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COLORADO LEGACY LAND Table 2: Summary of Analytical Sample Suite Segment 17b,Ralston Domestic Water Creek Surface Water Concentration Groundwater Concentration from Wells Supply-Drinking (CDPHE 2019) (January 2018 to July 2022) (January 2018 to July 2022) Parameter Units Water ds Standar CDPHE radar Standard Standard ( ) Acute Chronic Minimum Maximum Average Deviation Minimum Maximum Average Deviation Recolpmendation Remove. Not a COPC for the site. Colorado's I Arsenic mg/L 0.01 - 0.00002 0.0000 0.0059 0.0004 0.0010 0.0000 0.0160 0.0010 0.0026 surface water standard does not include allowances for naturally occurring or background arsenic concentrations. Remove. No applicable surface water or Boron mg/L 0.75 - 0.75 0.0000 0.1870 0.0390 0.0502 0.0000 0.2600 0.0566 0.0623 groundwater criteria. Not a COPC for the site, 11 routinely non-detect. Chromium 111 = 0.005 Remove. No applicable surface water or Chromium mg/L 0.1 Chromium Chromium 0.0000 0.0200 0.0009 0.0042 0.0000 0.0100 0.0001 0.0000 groundwater criteria. Not a COPC for the site, 1V= 0.016 IV= 0.011 routinely non-detect. Remove. No applicable surface water or Copper mg/L 1 0.0213 0.0136 0.0000 0.0100 0.0002 0.0000 0.0000 0.3200 0.0047 0.0873 groundwater criteria. Not a COPC for the site, routinely non-detect. Remove. No applicable surface water or Iron mg/L 0.3 - 1 0.0000 0.9100 0.1947 0.1741 0.0000 229.0000 2.6300 26.2782 groundwater criteria. Not a COPC for the site, routinely non-detect. Remove. No applicable surface water or Lead mg/L 0.05 0.05 - 0.0000 0.0030 0.0001 0.0007 0.0000 0.1420 0.0020 0.0190 groundwater criteria. Not a COPC for the site, routinely non-detect. Manganese mg/L 0.05 0.05 - 0.0000 0.2090 0.0266 0.0410 0.0000 3.5900 0.1327 0.4617 Site COPC,retain in monitoring network. Remove. No applicable surface water or Mercury mg/L 0.002 3.513 1.941 0.0000 0.0000 0.0000 - 0.0000 0.0000 0.0000 - groundwater criteria. Not a COPC for the site, routinely non-detect. Molybdenum mg/L 0.21 - 0.15 0.0000 0.0200 0.0012 0.0044 0.0000 0.1200 0.0291 0.0264 Site COPC,retain in monitoring network. Remove. No applicable surface water or Silver mg/L 0.05 0.0047 0.00017 0.0000 0.0000 0.0000 - 0.0000 0.0060 0.0001 0.0019 groundwater criteria. Not a COPC for the site, routinely non-detect. Remove. No applicable surface water or Thallium mg/L 0.002 - - 0.0000 0.0000 0.0000 - 0.0000 0.0007 0.0000 0.0002 groundwater criteria. Not a COPC for the site, routinely non-detect. Uranium mg/L 0.03 0.030 0.030 0.0004 0.9060 0.0247 0.0875 0.0011 2.5900 0.5377 0.5905 Site COPC,retain in monitoring network. Remove. No applicable surface water or Zinc mg/L 5 0.249 0.188 0.0000 0.0130 0.0002 0.0024 0.0000 0.5700 0.0126 0.1161 groundwater criteria. Not a COPC for the site, routinely non-detect. Gross Alpha pCi/L 15 0.249 0.188 -0.61 530 15.95 51.19 0.95 2010 343 407 Site COPC,retain in monitoring network. Remove. No applicable surface water or Gross Beta pCi/L - 0.1 250 8.90 24.88 2.50 800 123.0 137.3 groundwater criteria. Monitor as total Radium j 226 and Radium 228. Remove. No applicable surface water or Radium 226-Dissolved pCi/L - - - -0.04 1.3 0.36 0.23 -0.02 52 4.16 9.91 groundwater criteria. Monitor as total Radium 226 and Radium 228. PAGE 8 OF 23