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• Nineteen active monitoring wells <br />• Four active subsidence monitoring wells <br />• One raw water supply well, 90-1 <br />• 1 new proposed production well - 7H-1 V <br />• Eleven plugged and abandoned wells <br />4.1.5 Other Activities <br />The potentiometric levels monitored in the surrounding Dissolution Surface aquifer monitoring <br />wells provided continuous data, which was used to manage production/recovery operations at <br />each of the active cavities. Throughout the year injection and recovery rates were successfully <br />adjusted to maintain monitoring well levels to target levels. <br />4.2 New Findings or Developments <br />There were no new findings or developments in 2007. <br />4.3 2007 Operation Results <br />Mining and production activities were continuous in 2007. The following table provides a <br />summary of mining and process results: <br />Table 4.1-Mine and Process Data <br />2007 <br /> <br />Month <br />Avg. <br />GPM Recovery <br />Temp. <br />Plant Assay <br />Bicarb <br />/1 Assay <br /> <br />NaCI /1 Tons <br />Cavity <br />#lA Tons <br />Cavity <br />#SH Tons <br />Cavity <br />#6H Monthly <br />Total <br />Tons <br />January-07 686 189 187 66 690 1,594 5,266 7550 <br />February-07 831 191 186 66 721 1,729 5,640 8091 <br />March-07 725 189 185 65 673 1,667 5,330 7669 <br />A ril-07 744 189 184 65 693 1,904 5,824 8422 <br />May-07 783 191 185 65 744 2,096 6,334 9174 <br />June-07 621 190 183 65 604 1,571 4,914 7090 <br />July-07 782 194 184 67 722 1,991 6,057 8769 <br />August-07 536 191 186 67 571 1,607 4,842 7019 <br />Se tember-07 706 195 183 66 793 1,802 6,006 8600 <br />October-07 806 197 186 66 831 2,287 6,974 10092 <br />November-07 828 195 185 66 691 2,044 6,026 8760 <br />December-07 726 196 185 65 678 1,729 5,422 7829 <br />AVERAGE 731 192 185 66 701 1835 5720 8255 <br />TOTAL 8410 22020 68636 99065 <br />Key to above headings: <br />Ave. GPM -monthly average injection flow rate during process operations. <br />Temp. - Temperature in degrees F recovered at the pregnant liquor tank. <br />Assay - g/1 sodium chloride or sodium bicarbonate in the composite recovery liquor as total bicarbonate. (Total bicarbonate = <br />bicarbonate g/1 + 1.58 x carbonate g/1). <br />Tons - total monthly bicarbonate production without adjustments per cavity. <br />