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Table E-3 Groundwater Quality Data for Monitoring Wells MW-7 through MW-13 2008 through 2010 Holcim (US) Inc. Florence, CO Analyte Mar-08 MW-7 Compliance Apr-09 Jun-09 Sep-09 . Dec-09 Mar-10 Field Parameters MCL MW-7 MW-8 MW-9 ' MW-11 MW-12 Standards MW-7 MW-12 MW-13 MW-13" MW-13 , MW-13 MW-7 ' MW-12 MW-13 pH(std.units) 6.5-8.5b 7.95 6.97 6.96 7.11 6.93 6.5-8.5a 9.21 7.63 7.99 7.01 6.95 7.00 8.41 7.12 7.24 Conductivity(mS/cm) NA 2058 3095 3361 3204 3764 NA 1.109 3.231 2.900 3.215 2.934 2.7 1.309 3.974 3.300 Temperature(°C) NA 17.63 15.61 17.33 18.80 18.72 NA 17.3 20.9 14.3 16.9 13.1 13.90 16.4 15.8 13.2 Laboratory Results Alkalinity NA 458 352 239 198 348 NA 581 331 379 409 -- -- -- -- -- Chloride 250b 37 31 33 37 36 NA 42 36 29 29 -- -- -- -- -- Fluoride 2.0` 0.80 0.9 1.1 0.7 3.4 NA 1.1 3.6_ 0.8 0.9 -- -- -- , -- -- Hardness,as CaCO3 NA 961 1830 2110 1960 2540 NA 148 2620 2140 2140 -- -- -- -- - Nitrate as N 10.0a 0.03 B 0.04 B 0.16 0.24 0.06 B NA 0.05 B 0.05 B_ 0.08 B 0.08 B -- -- -- -- -- Nitrogen,ammonia NA 0.98 0.75 0.15 B 0.31 B 0.74 NA 1.23 0.27 B 0.28 B <0.05 -- -- -- -- -- Total Dissolved Solids 1.5 x bkg 1940 3190 3570 3410 4030 3918 720, 3990 3660 3620 3,630 3,470 720 3960 3300 Sulfate 250b 850 1730 1840 1980 2300 2080 35 2300 2000 1900 1,900 1,800 4 B 2400 2000 Aluminum(total) 5.0` 5.97 0.17 B 1.17 3.11 21.70 NA 9.26 23.1 7.36 9.85 -- -- -- -- -- Arsenic(total) 0.05a 0.0027 0.0010 B 0.001 U 0.0009 B 0.0033 NA 0.0027 0.006 0.005 0.003 B -- -- -- -- -- Calcium(dissolved) NA 202 438 458 439 477 NA 24.2 488 492 491 -- -- -- -- -- Calcium(total) NA 206 444 458 439 474 NA 46.1 525 539 524 -- -- -- -- -- Iron 0.3b 4.18 0.54 1.85 3.17 14.40 4.5 0.02 U 0.08 0.04 B 0.07 <0.02 <0.02 0.78 0.25 0.11 Magnesium(dissolved) NA 111 178 235 209 329 NA 21.4 341 222 221 -- -- -- -- -- Magnesium(total) NA 112 180 232 208 323 NA 26.5 726 225 195 -- -- -- -- -- Manganese(total) 0.05b 0.085 0.196 0.317 0.324 0.623 0.88 _ 0.105 0.673 0.13 0.26 0.113 0.056 0.019 B 0.586 0.018 B Potassium(total) NA 10.4 10.9 9.3 13.0 18.8 17 7.2 20.3 11.9 11.8 10.3 11.0 5.6 13.5 9.3 Selenium(total) 0.02` 0.0005 0.0007 0.0005 B 0.0030 0.0023 0.02d 0.0008 0.0027 0.139 0.0335 -- -- -- -- -- Sodium(total) NA 226 207 199 209 221 226 236 156 249 193 225 199 228 186 164 Notes: All units are in mg/L unless noted otherwise. Bolded values-Screening level exceeded. B-Analyte concentration detected at a value between Method Detection Limit and Practical Quantitation Limit bkg-Background. MCL-Maximum concentration limit. NA-Not available. U-The analyte was analyzed for,but not detected.Detection limit is numeric value shown. Multiple screening levels present in some instances due to proposed background standards for MW-7. aDRMS-approved Numeric Protection Levels for MW-7. bMCL source:Table 1 Human Health Standards,Regulation 41 bMCL source Table 2 Secondary Drinking Water Standards,Regulation 41. dMCL source:Table 3 Agricultural Standards for Groundwater,Regulation 41. eMCL source:Table 4 TDS Water Quality Standards,Regulation 41. Page 1 of 1