Laserfiche WebLink
Mr. Vern Pfannenstiel <br />February 11, 2010 <br />b) Use transmissivity values based on well test data (rather than permeameter data) <br />with high and low values bracketed around an expected value of 0.017 ft2/day <br />(SCCC's coal geometric mean on page 2.04-48), and <br />c) Clarify the meaning of "gate road" on page 2.05-70. <br />51. On page 2.05-79, please revise the calculation of recovery time of the potentiometric <br />surface so that it uses the same storage coefficient value of 0.0001 that is used for <br />confined conditions in the mine inflow calculation on page 2.05-70. <br />52. On pages 2.05-82 and 83, please revise the prediction of the duration of elevated <br />TDS in the workings so that it does not use the leaching tests from the Eckman Park <br />Mine. Those tests did not prove true based on the typical spoil leachate TDS of <br />around 4,000 mg/l at Eckman Park upon final bond release which occurred long after <br />1.0 pore volumes of water had passed through the spoil. <br />53. Please resolve the apparent discrepancy between page 2.05-83 (which refers to the <br />mine inflow rate at the end of the 5-year mining period in Figure 2.05.6-F2 and in a <br />preceding calculation), and the referenced table and calculation which do not <br />indicate a rate at the end of the 5-year mining period. <br />54. Please add to the permit application the detailed design for the PSCM Waste Rock <br />Disposal Area demonstrating compliance with Rules 4.10 and 4.11. <br />Please contact me if you have any questions. <br />Sincerely, <br /> <br />Tom Kaldenbach <br />Environmental Protection Specialist <br />Page 5 <br />cc: Dan Hernandez, DRMS <br />Janet Binns, DRMS