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r~ <br />S`ENECA <br />Coal Company <br />April 26, 2007 <br />Mr. Mike Boulay <br />Division of Reclamation, Milling and Safety <br />101 South 3~, Suite 301 <br />Grand Junction, CO 81501 <br />RE: Yoast Mine (Petnut No. G94-082) <br />Technical Revision No. 34 (TR-34) <br />Hydrology Monitoring Program Changes <br />Dear Mr. Boulay: <br />Seneca Coal Com <br />RECEIVED <br />r~aY o a Zoos <br />Qt'v'". vni t23 t2?e'{8R13liOn. <br />ia~•N) ddY.9 SettetY <br />Enclosed are two (2) copies of an application for a technical revision to the Yoast Mine Permit (G94- <br />082). A third copy has been sent to the Division's Denver Office also addressed to yvu. TR-34 <br />requests changes to the hydrology monitoring program as described below. <br />Due to the closing of the Yoast Mine, SCC has requested a reduction in monitoring frequencies of <br />streams, springs and wells. These reduced monitoring frequencies will be continued until a year or two <br />before final bond release, at which time monitoring frequencies will be increased. The details of the <br />changes are provided below. <br />For ground water monitoring wells, the frequency of water level tt~asurements has been changed from <br />tri-annual to semi-annual (May/June and September/October). Water quality sampling frequency of all <br />wells will remain unchanged. <br />Water quality sampling will be discontinued at Well YSALB. This well is in the Sage Creek alluvium <br />between the discharges of Ponds 012 and 013. This well is not used for the PHC analysis. Table 15-8, <br />Ground Water Monitoring Frequencies (pages 22 and 23, Tab 15), has been revised to reflect these <br />changes. <br />For stream sites, monitoring at YSS2 (Sage Creek below Pond 012) have been changed from monthly <br />to tri-annual (spring rwtoff,pnst-runoff and baseflow). For spoil springs, monitoring has been changed <br />from semi-annual to annual (May- July). Three newspod springs (k 2, 3 and 4) have been included <br />into the monitoring program Table 15-9, Surface Water Monitoring Frequencies (page 24, Tab 15), <br />has been revised to reflect these changes. <br />Attached are the requirrd application form, public notice, insenion instmttions, and the <br />revised/updated material. Should you or any other member of the Division have questions regarding <br />the information, please contact Dennis Jones at (970) 276-5209. <br />Seneca Coal Company • P.O. Box 670 • Hayden, Colorado 81639 <br />Telephone (970) 276-3707 • FAX (970) 276-3014 <br />