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After the placement of the TDR and the cement plugs, a temperature survey will be run to <br />establish a base line for this location. The initial baseline temperature survey will be run after <br />allowing sufficient time for cement to cure, but not more than 30 days after placing cement. <br />The TDR will be monitored on a quarterly basis. <br />A temperature survey will be run at any time nearby monitoring indicates the possibility of <br />upward movement of cavity fluid. In any event a temperature survey will run at least every two <br />years. <br />This modification will be an enhancement to the subsidence monitoring program <br />The bonding for this well will remain in place during the time this well is used for monitoring <br />purposes and until the well is finally Plugged and Abandoned. <br />If you have any questions or if further action is required prior to the conversion of this well <br />please contact me at 970-285-0407. <br />Sincerely, <br />E~~o e~Gv~ <br />Environmental Safety <br />and Health Manager <br />cc Kent Walter, Bureau of Land Management <br />Elisabeth Evans, U.S. Environmental Protection Agency <br />Sandy Stavnes, U.S. Environmental Protection Agency <br />