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<br />4.1.4 Wells Associated With the NSI Project <br />The following well-field related activities occurred in 2009: <br />• The IOH-C core hole was drilled to provide information prior to drilling the 1 OH injection and <br />recovery wells. This well was subsequently redeveloped into Dissolution Surface monitor well, <br />DS-4. This well will also be used to measure subsidence in the eastern portion of Panel 2. <br />• The .12H-C core hole was drilled provide information prior to drilling the I1H injection and <br />recovery wells. This well was subsequently redeveloped into B-Groove monitor well BG-5. <br />• Horizontal injection and recovery wells, 10H-I and 10H-R were drilled along the southwest <br />portion of Panel 2. The cavity was brought on-line in the second half of the year. <br />• Horizontal injection and recovery wells, l IH-1 and IIH-R were drilled approximately 250 feet <br />north of the l OH cavity. The cavity was brought on-line toward the end of 2009. <br />• A summary of NSI wells as of 01/01/2009 follows: <br />• Three active production wells: 7H, IOH andI 1H. <br />• Three inactive production wells: 5H, 6H, 7H-I. <br />• Twenty-one active monitoring wells <br />• Five active subsidence monitoring wells <br />• One raw water supply well, 90-1 (Active) <br />• Fifteen 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 2009. <br />2009 Annual Report 5 of 33