2011-03-30_HYDROLOGY - M1978056 (2)

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Cheryl Signs, P.E. Page 3 Kurtz Pit, DRMS-1999-006 Computation of evaporation under this plan was also reduced during the ice covered period. You have assumed the ice covered period to occur during the months of January, February and December, based on the average temperatures of 26.5°F for January,' 31.0°F for February and 29.7°F for December, taken from the Longmont weather station. However, for the purpose of this SWSP, the Applicant shall replace the net evaporation depletions from the exposed ground water surface area that may occur during the assumed ice covered period (the months of January, February and December) for any time that the pit is not completely covered by ice. The IDS AWAS stream depletion model was. used to determine the lagged depletions to the Saint Vrain Creek. The aquifer characteristics used in the model are: transmissivity (T)= 100,000 gallons per day per foot and specific yield (SY)= 0.28 (based on the USGS Water Supply Paper 1662D). The nearest stream is a natural drainage ditch that originates uphill from the site and flows continuously through the west side of the property to Saint Vrain Creek. The distance of the exposed ground water to the stream=80 feet, and the location of the parallel impermeable boundary was estimated to be 4,000 feet from the stream. For purposes of this SWSP, the distance of the exposed ground water to the river X is accepted; however, should the Applicant seek to renew this SWSP, the Applicant must calculate the depletions with the X value measured from the centroid of the pond. Replacement The proposed source of replacement for this pit is the junior water rights that were decreed in case no. 2001 CW274. The water rights decreed in case no. 2001 CW274 can be used directly at the points of diversion or retained in reservoirs for storage when the water rights are in priority or used by exchange for releases from any or all of the reservoirs or any or all of the direct flow sources. The decreed information for these junior water rights is shown in the following table: WDID Source Appropriation Dane Decreed Amount 0600532 VCI Godding DitchreDeiversion from Idaho 0811012001 11 cfs 0600551 VCI Rural Ditch Diversion from Boulder Creek 08/10/2001 11 cis 0600756 VCI Rural DitchDivver ion from Idaho eek 08110/2001 11 cfs 0500642 VCI Goddin Hollow Diversion 0910872000 11 cis 0500589 VCI Last Chance Ditch Diversion 0811012001 11 cis 0504001 112 Reservoir 0811012001 1,552 acre4eet 0504003 Dakolios Reservoir 0811012001 1 104 acre-feet 0504002 Von Ohten Reservoir 0811012001 1:300 acre-feet 0304000 Kurtz Reservoir 0811012001 4,000 acre-feet Note: Total direct diversion from all sources not to exceed 11 cfs. Storage rates are 90 cfs for Rural Ditch and Godding Ditch, 10 cfs for Godding Hollow and 100 cfs for Last Chance Ditch. Water was diverted through the Rural Ditch for storage in 112 Reservoir and the Dakolios Reservoir over the extended free river period that started in September 2009 and continued through the beginning of June 2010. According to the decree in case no. 2001 CW274, water stored in the reservoirs or used directly at the point of diversion may be used for replacement of depletions at the mining sites owned or leased by VCI. The Kurtz Pit site has been identified as'one of the mining sites where the junior water rights decreed in case no. 2001 CW274 may be used as a source of replacement water. You indicated that as of May 2010 the water stored in the 112 Reservoir and naknlios Reservoir totaled 1,627 acre-feet consisting of a combination of Rural Ditch water and junior