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COLORADO LEGACY LAND <br /> Table 2: Summary of Analytical Sample Suite <br /> Segment 17b,Ralston <br /> Domestic Water Creek Surface Water Concentration Groundwater Concentration from Wells <br /> Supply-Drinking (CDPHE 2019) (January 2018 to July 2022) (January 2018 to July 2022) <br /> Parameter Units Water Standards <br /> CDPHE 2018 Standard Standard <br /> ( ) Acute Chronic Minimum Maximum Average Deviation Minimum Maximum Average Deviation <br /> Recommendation <br /> Remove. No applicable surface water or <br /> Radium 226-Total pCi/L - 0.08 2.3 0.37 0.28 -0.02 43 4.10 9.36 groundwater criteria. Monitor as total Radium <br /> 226 and Radium 228. <br /> Remove. No applicable surface water or <br /> Radium 228-Total pCi/L - - - -1.1 5.3 0.50 0.85 -0.78 6.5 0.91 1.28 groundwater criteria. Monitor as total Radium <br /> 226 and Radium 228. <br /> Radium 226 +Radium 228 pCi/L 5 - - 0.0 5.7 0.55 0.78 0 43 4.59 9.55 Site COPC,retain in monitoring network. <br /> -Total <br /> Notes: <br /> CDPHE. 2019. Regulation 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 /> CDPHE,2018. 5 CCR 1002,Regulation 41 -The Basic Standards for Ground Water(Radioactive Materials Standards,Table A Ground Water Organic Chemical Standards,Table 1 Domestic Water Supply-Human Health Standards,Table 2 Domestic <br /> Water Supply-Drinking Water Standards,and Table 4 TDS Water Quality Standards),December. <br /> pCi/L= picocuries per liter <br /> mg/L= milligrams per liter <br /> PAGE 9 OF 23 <br />