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.'~ <br />r <br />AMERICAN <br />SODA, LLP <br />m 949 ooa <br />ESG <br />~a r_oole~. <br />Environmental Health and <br />Safety Ytanager <br />2717 County Road 215 <br />Parachute, CO 81635 <br />RECEIVED <br />OCT 2 42005 <br />Division of Minerais and Geology <br />Thursday October 20, 2005 <br />Ken Phillips <br />U.S. Environmental Protection Agency <br />Region VIII <br />999 18`h Street, Suite 300 <br />Mail Code 8ENF-UFO <br />Denver, Colorado 80202-2466 <br />Dear Ken: <br />Direct Line (970) 285-0407 <br />International Telephone +1 (970) 285-6500 <br />General Facsimile (970) 285-6393 <br />ENV.89.05 <br />Re: Well 20-12 TDR Monitoring <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 allow 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 />~eiverir_a a Crvs~a Clear P.cva^~aqe <br />Div o/. am=_r~cansoda. ccm <br />