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`' <br />'~ AMERICAN <br />SODA, LLP <br />RECEII~ED <br />JAN 0 9 2006 ~ <br />Givision of Minerals and Geology <br />C~.C. <br />~a co©~ w <br />Environmental health and <br />Safely ititanager <br />2717 County Road 215 <br />Parachute, CO 87635 <br />Friday January 6, 2006 <br />Ken Phillips <br />r; 'U.S. Environmental Protection Agency <br />Region VIII <br />999 18t" Street, Suite 300 <br />Mail Code BENF-UFO <br />Denver. Colorado 80202-2466 <br />Re: <br />Dear Ken: <br />Direct Line j970) 285-0407 <br />International Telephone +1 (970) 285-6500 <br />General Facsimile (970) 285-6393 <br />ENV.01.06 <br />Well 20-12 TDR Monitoring 4th Quarter 2005 <br />To maintain historical continuity for TDR Data associated with well 20-12 (C03858-04552) each <br />quarterly report will be added to the previous quarterly report. The following letter will be duplicated with <br />the update of the most recent quarter at the end. - <br />This approach will aNow the reviewer to either view the entire history from the time the TDR was <br />installed to present, or, view only the most recent information by progressing to the end of the report. <br />The TDR Cable installation in Well 20-12 (C03858- 04552). was completed on June 17, 2004. The <br />cable was installed with crimps at the following 21 elevations from surface: <br />32.94' 424.21' 819.49' 1208.84' <br />97.53' 490.09' 885.10' 1275.06' <br />163.53' 556.01' 950.07' 1340.46' <br />229.6' 622.05' 1015.09' <br />295.14' 687.69' 1079.38' <br />359.85' 753.56' 1143.72' ' <br />Prior to grouting the cable in place a reading was taken and all crimps were identified down through <br />1208.84'. A short was detected at 1208.84' and no reading was obtainable from the 1275.06' and <br />1340.46' levels. <br />The cable was grouted in place and another set of readings were obtained. After grouting of the cable a <br />short was detected at an elevation of 1000'. All crimps above 1000' read at the same elevation as the <br />Pre Grout elevations. There was a slight change of approximately .01 units in the Waveform between <br />the Pre Grout and Post Grout readings. <br />CV(~ - 199'-DC~ <br />....~....,__.__.::s::c~: _.,..,. <br />