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Environmentnl Consulfnnts, lnc. <br />Mazch 6, 2000 <br />uinu 111111111111 <br />RECEIVED <br />Mr. Tom Kaldenbach MAR 13 2000 <br />Environmental Protection Specialist <br />Division of Mineral and Geology Division of Minerals & Geology <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Kaiser Ventures, Inc., Permit No. C-S1-023 1997 Annual Hydrologic Monitoring <br />Report, Comment Responses (TR-31). <br />Dear Mr. Kaldenbach: <br />The above-referenced report has been revised to reflect the comments made by the Division in <br />the correspondence of November 22, 1999. A Technical Revision Form and draft Public Notice <br />is also attached for your review and approval. As you review the revised PHC you will note the <br />following salient points (in the order of the DMG correspondence of November 22): <br />2. Projection of the length of time of elevated TDS discharge has been included within the <br />revision and is based upon the methodology of Williams and Clark (page 5). <br />3. The TDS maximum concentration estimation is also based upon the methodology <br />Williams and Clark and is included on Page 4. <br />4. The porosity as utilized originally has been updated to the value of 15%. <br />5. A calculation of the resaturation of the pit is included on Page 4. <br />6.. The reference Piteau and Associates, 1982 is found within the Chimney Rock Coal <br />Permit Application Volume N Section 32, dated February 6, 1981. <br />7. The hydraulic conductivity calculated was the result of a transpositional error from the <br />Piteau reference into the calculation that was carried throughout the document. This <br />value has been revised. <br />Greystone appreciates the cooperation of the Division with this project. Should you have any <br />questions or require further information, please do not hesitate to contact me at (303)-850-0930. <br />Sincerely, <br />~~~~ / <br />Jeny Koblitz <br />Principal <br />5231 South Quebec Sircet • Greenwood Village, Colorado 801 I I <br />Phone (303) 850-0930 • Fax (303) 721-9298 <br />Web Site: www.grcystone-consultanU.com • E-mail: greystone@greystone-consultants.com <br />