2010-01-07_HYDROLOGY - M2008082 - Laserfiche WebLink

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Ms. Sira Sartori January 4, 2010 Depletions The total losses for the sites are shown in the following table: TABLE B - LOSSES Page 2 Evaporation Lost in Dust Total Total New Permit Site Name Year Losses Product Control (ac-ft) Lagged Required? (ac-ft) (ac-ft) (ac-ft) (ac-ft) 2010 0.0 0.0 0.0 0.0 0.0 Holton Pit No 2011 0.0 0.0 0.0 0.0 0.0 2010 0.0 0.0 0.0 00 0.0 Morton Lakes 7.36 Yes Pit 2011 1.51 (250,000 1.06 9.93 8.66 tons Total 1.51 7.36 1.06 9.93 8.66 The Holton Pit was not mined in 2008 or 2009 as projected in the previous SWSP for the Holton Pit therefore there are currently no depletions requiring replacement at the Holton Pit. The Morton Pit is a new mining site. In 2010 both the Holton Pit and the Morton Lakes Pit will remain inactive reserve sites. 1n July 2011 stage 1 mining will be initiated at the Morton Pit. The Holton Pit will once again remain inactive in 2011. Ready Mixed would like to maintain an approved SWSP for both sites in 2010 and 2011 as a requirement of their Use by Special Review Permits. Depletions from evaporation and mining operation at the Morton Lakes Pit will impact the Big Dry Creek a tributary of the South Platte River. The depletions have been lagged to the Big Dry Creek using the Glover method and the aquifer parameters shown below: • Location of the site is approximately 600 feet from the Big Dry Creek • The transmissivity is 150,000 gal/day/ft The specific yield is 0.2 The distance of the impermeable boundary is 7,500 feet from the live stream Replacement The proposed source of replacement water for this combined plan during the irrigation season (April through October) is historical consumptive use credit from 1/8th of a share of the Brighton Ditch owned by Holton Family, LLC. All of this ditch interest will be dedicated to this plan. The remainder of the replacement water for this combined plan during both the irrigation and non-irrigation season is a lease of fully consumable water from the City of Fort Lupton of 5.07 acre-feet in 2011. The leased water will be delivered at the Fort Lupton wastewater treatment plant located downstream of the Holton-Morton Pits. No transit loss has been applied to the replacement water due to the location of the replacement delivery. A copy of the lease Agreement with the City of Fort Lupton shall be submitted to this office by July 31, 2011. The 1/8 share of the Brighton Ditch was historically used to irrigate up to 77.2 acres consisting of 50% corn and 50% sugar beets for the period of 1950 through 1968 and 80% alfalfa and 20% pasture grass for the period of 1969 through 2006. For the period of 1950 through 2001 the irrigated land area was reduced by 20% since Mr. Holton stated that during that period approximately 80% of