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Daniel J. Gillham, P.E. <br />August 26, 2015 <br />Page 2 of 5 <br />PLAN OF OPERATION <br />Mining at this site was completed by Valco, who then transferred ownership of the property to <br />Lamar on April 30, 2013. Lamar is now responsible for replacement water requirements for <br />the North Gateway Park Ponds, which are currently registered under valid permit no. 52184- <br />F. There is a total water surface of 30.2 acres at the site, as verified by a survey completed <br />on June 29, 2012. A comparison was made of the first substitute supply plan request (which <br />indicated that on December 1, 1980, 13.2 acres of pond area existed), versus the present <br />pond area of 30.2 acres, it was determined that 7.0 acres qualified as pre -1981 exposure and <br />23.2 of which were exposed post 1981. The pre -1981 exposed water surface must be in the <br />same location as the post -1981 exposed water surface in order to claim the exemption. The <br />calculated evaporation requiring augmentation is 95.35 acre-feet (see Table 1, attached). <br />Well Permit WDID Total Pre -1981 Exposure Post -1981 Exposure <br />No. Exposure (acres) (acres) <br />52184-F 6706363 30.2 7.0 23.2 <br />In accordance with the letter dated April 30, 2010 from the Colorado Division of Reclamation, <br />Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the <br />requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the <br />protection of water resources. The April 30, 2010 letter from DRMS requires that you provide <br />information to DRMS to demonstrate you can replace long term injurious stream depletions <br />that result from mining related exposure of ground water. In accordance with approach no. <br />2, the North Gateway Park Ponds are proposed to be covered under a plan for augmentation <br />in case no. 13CW3060, which is currently pending before the Division 2 Water Court. <br />DEPLETIONS <br />The three ponds are located at an average distance of 76.7 feet from the Arkansas River. You <br />have performed a Glover analysis using the following parameters: <br />Transmissivity 200,000 gpd/ft <br />Specific yield 0.2 <br />Distance 76.7 feet from the river <br />You have enclosed the results of your analysis, which indicate that 95.8% of the depletions to <br />the river occur within the first month. Therefore you have made the assumption that alt <br />depletions may be considered to occur within the same month for accounting purposes. The <br />total depletion to the Arkansas during the plan period of this SWSP is 95.35 acre-feet. <br />Please note that it appears the average distance used in your analysis was the average <br />distance from the edge of the ponds to the Arkansas River; therefore, please include a <br />lagging analysis that incorporates the average distances from the Arkansas River to the <br />centroids of the ponds in any renewal request made for this SWSP. <br />1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 F 303.866.3589 www. water. state. co. us I y� o <br />1876 <br />