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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 Standards CDPHE 2018 Standard Standard ( ) Acute Chronic Minimum Maximum Average Deviation Minimum Maximum Average Deviation SOL Recommendation Remove. No applicable surface water or Antimony mg/L 0.006 - - 0.0000 0.0012 0.0000 0.0003 0.0000 0.0056 0.0003 0.0013 groundwater criteria. Not a COPC for the site, routinely non-detect Arsenic mg/L 0.01 0.34 - 0.0000 0.0039 0.0003 0.0007 0.0000 0.0072 0.0006 0.0017 Remove. Results consistently below surface water criteria.Not a COPC for the site. Remove. No applicable surface water or Boron mg/L 0.75 - 0.75 0.0000 0.1600 0.0329 0.0376 0.0000 0.2600 0.0542 0.0612 groundwater criteria. Not a COPC for the site, routinely non-detect Chromium _ Remove. No applicable surface water or Chromium mg/L 0.1 III=0.11 0.0000 0.0100 0.0001 0.0000 0.0000 0.0000 0.0000 - groundwater criteria. Not a COPC for the site, Chromium Chromium routinely non-detect IV=0.016 IV- 0.011 Remove. No applicable surface water or Copper mg/L 1 - - 0.0000 0.0240 0.0005 0.0057 0.0000 0.0170 0.0003 0.0026 groundwater criteria. Not a COPC for the site, routinely non-detect Remove. No applicable surface water or Iron mg/L 0.3 0.0213 0.0136 0.0000 0.3000 0.0406 0.0746 0.0000 2.0600 0.1268 0.3911 groundwater criteria. Not a COPC for the site, routinely non-detect. Remove. No applicable surface water or Lead mg/L 0.1 - 0.3 0.0000 0.0009 0.0000 0.0003 0.0000 0.0006 0.0000 0.0001 groundwater criteria. Not a COPC for the site, routinely non-detect. Manganese mg/L 0.05 0.109 0.0043 0.0000 0.1900 0.0172 0.0391 0.0000 0.7300 0.0911 0.2037 Site COPC,retain in monitoring network. Remove. No applicable surface water or Mercury mg/L 0.002 3.51 1.94 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 - - 0.0000 0.0300 0.0013 0.0058 0.0000 0.1210 0.0255 0.0255 Site COPC,retain in monitoring network. Remove. No applicable surface water or Silver mg/L 0.05 - - 0.0000 0.0000 0.0000 - 0.0000 0.0000 0.0000 - groundwater criteria. Not a COPC for the site, routinely non-detect Remove. No applicable surface water or Thallium mg/L 0.002 0.0047 0.00017 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 - - 0.0006 0.8280 0.0187 0.0593 0.0008 2.4500 0.6489 0.7141 Site COPC,retain in monitoring network Remove. No applicable surface water or Zinc mg/L 5 - 0.0000 0.4000 0.0028 0.1702 0.0000 0.0970 0.0043 0.0327 groundwater criteria. Not a COPC for the site, routine non-detect. Metals-Total Remove. No applicable surface water or Aluminum mg/L 5 0.0000 0.8400 0.0689 0.1802 0.0000 132 1.2212 18.2799 groundwater criteria. Not a COPC for the site, routinely non-detect. - Remove. No applicable surface water or Antimony mg/L 0.006 - 0.0000 0.0004 0.0000 0.0000 0.0000 0.0061 0.0003 0.0014 groundwater criteria. Not a COPC for the site, routinely non-detect PAGE 7 OF 23