2012-04-25_HYDROLOGY - M1977560 (2)

Home Browse Search

Mr. Luke Harris April 23, 2012 the lagged effects have been calculated using the Glover -based ISD AWAS. The monthly distribution of the values, and the lagged affects on the Arkansas River, are detailed on the attached Table 3. As stated in the request letter, Thomas E. Brubaker, President of Valco, has indicated that Valco's June 2012 through May 2013 operations will be similar to the projected June 2011 through May 2012 operations presented in the attached Tables 1 — 5. Pit Evaporation Projected Well Material Washing Total (AF) Depletions (AF) (AF) Consumption (AF) Canon City East Rocky Ford East Lamar East 45.57 120.20 92.21 0.00 0.00 0.00 0.00 1.41 0.00 45.57 121.61 92.21 Replacements Conditions of Approval Page 2 It is anticipated the replacement water will be provided from four sources: The Rocky Ford Ditch, the Pueblo Board of Water Works, LAWMA and the Canon City and Oil Creek Ditch. Valco owns two shares of the Rocky Ford Ditch, which you have estimated yield 25.72 acre -feet annually. Valco also has a 15 year lease (through June 15, 2013, extendable for one 10 year period) for 250 acre -feet per year of consumable water to be obtained from the Pueblo Board of Water Works (PBWW). Valco has obtained 8 common LAWMA shares which will be used to replace depletions at the Lamar East Pit. These shares' allocations vary from year to year, depending on the percent set by LAWMA. For 2011, the common share allocation is 100 %; therefore, the 8 common shares will yield 8 acre -feet in 2011. Valco has also purchased 90 Preferred LAWMA shares yielding 90 acre -feet of water, which will be used for replacement at the Lamar East Pit. Lastly, Valco will use 25 shares of the Canon City and Oil Creek Ditch, which you have estimated will yield 38.34 acre -feet annually. Rocky Ford Ditch credits will first be applied to depletions at the Rocky Ford Pit, which will be delivered directly to the Arkansas River using the City of Aurora's augmentation station. The lagged depletions at the Rocky Ford Pit will be reduced by irrigation- season credits associated with the historic consumptive use of these shares, with the non - irrigation season depletions replaced with PBWW lease water. The leased PBWW water may come from any available PBWW source, and the PBWW will apply the appropriate transit losses from the source to the appropriate pit. You state that most likely the PBWW will make releases at or below Pueblo Reservoir. Replacement using LAWMA shares will be first applied at the Lamar East Pit site. The operational scenario giving monthly depletions and replacements is detailed on your attached Table 5. Depletions at the Lamar East Pit site from November through March shall be added to the Post -1985 depletions LAWMA is responsible for at the state line. This substitute water supply plan is hereby approved pursuant to Section 37 -90- 137(11), C.R.S., subject to the following conditions: 1. This SWSP shall be valid for the period of June 1, 2011 through May 31, 2013, unless otherwise revoked, modified, or superseded by decree. Should an additional SWSP be requested, such renewal request must be submitted to this office with the statutory fee of $257 per gravel pit at least 45 days prior to the expiration date of this plan. 2. No more than 30.1 acres (14.7 acres of post -1981 exposure) of ground water may be exposed at the Canon City East Pit, nor more than 47.3 acres (29.9 acres of post -1981 exposure) of ground water may be exposed at the Rocky Ford East Pit nor more than 35.4 acres (22.2 acres of post - 1981 exposure) may be exposed at the Lamar East Pit during this plan year without first obtaining an amendment to the plan. The above acreage totals include any surface areas in ponds to