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999 r ~~ TWIN PINES INVESTMENT LIMITED PARTNERSHIP FALCON ENERGY, INC. GENERAL PARTNER TWIN PINES COAL MINE p2 PHONE ]w~Y7 (1191784' P. O. BOX M2059 CANON CITY, COLORADO 81212 June 2, 1986 ~~~~~~'~~ Mr. Randal P. Price ~~N 7 1958 Mined Land Reclamation Division P~M1INED LAND Room 423 , Centennial Building ~ECLAMA?iON D1V15':tJhi 1313 Sherman Street - 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 "Water Monitoring Report" for the period 11/87 to 5/88 is submitted here with. The mine continued development and started second mining in the Second East Section, adjacent the workings of the Cedar Canon Mine and the original Twin Pines Mine. On March 22 the section was secured and crews returned to development of the main entries. The section will be reopened in September when the domestic coal season returns. (See enclosed enlarged map of the section). During the period water was pumped from the sump at the probe hole near the old Twin Pines Workings. In January it appeared that the reservoir in the abandoned mine was not receding. The pump in the sump was connected directly to the discharge line from the mine, which increased the rate from 20 gpm to 38 gpm. (Previously the water was pumped to another sump in the mine, then to surface). From November to January 21, 960,44D gallons were pumped from .the mine at an average rate of 8.2 gpm. From January 21 to May 25, 4,126,2100 gallons were pumped at an average rate of 22.9 gpm. Pumping was suspended from March 10 to March 22 and pumps moved to dewater areas where it had accumulated while the section was being mined. During this period it was noted that the reser- ~ voir level in the abandon_ed~¢ines increased to the level of the probe ~~' hole into the [;Ceder Canon Mine~c.hich had previously quit running. When tl~~ pumping was resumed the reservoir level receded and the probe hole to Q/ Cedar Canon quit running. The sump has been pumped continuously Bence pumping resumed. Additional test holes drilled into the reservoir indicate that the level is not appriciably receding. It appears that the flow into the reservoir has increased Bence it was originally tapped. This theory is supported by the results of conductivity tests and the change in odor of the water. When first tapped, a very noticible sulfur odor was noted. There is now no odor detectable. The conductivity of the water has de- creased from 1600 /cm to 750 /cm. The level in monitering well TPW-1 cannot be correlated with the increased flow into the mine. Discharge from the mine is being monitored in accordance with the requirements of Stipulation Nos. 1 an 2 and the NPEDS permit. Copies of discharge logs, sample logs, NPEDS reports, and Mine Maps are enclosed. The mine water discharge was sampled by the Division January 28,1988.