2016-02-02_HYDROLOGY - M2011049 - Laserfiche WebLink

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Partners Combined SWSP Page 4 of 6 January 27, 2016 and Treiber Lake A have been approved by this office. Kyger Reservoir is filled with water diverted from the Cache la Poudre River via the New Mercer Ditch, Larimer County Canal No. 2, the Overland Trail Diversion Structure, Munroe Gravity Canal (a/k/a North Poudre Supply Canal), and/or the Pleasant Valley Pipeline. The total decreed capacity of the Overland Trail Reservoirs is 10,962 acre- feet, conditional. According to your November 30, 2015 letter, the Partners had stored approximately 257.3 acre-feet of water in the Overland Trail Reservoirs under 00CW251. Replacement water from the Overland Trail Reservoirs is proposed to be pumped into the Cache la Poudre River at approximately the same location as the Treiber Lakes and Lamb Lakes. The total amount of replacement water to be released is 195.9 acre-feet for 2016 and 154.3 acre-feet for 2017. See Table 6 for the projected monthly replacement schedule. Long Term Augmentation In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado Division of Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the protection of water resources. To prevent long term injurious stream depletions that result from mining related exposure of ground water, future operations will include constructing slurry walls around each of the five ponds to construct water storage reservoirs. The Partners obtained a conditional water right for these future reservoirs (collectively known as the Overland Trail Reservoirs) in water court case no. 00CW251. The owners and operators of the mining site are municipal entities and thus a bond to cover the cost of lining or backfilling the pits is not required. Conditions of Approval I hereby approve the SWSP in accordance with 5 37-90-137(11), C.R.S., subject to the following conditions: 1. This plan shall be valid for the period of January 1, 2016 through December 31, 2017, unless otherwise revoked or modified. If this plan will not be made absolute by a water court action by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee of $514 (2 DRMS permits x $257) no later than November 15, 2017. 2. Well permit no. 75423-F was obtained for the Home Office Pit by Lafarge to cover their use and exposed pond surface area of the gravel pit in accordance with 5 37-90-137(2) and (11), C.R.S. This permit is now held by Martin Marietta Materials and currently covers evaporation from the three Lamb Lakes that are the subject of this SWSP. 3. Well permit no. 77301-F was obtained for the current use and exposed pond surface area of the Treiber Lakes in accordance with S 37-90-137(2) and (11), C.R.S. 4. The total surface area of the groundwater exposed in the Lamb Lakes after December 31, 1980 must not exceed 61.8 acres, which results in an evaporative loss of 141.19 acre-feet per year. The total surface area of the groundwater exposed in Treiber Lake B must not exceed 25.6 acres through May 2016 and 0 acres after May 2016, which results in an evaporative loss of 16.69 acre-feet for 2016 and 0 acre-feet for 2017. Should the total surface area exposed exceed these amounts, an amendment will need to be filed with this office. 5. The amount of water used for slurry wall construction at Treiber Lake B shall not exceed 20 acre-feet. All pumping for slurry wall construction shall be measured in a manner acceptable to the division engineer. 6. Total consumption at the Treiber Lakes and Lamb Lakes must not exceed these aforementioned amounts unless an amendment is made to this plan.