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~~ l._; Illllllllllllllllll ` TWIN PINES INVESTMENT LIMITED PARTNERSHIP sss FALCON ENERGY, INC. GENERAL PARTNER TWIN PINES COAL MINE N2 PHONE 784-3361 P. O. BOX !12059 CANON CITY, COLORADO 81212 December 1 , 19 8 8 p,v ,-,,,~ -T : .-., ~,,, Mr. James C. Stevens, Reclamation Specialist ~-;dl; ,~~r~V.7 Mined Land Reclamation Division Room 423, Centennial $uilding ,:,. ,_;.• •.;; •'~ 1313 Sherman Street [~";`;;;.,;;.,~, ;, . ,.-.~ c Denver, Colorado 80203 ~~~ Subject: Twin Pines No. 2 Mine, Permit No. C-058-83 Dear Mr. Price: In accordance with Stipulation Nos. 1 and 2, as revised by Technical Revision No. 1, to subject permit the "Y7ater Monitoring Report" for the period 5/88 to 11/88 is submitted herewith. The mine continued development in the Third East, and the Second West Sections. Second mining in the Second East Section was resumed in Septem- ber. The entries in the Third East Section were driven to attempt to pick up the water in the old Twin Pines wor}sings and establish a new sump. Due to bad roof conditions the entries were stopped and the Section secured. It appears that entries ended just short of the a:tis of the sycline. Probe holes drilled into the Abandoned Twin Pines Workings showed a water level of about 2 feet in the workings at this point. The coal seam at this point appears to be dipping sharply to the East. Mining to the Northeast of the sump, in the Second East Section, appeared to cross the syncline axis near the old workings. No appreciable water was encountered in this development. It does not appear that the Main Entries have crossed the axis cf the syncline. The estimated pool of water remaining in the abandoned Twin Pines mine and adjacent Cedar Canon wor}sings is shown on the enlarged Section Map, enclosed. With second mining continuing n the Second East Section pumping has now been discontinued in the sump. fi'~_ portion of the pillars were left to prevent a breach of the barrier between the Second East and the old workings. When the main entries cross the axis of the syncl:;_ne a permanent sump will be established in the axis of the syncline. Concerning the clairification requested in a letter from the Division, dated October 5, 1988, the statement "The reservoir level in the abandoned mines increased to the level of the probe into the Cedar Canon Mine which had previously quit running" was not a mistake. The probe hole refered to was the hole directly above the indicated sump location in the pair of entries projecting from Cedar Canon Mine. These entries were not clearly shown as Cedar Canon workings, Flow from this hole did stop after pumping was resumed. The location has been circled on the enlarged Section Map. Discharge from the mine is being monitored in accordance with the require- ments of Stipulation Nos. 1 an 2 and the NPEDS permit. Copies of discharge logs, sample logs, NPEDS reports, and Idine Maps are enclosed.