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AMERICANn~ <br />SODA, LLP~" <br /> <br />2777 County Road 215 <br />Parachute, CO 81635 <br />Tuesday September 12, 2006/ <br />Ken Phillips `//~~ nK/ <br />U.S. Environmental Protection Agency <br />Region VIII <br />999 187h Street, Suite 300 <br />Mail Code 8ENF-UFO <br />Denver, Colorado 80202-2466 <br />Dear Ken: <br />e~ f e <br />AY ~g+. <br />- -. <br />SFP 182paS <br />Division otR`'c7anlatio <br />~inin9 and Safaty n' <br />ENV.50.06 <br />Re!' Well 20-12 TDR Monitoring 3rd Quarter 2006 <br />To maintain historical continuity for TDR Data associated with well 20-12 (CO3858-04552) 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 (CO3858- 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 />`'M-199-c~~~. H~ <br />Ed Cooley <br />Environmental Health and <br />Safety Manager <br />Direct Line (970) 285-0407 <br />International Telephone +1 (970) 285-6500 <br />General Facsimile (970) 285-6393 <br />Delivering a Crystal Clear Ad-van~age <br />www.americanscda.ccm <br />