REP11398 - Laserfiche WebLink

Home Browse Search

I~~'I~I~~'I~II~~ I~~ 999 P, O. BOX fY2069 "^: °- CANON CITY, COLORADO 87212 ~ ~ ~ ~ _ " ..... TWIN PINES INVESTMENT LIMITED PARTNERSHIP FALCON ENERGY, INC. GENERAL PARTNER TWIN PINES COAL MINE 7f2 PHONE 78a-3361 ~•.~ -~~ IJ.~iJ June 15, 1989 Mr. William B. Crick, Reclamation Specialist Mined Land Reclamation Division Room 215, Centennial Building 1313 Sherman Street Denver, Colorado 80203 Subject: Twin Pines No. 2 Mine, Permit No. C-058-83 Dear Mr. Crick: 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 12/88 to 6/89 is submitted herewith. Second mining in the Second East Section was completed during the period. During this phase of mining water accumulated in the pillared workings and was pumped at various locations until the section was sealed. At this time water does accumulate behind the seals and is pumped on a regular basis from valved pipes through the southerly seal. With completion of mining in the Second East Section, development of a second main intake was started from the Second West Section and parallel to the main intake. Development of the main entries is continuing concurrent with the new intake. Little additional water has been encountered with this develop- ment. Small amounts of water does accumulate in the noted Swale in the main return entry. Sufficient evidence has not been noted to conclude that the entries have crossed the Chandler Syncline, although all of the entries have started uphill near the projected axis. When it is evident that the syncline axis has been crossed permanent sumps will be establish- ed to control mine water. From pumping records it does not appear that discharge from the mine has increased. iUnderground storage in the pil- lared section and the old Twin Pines and Cedar Canon works makes mine intake comparisons impractical). 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 Mine Maps are enclosed. Water level measurements and associated data for the water monitoring wells for the reporting period are as follows: T W-1 CAL DIROLA N0. 2 DATE: 10 /22/88 2/13/89 5/4/89 10/22/88 2/13/89 S/4/84 ------------- ------- --------- -------- -------- ---------- ------ ------------- CONDUCTIVITY ------- 780 --------- 760 -------- 750 -------- 750 ---------- 660 ------ 660 PH 8.5 8.5 8.2 7.8 7.5 7.5 LEVEL 147.7 147.0 146.6 82.3 84.D 83.5 TEMPERATURE 54 F 53 F 53 F 54 F 52 F 53 F