GENERAL44877 - Laserfiche WebLink

Home Browse Search

= STt~TE iii iiiiiiiiiiiiiiii OF CULUl~vO I DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman St.. Room 215 Denver, Colorado 80203 D t v I s I O N O f Phone: (303) 865-356: MINERAL S FAx: (301) 832-8106 & GEOLOGY RECLAMATION MI NING•SAf ETY April 3, 2001 B~II Ovens Ccvemer Sandra Pau[sky GregE Walther Oakridge Energy, In C. Execmive Dvecror 4613 Jaeksboro Hwy. M~cnzel e. Long Wichita Falls, TX 76301 o~~i:~o" oi~ecr~r Re: Oakridge Energy Inc., CDPS Permit COG-850027 DMR's and Pond Inspection Reports, Permit No. C-92-080 Dear Ms. Pautsky: This letter is to confirm that the Division has received and has reviewed the quarterly sediment pond inspection reports and the quarterly NPDES dischazge reports. The last time I sent a similar letter was for 2nd quarter 1999, so this letter is for the period covering 3rd quarter 1999 to 4'" quarter 2000. The Division has reviewed all of the Dept. of Health's NPDES discharge reports for outfalls 001 and 002 for [he period stated above and with the exception of 4d' quarter 99 (which is missing) finds the NPDES reports have been prepared in compliance with Rule 4.05.13(2)(a)(iii). During this entire report period, at no time did the ponds discharge, therefore, no values exceeded the permit limitations and no problems were noted with the reports. The Division received Carbon Junction Mine's sediment pond inspection reports for the above mentioned period (with the exception of 4'" quarter 99 and I" quarter 00) and although there were times that both ponds had water in them, at no time did they ever discharge. According to the reports, both ponds are stable and free of defects, aze functioning as designed, and have approximately 20% of [he pond's capacity filled with sediment. Upon further review of past sediment pond reports, this same 20% figure for sediment has been used since 1"quarter 1992. Since it is unlikely that [he sediment level has not risen in the last nine years, the Division is concerned that the ponds will no longer hold the designed flows. Therefore, please either have the ponds resurveyed and submit the data to the Division, or have the ponds cleaned out to the original design levels. Additionally, as mentioned in previous correspondence, according to Rule 4.05.9(13): All impoundments shall be examined to assure appropriate maintenance of the structure and for structural weakness, erosion and other hazardous conditions by a qualified registered professional engineer or a qualified individual under their direction. The professional engineer or individual shall be experienced in the construction of impoundments. The inspections shall be made regularly during construction, upon completion of construction and, at a minimum, quarterly thereafter, with the report retained at or near the mine site. A copy of the report shall be submitted to the Division on an annual basis by a registered professional engineer.