Laserfiche WebLink
1~11.2~~~9i TL~E lO:Ja FMS JOJ 782 <br /> <br />~+E/VEC <br />`17 co.~ comwar <br />CDPHE ~~qCU <br />f~ 002 <br />III III'lllllllll'll <br />NOV OB 1997 I Seneca Coal Co <br />1, 1997 <br />Industrial Permits and Enforcement Program <br />Colorado Department of Health <br />WQCD-PE-82 <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />Attn. Carla Lenkey <br />RE: Vpaet Coaditioa at Discharge Poiat 006, Perait No. CO-0000221 <br />Dear~Ms. Lenkey,~ <br />Per our phone conversation yesterday, this letter serves to update <br />your Division of the status of the upBet Condition at Pond 006 <br />reported to you originally in a letter dated September 26, 1997. <br />The rainfall event referenced in that letter amounted to 4.36 <br />inches from September 18CR to the 22n°. This is equivalent to 26 <br />percent of the average annual amount observed at the NOAH Hayden <br />-. Weather Station located seven miles away. The highest 24 hour <br />total was 1.80 inches, which was above the 10 year, 24 hour event <br />in this area of 1.70 inches. The 100 year, 24 hour event for this <br />area is 2.50 inches. <br />As a result of this high rainfall, this sediment pond was filled <br />with sediment to within one foot from the principal spillway <br />elevation. In order to facilitate the removal of this sediment, a <br />ditch was dug through the dam at an elevation of about one foot <br />below the principle spillway in order to remove the remaining <br />water. This ditch started to discharge water at 2 PM on October <br />29c°, and was filled back in today at 10 AM. During that period, <br />approximately 1.5 acre-feet of water was discharged. A sample of <br />_ this water was collected at noon on the 30`". Although_ no lab <br />results are Back yet, it is certain that the water discharged <br />exceeds the effluent limits for suspended solids and total iron. <br />Now that the ditch through the dam has been backfilled, any water <br />entering the pond will once again be discharged through the <br />principle spillway. Sediment removal has begun around the <br />principle spillway first, and will proceed until as much sediment <br />as possible is removed fzom the pond. This will take about a month <br />to complete. Please feel free to call me at 970-276-5109 if you <br />~ have any questions. <br />Sense Coel Company • P.O. prewar D • Hayden, Colorado 81839 <br />Telephone (970) 276.3707 • FAX (97D) 276-304 <br />