Laserfiche WebLink
Poudre Pits SWSP December 3, 2019 <br /> Plan IDs 3218 Et 4585 Page 5 of 9 <br /> Table E - Summary of Dewatering Impacts (acre-feet) <br /> Pre-2019 Pumping Post-2019 Pumping <br /> (infinite aquifer method) (alluvial aquifer method) <br /> Site Lagged Lagged Wrapped Direct Lagged Lagged Net <br /> Name Accretions Depletions Depletions Returns Accretions Depletions Balance <br /> North La 2 28a -6.07 -3.97 N/A N/A N/A -7.76 <br /> Poudre <br /> La Poudre 5.87 -16.79 -3.83 319.2 144.55 -438.87 10.13 <br /> Total 8.15 -22.86 -7.80 319.2 144.55 j -438.87 2.36 <br /> a Excludes accretions from any dewatering recharge that may have occurred in 2012 <br /> The combined lagged dewatering depletions, accretions from the stated recharge, and direct <br /> delivery to the river from dewatering operations create a net credit to the river in the amount of <br /> 2.36 acre-feet. With the stated combined lagged evaporative and operational depletions of 79.35 <br /> acre-feet, the total net depletion owed to the river for this SWSP approval period is 76.99 acre-feet. <br /> See attached Table 4 for the monthly distribution of depletions and accretions. <br /> Replacements <br /> The proposed source of replacement water under this SWSP is water leased from the Central <br /> Colorado Water Conservancy District. <br /> The Applicant has obtained a lease with the Ground Water Management Subdistrict of the <br /> Central Colorado Water Conservancy District ("Central") for 76.99 acre-feet of Central's fully <br /> consumable storage and direct flow water rights in the Cache la Poudre basin. The term of the lease <br /> is January 1, 2020 through December 31, 2020. A copy of the signed lease, dated November 29, <br /> 2019, is attached. Central has water in storage in Siebring Reservoir (WDID 0303803), 83rd Avenue <br /> Reservoir (WDID 0303408), and La Poudre Reservoir (WDID 0303377). Siebring Reservoir and 83rd <br /> Avenue Reservoir are located in Section 31, Township 6 North, Range 66 West of the 6th P.M. La <br /> Poudre Reservoir is located within the boundaries of the La Poudre Aggregate Mine (M-1983-090) in <br /> Section 19, Township 6 North, Range 67 West of the 6th P.M. If the Whitney Ditch or B.H. Eaton Ditch <br /> are sweeping the river, Central lease water from La Poudre Reservoir can be used to cover the <br /> depletions from the La Poudre and North La Poudre Pits, but the Central lease water from Siebring <br /> Reservoir and 83rd Avenue Reservoir cannot. <br /> Conveyance loss for delivery of the augmentation water referenced above is subject to <br /> assessment and modification as determined by the division engineer. <br /> Long-Term Augmentation <br /> In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado Division <br /> of Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with <br /> the requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the <br /> protection of water resources. The April 30, 2010 letter from DRMS requires that you provide <br /> information to DRMS to demonstrate you can replace long term injurious stream depletions that <br /> result from mining related exposure of groundwater. <br />