2012-12-12_HYDROLOGY - M2004013 - Laserfiche WebLink

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Michelle Cunico Johnson, Martin and Wood Page 3 December 12, 2012 Table 2 shows that under Scenario B, the lagged stream depletions during the period January 2013 — December 2013 are estimated to be 25.90 acre -feet and the lagged stream depletions during the period January 2014 — December 2014 are estimated to be 26.10 acre -feet. These estimates are based upon evaporative losses from the settling and washing ponds and mined cell (see attached Table 1 B). REPLACEMENTS The proposed source of replacement water for this pit is a ten year lease to deliver 27 acre -feet annually of fully consumable water from the Board of Water Works of Pueblo ( "PBWW "). The lease water will be provided from the Board's stored water at Clear Creek Reservoir, Turquoise Reservoir, Twin Lakes Reservoir, Pueblo Reservoir, from direct flow transmountain water, reusable return flows from transmountain water, or from any other reservoir or place from which the Board may legally deliver water, and will be delivered to the Arkansas River Near Avondale USGS stream gage. The monthly depletions and replacement requirements are provided on the attached Table 2. A transit loss of one percent was applied to the required monthly replacement amounts, as shown in Table 2. Under Scenario A, estimated replacements are 25.61 acre -feet for the period January 2013 — December 2013, and 26.42 acre -feet for the period January 2014 — December 2014. Under Scenario B, estimated replacements are 26.18 acre -feet for the period January 2013 — December 2013, and 26.38 acre -feet for the period January 2014 — December 2014. CONDITIONS OF APPROVAL I hereby approve the proposed substitute water supply plan in accordance with §37 -90- 137(11), C.R.S., subject to the following conditions: 1. This SWSP shall be valid for the period of January 1, 2013 through December 31, 2014, unless otherwise revoked, modified, or superseded by decree. 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 (currently $257) by November 15, 2014. 2. Well permit no. 62251 -F was obtained for the current use and exposed pond surface area of the gravel pit in accordance with §37 -90- 137(2) and (11), C.R.S. However this permit does not account for the dewatering at the site, under Scenario A. Therefore, upon approval of this SWSP the well permit will be amended to include dewatering at this site. No wells within 600 feet have been identified within the boundary of the exposed ground water. 3. The maximum amount of ground water exposed shall not exceed 9.76 acres, in accordance with Permit No. 62251 -F. Documentation of pond size may be required by the Division Engineer in the form of an aerial photo evaluation or survey by a Professional Land Surveyor during the plan year or years covered by subsequent renewals of this plan. 4. The maximum annual evaporative loss associated with this mining operation shall not exceed 26.16 acre -feet under Scenario A and shall not exceed 26.10 acre -feet under Scenario B, as listed on the attached Tables 1A and 1B.