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STATE OF COLORADO OFFICE OF THE STATE ENGINEER Division of Water Resources Department of Natural Resources 1313 Sherrnan Street, Room 618 Denver, Colorado 80203 Phone (303) 866-3581 FAX (303) 866.3589 April 10, 2007 RECEIVED /APR;10 2001 oF.~i,O<~o ~~ ~ ~e 4:~7K~ ,a~~?~. s bra ~/H 16~ http://www waterstate.co.us Division of Reclamation, Go error Jr Mining and Safety Mr. Forrest Leaf, P.E. Hartiso. Sherman Executive Director Leaf Engineering, Inc. P.O. BOX 336714 Hal D. Simpson, P.E. State Engineer Greeleyy, Co 80631 t/~T~~(e Re: Substitute Water S~f21y Plan, Nissen Pit (DRMG #M-2003-001) Section 12, T5N, R65W, 6th P.M. Water Division 1, Water District 2, Weld County Approval Period: January 1, 2007 through December 31, 2007 Contact Phone Number for Mr Forrest Leaf.' 970-351-0210 Dear Mr. Leaf: Your letter dated September 5, 2006, requesting renewal of the above referenced substitute water supply plan to cover depletions caused by an existing gravel mining operation have been reviewed. The required fee of $257 for the renewal of this substitute water supply plan has been submitted. The original plan was approved in a letter dated October 15, 2003 and it was most recently renewed on October 31, 2005. Mining at the Nissen Pit did not commence as originally anticipated due to aggregate sales at the operator's other aggregate mines. The mined area was lined with a slurry wall during 2003 however, the slurry wall has not yet been approved for compliance with the State Engineer's Office lining guidelines. In 2007 it is anticipated that the aggregate production will commence at a rate of 250,000 tons of product annually. A concrete batch plant is anticipated to be added in a future request for a substitute water supply plan. The anticipated net depletion at this site for 2007 is 22.78 acre-feet. There will be 4.2 acres of water surface exposed after December 31, 1980 (4 acres silt pond and 0.2 acres of dewatering trenches). According to the information submitted, no water surface was exposed within the reclamation permit boundary prior to January 1, 1981. No phreatophyte credit has been applied to this plan. A stream depletion model ("IDS AWAS Model") was used to determine the lagged depletions to the Cache La Poudre River. The following parameters were used in the model: transmissivity (T) = 250,000 gallons per day per foot, specific yield (SY) = 0.2, the distance of the exposed ground water to the river X =1,270 feet, and the distance from the river to the aquifer boundary W = 14,535 feet. Based on the model, the lagged stream depletions from evaporation and product moisture loss are estimated to be 16.59 acre-feet (Table 2a). An alluvial well will provide water for dust suppression. The applicant has obtained well permit no. 61691-F, and this permit was valid until September 16, 2006. Since the well was not constructed prior to the well permit expiration date, a new well permit must be obtained for industrial purposes for concrete production and dust control in accordance with §37-90-137(2), C.R.S. This well is proposed to be located outside of the boundaries of the slurry wall. Lagged stream depletions from this well were estimated using the IDS AWAS Model. The following parameters were used in the model: transmissivity (T) = 280,000 gallons per day per foot, specific yield (SY) = 0.2, the distance from the well to the river X =1,405 feet, and the distance from the river to the aquifer boundary W = 14,535 feet.