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3.2.3 Total Dissolved Solids <br />• Total dissolved solids (TDS) consistently were above the SDWS. TDS concentrations generally ranged from 500 up to 1400 <br />mg/L from December 2006 through October 2007. TDS concentrations exceeded the baseline levels in CRMW01 CRMW02, <br />CRMW09, and CRMW41. All four of these wells are located approximately Yz a mile or further from the active mine area and <br />likely not influenced by this activity. There are no apparent temporal or spatial trends identified with the total dissolved solid <br />concentrations reported to date. <br />There were only two TDS results reported at the time of the WOBR in CRMW09. Since that time four additional tests have <br />been completed on each of these wells and therefore a new baseline level is proposed for CRMW09 below. Baseline levels <br />for CRMW01, CRMW02, and CRMW41 have also been modified based on the additional data and distance from the mining <br />activities up to the October 2007 sampling event. <br />Total Dissolved Solids <br /> Wells (CRMW) Site/Group <br /> Ol 02 04 05 O6 07 9 16 40 41 42 A VG <br />Oct-05 994 1019 1017 656 923 767 ---- --- 743 875 ---- 874.3 <br />Nov-05 943 976 840 1030 952 852 1080 980 766 884 931 930.4 <br />Dec-05 1000 980 1010 ---- 896 842 ---- ---- 760 936 •--- 917.7 <br />Apr-06 938 869 1000 ---- 830 743 ---- ---- 678 1010 ---- 866.9 <br />Jul-06 1100 960 624 ---- 920 186 ---- ---- 624 917 ---- 761.6 <br />Oct-O6 1250 1160 804 648 685 1100 1270 1010 910 920 985 976.5 <br />Dec-06 1351 1114 792 ---- ---- ---- 1312 948 ---- ---- ---- 1103.4 <br />Apr-07 1152 1250 612 ---- 738 ---- 1296 842 ---- 1134 ---- 1003.4 <br />Jul-07 1188 1121 540 ---- 637 ---- 1216 942 ---- 1136 737 939.6 <br />Oct-07 1255 981 553 829 769 ---- 1331 801 726 1221 717 918.3 <br />Average 1117.1 1043.0 779.2 790.8 816.7 748.3 1250.8 920.5 743.9 1003.7 842.5 926.3 <br />Stnd Dev. 145.0 114.4 189.6 180.0 114.5 303.2 92.7 81.5 88.9 128.3 135.4 213.2 <br />2006 <br />Baseline 1157 1089 1075 ---- 1075 1075 ---- ---- 1075 1075 --•• 1075 <br />2007 <br />Baseline 1267_ 1157 1075 ---- 1075 1075 1344 1075 1075 1132 ---- 1075 <br /> <br />The average site-wide result for total dissolved solids has increased 30.8 mg/L from the WOBR to 926.3 mg/L with a standard <br />deviation of 213.2 mg/L. <br />3.2.4 pH <br />PH levels ranged from 6.88 up to 7.67 in the December 2006 through October 2007 sampling events. This range is <br />considered normal for groundwater. It is recommended that the CDPHE limits of 6.5 to 8.5 be used to evaluate pH conditions <br />at the site. <br />• <br />Annual 2007 Sampling Report -Lupton Lakes -10- January 2008 <br />