Laserfiche WebLink
/ \`` <br />TWENTYMILE COAL COMPANY <br />29515 ROUTT COUNTY ROAD 27 <br />OAK CREEK, COLORADO 80467 <br />September 30, 1999 <br />Janet Binns <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: Technical Revision No. 99-32, PHC Revision <br />Permit No. C-82-056 <br />Dear Ms. Binns: <br />RECEIVED <br />OCT 051993 <br />Division of Minerals 8 Geology <br />The attachments provide TCC's responses to the concerns raised in the Division's letter of <br />August 11, 1999. I have not listed each concern and associated response due to the fact that it <br />was mainly focused on format changes and minor text changes. I believe the changed materials <br />will allow for easy substitution into the existing application package. <br />In reference to Exhibit 14, Hydrologic Monitoring, the attachment serves to replace the existing <br />exhibit. Table A has been consolidated to show the current and proposed monitoring sites, and <br />historic information no longer relevant to the program is eliminated from the exhibit. I believe <br />this makes the exhibit more concise and easier to interpret. <br />to reference to salt loading downstream, as it relates to material damage of AVF's, of TCC's <br />discharge points the text as been expanded to reflect how the Fish Creek Borehole calculator is <br />used to eliminate this potential concern. The Division is awaze of this tool and how TCC uses it <br />to manage discharge from the mine to control impacts to the downstream AVF's. With this in <br />mind, an example was provided as to how the calculator is used to determine discharge from the <br />mine based upon water quality and flow data from the creek and the quality of the effluent. <br />TCC's commitment to use the calculator negates the potential for material damage to the AVF's. <br />If there aze further questions, please contact me at your convenience. <br />Sincerely, <br />~t.~ ~~~~~II~ <br />'chard Mil <br />Environmental Manager <br />Attachments <br />Cc: Routt County Clerk and Recorder <br />File: I;\en\environmental\revison\tech-r\tr9932aderesponsecl.doc <br />