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Attached is a graphical representation of the TDR test with the coaxial cable crimps <br />indicated. <br />ASLLP speculates that the hydrostatic pressure of the water within the 7" casing <br />deformed the coaxial cable at a depth of 1209' resulting in a short circuit. Subsequent <br />hydrostatic pressure associated with the 15,6 Ib/gallon cement deformed the coaxial <br />cable at a depth of 1000' resulting in an additional short circuit. <br />The cable test of 7/1 /2004 indicates that 1000' of the coaxial cable and 15 reference <br />crimps are fully functional for subsidence monitoring. ASLLP proposes that the 7/1 /2004 <br />reading be used as the baseline reading with subsequent readings to be performed <br />every 90 days. <br />Future ASLLP TDR installations should be performed in a manner which limits the <br />hydrostatic pressure to which the coaxial cable is exposed to less than 500 psi, <br />ASLLP will test the TDR in Well 20-12 on quarterly time intervals and forward the <br />information to your agency. <br />Should you have any questions or require more Information concerning this matter <br />please contact me at 970-285 -0407, <br />Sincerely, <br />C / /~~ <br />Ed Cooley <br />Environmental Health <br />and Safety Manager <br />cc: Kent Walter/BLM <br />Elisabeth Evans/EPA <br />Erica Crosby/CDMG <br />