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Ms. Kimberly Edwards June 25, 2007 Page Z The lagged effects of ground water depletions were estimated using a Glover analysis and the fallowing assumptions: 1) Distance from the centroid of the gravel pit to the stream was 1,700 feet, 2) the transmissivity was 50,000 gpolft., 3) the specific yield was assumed to be 0.2, and 4) the impermeable boundary distance was estimated to be 2,625 feet. The proposed source of replacement water for depletions created by this operation is a water lease agreement with Upper South Platte Water Conservancy District ("District"}. This lease provides far a total of 11 acre-feet of replacement water, which is projected to be for 5 acre-feet for genera( use and 6 acre-feet for road construction of Park County Road 77. The agreement was dated August 30, 2006 and is valid until January 1, 2009. A monthly breakdown of the annual depletions, which include 1.45 acre-feet of net evaporative loss (using an assumed ice cover period of November through March) and 0.5 acre-foot of water used for dust control can be found on the attached Table 1. The depletions from the operation of the Ansley Plat Pit will be replaced from the 5 acre-feet of general use water leased from the District. The District currently operates under an SWSP approved by the State Engineer. The District's SWSPrs currently valid until October 10, 2007 and a renewal request has been submitted for 2008 and is currently pending evaluation by the State Engineer's Office. 1 hereby approve the proposed SWSP in accordance with Section C.R.S. §37-90-137(11), subject to the following conditions: 1. This SWSP is approved with the effective date of April 1, 2007 and shall be valid through December 31, 2008 (to be consistent with the term of the District's lease agreement). If this SWSP wilt not be made absolute by a water court action by the SWSP's expiration date, a renewal request must !x: submitted to this office with the statutory fee (currently $257) rto later than November 15, 2008. 2. A well permit must be issued for the gravel pit in accordance with C.R.S. § 37-90-137(2) and (11}for the exposure and use of groundwater. A gravel pit well permit application (receipt no. 3614611) was submitted to this office on March 23, 2007 and is under review at this time. The provisions of C.R.S. § 37-90-137(2) prohibit fhe 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 held in accordance with the procedural rules in 2 CCR 402-5. This hearing may 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 600 foot spacing, or any other legitimate reason, approval of this SWSP will be cancelled. 3. The total surface area of the groundwater exposed after January 1, 1981 at the Ansley Flat PR must not exceed 0.80 acres during the approval period of this SWSP and the annual evaporative loss is estimated as 1.45 acre-feet (using an assumed ice cover period of November through March). 4. The annual amount of water used for dust control at the Ansley Flat Pit shall not exceed 0.5 acre-feet per year. 5. In the event that more than 0.5 acre-feet per year is used for dust control, or more than 0.80 acres of surface area of groundwater is exposed after January 1, 1981, Applicant is required to immediately file an amendment to this SWSP to include such increased amounts. 6. Approval of this SWSP is for the purposes as stated herein. Any additional uses of this water must first be approved by this office.