HYDRO31091 - Laserfiche WebLink

Home Browse Search

s Mr. Richard Raines Page 3 Middle Poudre Combined Plan -Lafarge West, Inc. January 26, 2007 Based on an aerial photo taken in July 2004, the total exposed surface area at the Greeley 35`h Avenue Pit is 72.3 acres. According to the information submitted, 52 acres of water surface was exposed within the reclamation permit boundary prior to January 1, 1981. This results in 20.3 acres of exposed surface area requiring replacement of depletions from evaporation. The 8.8 acre-feet of water used in concrete production at the Greeley 35`" Avenue Pit is to be appropriated from well permit no. 47856-F. Lafarge West, Inc. filed for water storage right for this site in Case no. 98CW476 and this case is currently pending. The site has been continuously dewatered at a rate of approximately 1200 gallons per minute. Mining at the East Rigden Pit has been completed and construction of a clay reservoir liner is in process on the property. The total exposed surface area at this site is 23.2 acres. According to the information submitted, 25 acres of water surface was exposed within the reclamation permit boundary prior to January 1, 1981. Since the current exposed area is less than the area exposed prior to January 1, 1981, there is no evaporation augmentation requirement at this site, for this approval period. A storage water right for the East Rigden Pit was filed in the Division 1, Water Court in case no. 2001CW202. The Three Bells Pit will include evaporation, water retained in the product and dust control. Mining has re-started at the Three Bells Pit in February 2006 in an area of approximately 20 acres. This site was continuously dewatered at a rate of 1,200 gallons per minute. The Kyger Pit is an active mining site and will continue to include evaporation, water retained in the product and dust control. The mining operation at the Kyger Pit has continuously dewatered directly back to the Cache la Poudre River since 2000. The estimated dewatering rate at the Kyger Pit site is approximately 1,200 gallons per minute. In addition, it should be noted that the only consumptive use at the Port of Entry Pit and Weizel Pit sites is the evaporation of exposed ground water. Mining is complete at the Weizel Pit site. The Port of Entry Pit site is currently undergoing reclamation. Lafarge West, Inc. filed for a plan for augmentation for the Port of Entry Pit site in case no. 2004CW 111 and this case is currently pending. Lafarge West, Inc. also filed for a plan for augmentation for the Weizel Pit site in case no. 2002CW205 and this case is currently pending. The total lagged mining depletions for all the six sites is 433.28 acre-feet. Steady state conditions were used for the Greeley 35`" Avenue and Port of Entry Pits. However, real time depletions were used for East Rigden, Three Bells, Kyger and Weitzel Pits because equilibrium has not yet been reached. Since the Kyger Pit has recently experienced a reduction in the rate of mining, the lagged depletions are higher than the current depletions, as the higher production rate is still affecting the current depletions. Replacements Replacements for this combined plan will come from the following sources: historical consumptive use credit from 475 Boyd and Freeman Ditch shares will cover the summertime depletions at the Greeley 35"' Avenue Pit, accretion credits from recharge of 8.5 shares in the Box Elder Ditch, accretion credits from dewatering at the Three Bells Pit and a lease from the Lake Canal and Reservoir Company ("LCRC") will make additional replacements for the months with insufficient recharge accretion credits.