2011-02-08_HYDROLOGY - M2001107 - Laserfiche WebLink

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Michelle L. Hatcher February 7, 2011 Page 2 Depletions The anticipated total consumptive use for this plan is 52.8 acre-feet per year for up to 9.75 acres of exposed water surface. Table 3 contains monthly values for consumptive use attributable to evaporation, dust control, and water content of mined product. These monthly values add up to annual totals of 29.0 acre-feet of evaporative loss, 6.2 acre-feet of water used for dust control, and 17.6 acre-feet of water lost with 600,000 tons of mined product. The IDS AWAS stream depletion model was used to determine the lagged depletions to the South Platte River. The following parameters were used in the model: transmissivity (T), 150,000 gallons per day per foot; specific yield (SY), 0.2; distance from the South Platte River to the edge of the alluvium (W), 5,000 feet; and distance from the centroid of the exposed surface water areas to the South Platte River (X), 3,300 feet. Replacements The source of replacement water is fully consumable water leased from Thornton. The leased water from Thornton will be released from the Metropolitan Wastewater Treatment Plant ("Metro"). A 0.5% per mile transit loss (14% overall loss for the 28 miles between Metro and the point of depletion) was accounted for in the SWSP. The quantity of replacement water needed for this plan in 2011 is 55.3 acre- feet. Thornton is the owner of the NCCI Pit #1 site and will continue to make replacement for depletions at the NCCI Pit #1 site. The lagged depletions include depletions resulting from past uses at the site, and the replacements are shown on attached Table 4. Conditions of Approval I hereby approve the proposed substitute water supply plan in accordance with Section 37-90- 137(11), C.R.S., subject to the following conditions: 1. This SWSP shall be valid for the period of January 1, 2011 through December 31, 2011, unless otherwise revoked, modified, or superceded by decree.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 by November 15, 2011. 2. An application has been received for a new well permit (receipt no. 3648161) to replace permit no. 67235-F for the gravel pit pond in accordance with §37-90-137(2) and (11), C.R.S. A new permit is necessary for proper representation of the actual use and exposed pond surface area under the current plan of operation. The provisions of §37-90-137(2) prohibit the issuance of a permit for a well to be located within 600 feet of any existing well, unless the State Engineer finds that circumstances so warrant after a hearing in accordance with the procedural rules in 2CCR402-5. The hearing will be waived if you are able to obtain statements from the owners of all wells within 600 feet, verifying that they have no objection to your use of the proposed well. Should a new well permit be denied for reasons of the 600 foot spacing, or any other legitimate reason, approval of this amendment will be canceled.