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Table 3 Monitoring Well W -1 Whirlwind Monitoring Well, W -1 W -1, EFRC, 10/21/08 General Parameters Major Ions (mg /L) Dissolved Metals (ni Sample Information Aquifer ( TSS TDS PH Hard Alk Cord Na Ca Mg K CI F NO, P - HCO, SO, AI As Be Be 43 :, (mg/L) (mg/L) (s.u.) (mg/L) (mg /L) (pSlcm) i 13 173 Whirlwind Monitoring Well, W -1 W -1, EFRC, 10/21/08 LBB 37 901 7.96 165 269 1543 286 43 14 i 13 173 0.3 <0.1 0.08 328 237 <0.1 0.009 <0.1 <0.01 W -1, EFRC, 12 /16/08 LBB 110 824 7.73 287 1329 265 36 12 12 145 0.4 <0.1 0.03 350 174'. 0.015 <0.1 <0.01 W -1, EFRC, 2/10/09 LBB 2 696 7.82 300 i 1251 200 24 8 8 42 0.4 <0.1 <0.01 366 149 0.018 <0.1 <0.01 W -1, EFRC, 4/20/09 LBB <4 698 7.82 298 1209 206 25 8 9 113 0.5 0.4 0.02 363 139 0.022 <0.1 <0,01 W -1, EFRC, 6124/09 LBB <4 730 7.63 287 - 1157 222 27 9 11 113 0.4 <0.1 <0.01 350 158 0.023 ! <0.1 <0.01 W -1, EFRC, 9/11109 LBB <4 733 7.91 294 1219 229 29 9 11 113 0.4 <0.1 - <0.005 ! 358 166 0.025 <0.1 <0.01 W -1, EFRC, 12/10/09 LBB <4 713 7.96 296 1182 220 28 9 11 122 0.4 <01 <0.005 361 168 0.026" <0.1 <0.01 W -1, EFRC, 214/10 LBB 4 695 7.01 308 1240 216 29 - 9 10 122 0.4 <0.1 0.008 367 164 0.025 <0.1 <0.01 MW-i, EFRC, 6/7/10 LBB <4 751 7.73 301 1239 233 31 10 11 113 0.4 <0.1 <0.005 j 367 159 0.025 <0.1 <0.01 MW -1, EFRC, 5/24111 LBB <4 - 715 7.85 299 1210 240 29 9 11 119 0.4 <0.1 0.009 365 149 0.028 <0.1 <0.01 W -1, EFRC, 6/4/12 LBB 155 727 7.92 306 1252 208 35 9 11 112 0.4 <0.1 0.076 373 133 0.028 <0.1 <0.01 MW -1, EFRC, 6/17 /2013 LBB 235 710 1 7.31 303 1216 237 30 9 11.00 114 0.4 <0.1 0.178 370 136 0.028 1 <0A <0.01 MW -1, EFRC, 6 /18/2014 LBB 158 724 1 7.76 313 1349 1 227 33 10 11.00 119 0.4 <0.1 0.24 381 141 0.026 i <0.1 <0.01 Colorado Water Standards Ground Water, Domestic ' 6.5 to 8.5i 250 4.0 70.0 250 0.07 2.0 0.004 Ground Water, Agriculture ' 6.5 to 8.5! 2 100 5 0.1 0.1 Surface Water, Stream (e.f) 16.5 to 9.0 1 0.100 : 0.100 1 Surface Water, Domestic 15.0 to 9.0i 250 1 2.0 10 250 0.1 f 1.0 0.004 Surface Water Agriculture 100 e 0.1 0.1 EPA Water Standards (h) Maximum 30 I6.0 to 9.0!I Average 20 ! !116.0 to 9.0' Notes: 1. Water standards are provided for reference only. These standards do not apply to the site groundwater unless it is used for drinking water, irrigation, or other regulated uses. 2. Concentrations or activity levels above a state or federal standards are shaded for reference purposes. Shading indicates that the measured level is elevated compared to certain standards of water use. 3. Metal levels are reported as dissolved and radionuclide levels are reported as total recoverable. Table 3 Water Quality Data Monitoring Well W -1 Page 5 of 16