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3. It is possible that measurable subsidence would not be evident in 2M-TDR for 12 <br />months or so. If we do nothing at ZM-TDR now, and install an improved SMW at 7H <br />later we will be in a better position to respond with a demonstrated technology at 2M-TDR if <br />and when the need arises. <br />Alternate SMW to be considered include; <br />1. Cased slim hole for gamma logging with/without radioactive tracers at joints and 5 feet <br />sections at bottom, no TDRs. <br />2. Similar completion to 2M-TDR, 4 TDR cables and cemented tubular. The tubular <br />installed with DV tools (Requires larger diameter hole and larger tubular cemented in <br />the hole) to cement between the A and B Grooves and above the A-Groove. The tubular <br />is cemented in place to provide access for gamma logging and inspection of damage to <br />the tubulaz resulting from ground movement above the cavern. <br />3. Drill, case and cement hole to within 100 feet of the R-6/L-6 contact, drill out at bottom <br />to 45 feet above Dissolution Surface, install thin tubular (2 inch) with 4 TDR cables as <br />in 2M-TDR and squeeze cement to 50 feet above the casing. With this option the upper <br />portion of the TDRs are not grouted and this allows replacement of the TDRs (by <br />drilling out the bottom of the hole) if the cables malfunction. <br />All SMW options include an open case hole with 5 foot sections on the bottom and possibly <br />radioactivity spacers at the joints for access for gamma logging and for observation of breaks in <br />the casing (caliper or down hole viewer.) <br />Natural Soda Inc. requests approval to proceed with options 1. Monitor TDR-3 at 2M-TDR, and <br />2. Design alternative SMW for later in 2003. <br />If there are any questions please contact Plant Manager Kyle Barbot or me. <br />Sincerely, <br />Ed Baker, REM <br />EHS Manager <br />CC: EPA <br />CDMG <br />EPA-Ken Phillips <br />