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4.1.6 Wells Associated With the NSI Proiect <br />• Production well 1-3A (C0~358-04646) was recompleted to a Dissolution Surface Aquifer <br />monitoring well. A subsidence monitoring well, 2M-TDR was drilled and completed with TDR <br />~ • <br />cables from 55 feet above the Dissolution Surface, to just above the 6-R zone. Well 2M-TDR <br />was located within 100 feet of 5H and 6H intersection with 1A cavity. It is equipped with four <br />TDR cables terminating at 20 feet intervals starting at 1823, 1803, 1783 and 1763 feet from <br />ground level. The well is cemented to surface. A second subsidence well was drilled after all <br />four 2M-TDR cables failed. Well 3M-TDR was drilled twenty feet north of 2M-TDR. Cables <br />were installed above the Dissolution Surface similar to 2M-TDR, but a 4'/cinch OD pipe was <br />installed for backup logging capability. <br />Shut-in injection well 93-4H was plugged and abandoned. A pipe well marker was installed at <br />the surrace per BLM requirements. <br />Summary of NSI wells is as follows: <br />As of 1/1/2Q04 Nine active production wells <br />Six shut in production wells (one lacking connection to cavities) <br />Eighteen active monitoring wells <br />One shut in sonar access well <br />Four active subsidence/V1/L monitoring wells <br />One raw water supply well, 90-1 <br />I . <br />Refer to Table 4-1 for names and descriptions of all existing wells. <br />11 <br />