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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 /> Physical Properties <br /> TDS-Total Dissolved Solids mg/L - - 60 3450 224 254 108 1,270 509 263 Remove. No applicable surface water or <br /> groundwater criteria. <br /> TSS-Total Suspended Remove. No applicable surface water or <br /> Solids mg/L - - - 0 14 1 2 0 35 2 9 groundwater criteria&routinely non-detect. <br /> Major Ions <br /> Alkalinity as CaCO3 mg/L - - - 40.2 205 74 29 50.2 310 163 59 Remove. No applicable surface water or <br /> groundwater criteria. <br /> Bicarbonate as CaCO3 mg/L - - - 40.2 190 74 29 50.2 293 161 57 Remove. No applicable surface water or <br /> groundwater criteria. <br /> Calcium-Dissolved mg/L - - - 4.6 81.2 30 11 11.9 185 69.3 40 Remove. No applicable surface water or <br /> groundwater criteria. <br /> Carbonate as CaCO3 mg/L - - - 0 15 0 4 0 18.1 0.9 5 Remove. No applicable surface water or <br /> groundwater criteria&routinely non-detect. <br /> Chloride mg/L 250 - 250 1.6 81.6 44 18 0 213 24.5 23 Remove.Routinely under surface water criteria. <br /> No applicable groundwater criteria. <br /> Fluoride mg/L 4 - - 0 0.55 0.3 0 0 2.1 0.49 0.4 Remove. No applicable surface water or <br /> groundwater criteria. <br /> Hydroxide as CaCO3 mg/L - - - 0 0 0 - 0 0 0 - Remove. No applicable surface water or <br /> groundwater criteria&routinely non-detect. <br /> Magnesium-Dissolved mg/L - - - 1.8 35.1 9 4 4.1 70 28.0 18 Remove. No applicable surface water or <br /> groundwater criteria. <br /> Potassium-Dissolved mg/L - - - 1 4.3 2 1 1.5 10.1 4.7 2 Remove. No applicable surface water or <br /> groundwater criteria. <br /> Sodium -Dissolved mg/L - - - 10.5 99.5 22 13 9.6 208 46.7 51 Remove. No applicable surface water or <br /> groundwater criteria. <br /> Sulfate mg/L 250 - 250 0 201 30 31 12.2 686 200.6 154 Remove.Routinely under surface water criteria. <br /> No applicable groundwater criteria. <br /> Cyanide-Weak Acid mg/L 0.2 0.005 - 0.0000 0.0138 0.0001 0.0049 0.0000 0.0040 0.0000 0.0000 Remove. Not a COPC for the site,routinely non- <br /> Dissociable detect. <br /> Nitrate+Nitrite as N mg/L 10 NO3=10 NO2=0.05 0.0000 1.0700 0.0478 0.2120 0.0000 3.6600 0.6929 0.7600 Remove. Not a COPC for the site,routinely non- <br /> detect. <br /> Remove. No applicable surface water or <br /> Phosphate-Total mg/L - - - 0.0000 0.3400 0.0148 0.0666 0.0000 0.3100 0.0155 0.0616 groundwater criteria. Not a COPC for the site, <br /> routinely non-detect. <br /> Phosphorus-Total mg/L - - 0.11 0.0000 0.1100 0.0049 0.0212 0.0000 11.0000 0.1131 1.7808 Remove. Not a COPC for the site,routinely non- <br /> detect. <br /> Metals-Dissolved <br /> Remove. No applicable surface water or <br /> Aluminum mg/L 5 - - 0.0000 0.2800 0.0076 0.1037 0.0000 0.2400 0.0045 0,0649 groundwater criteria. Not a COPC for the site, <br /> routinely non-detect. <br /> PAGE 6 OF 23 <br />