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3.2.3 Total Dissolved Solids <br />Total dissolved solids (TDS) consistently were above the initial SDWS of 500 mg/L. Regulation 41, "The Basic Standards for <br />Groundwater' state that the allowable TDS concentration levels should be 1.25 times the background level for background <br />TDS concentrations between 500 mg/L and 10,000 mg/L. The TDS numeric level concentrations generally ranged from 375 <br />up to 1400 mg/L from December 2006 through October 2008. There are no apparent temporal or spatial trends identified with <br />the total dissolved solid concentrations reported to date. <br />Totai niccn/vaA Crxr& <br /> Wells (CRMW) <br /> Site/Group <br /> 01 02 04 05 06 07 9 16 40 41 42 A VG <br /> <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-06 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 />Jan-08 1152 909 630 ---- 763 ---- 1239 747 ---- 1163 ---- 943.3 <br />Apr-08 ---- ---- ---- ---- 739 ---- ---- ---- ---- ---- ---- 739.0 <br />Jul-08 605 ---- 376 ---- 730 ---- 1067 617 ---- 910 ---- 717.5 <br />Oct-08 910 ---- 670 570 700 ---- 1100 547 580 1120 550 749.7 <br />Average 1064.5 1030.8 728.3 746.6 790.9 748.3 1212.3 826.0 723.4 1018.8 784 <br />0 898 <br />3 <br />Stnd . . <br />Dev. 195.7 115.8 201.4 184.5 102.6 303.2 103.9 163.8 100.6 126.7 175.7 225.1 <br />2007 <br />Baseline 1262 1157 1075 ---- 1075 1075 1344 1075 1075 1132 --- 1075 <br />The average site-wide result for total dissolved solids has decreased 28 mg/L from 2007 to 2008 with a standard deviation of <br />225.1 mg/L. <br />Annual 2008 Sampling Report - Lupton Lakes 10- December 2008