002 Molybdenum mg/L - 0.15 0.01.32 0.0048 B 0.00123 Silver mg/L 0.0047 0.00017 <0.0001 <0.0001 <0.0001 Thallium mg/L - - <0.0001 <0.0001 <0.0001 Uranium mg/L 0.030 0.030 0.109 0.00364 0.0131 Zinc mg/L 0.249 0.188 <0.01 <0.1 <0.04 Gross Alpha pCi/L - 68 2.5 9.2 Gross Beta pCi/L 39 6.4 5.8 Radium 226-Dissolved pCi/L 0.93 0.15 0.22 Radium 226-Total pCi/L 0.87 0.11 0.24 Radium 228-Total pCi/L 0.44 1 0.98 0.67 Radium 226+Radium 228-Total pCi/L 0.87 0 0.24 Notes: 'Acute and chronic standards for cadmium,chromium 111,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 NO3=Nitrate NO-Nitrite CaCO3=Calcium Carbonate mg/L=milligrams per Liter pCi/L=picocuries per Liter Chromium III=Trivalent Chromium Chromium IV=Tetravalent Chromium Source: CDPHE. 2021. 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.December. PAGE 90t 15