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AMERICAN <br />SODA,LLP <br />Ed Cooley <br />Environmental Health and Safety <br />Manager <br />2717 County Road 215 <br />Parachute, CO 81635 <br />Thursday, April 14, 2005 <br />Ken Phillips <br />U.S. Environmental Protection Agency <br />Region VIR <br />999181M1 Street, Suite 300 <br />Mail Code SENF-UFO <br />Denver, Colorado 80202-2466 <br />Dear Ken: <br />app i C 2C05 <br />Cl• `., ~,:, of .:.:~~ ti [,antes <br />ENV.44.05 <br />Re: Well 20-12 TDR Monitoring <br />Direct Line (970) 285~74W <br />International Telephone .1 (970) 285x500 <br />General Facsimile (970) 285x393 <br />To maintain historical continuity for TDR Data associated with well 20-12 (C03858-04552) each quarterly report will be added <br />to the previous quarterly report. The following letter wilt be duplicated with 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 installed to present, or, view <br />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 cable was installed with <br />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 1208.84'. A short was <br />detected at 1208.84' and no reading was obtainable from the 1275.06' and 1340.46' levels. <br />The cable was grouted in place and another set of readings were obtained. After grouting of the cable a short was detected at <br />an elevation of 1000'. All crimps above 1000' read at the same elevation as the Pre Grout elevations. There was a slight <br />change of approximately .01 units in the Waveform between the Pre Grout and Post Grout readings. <br />Delivering a Crystal Clear ?.dvaatage <br />www.americansoda.com <br />