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<br /> <br />Gregg Squire - 2 - July 25, 1990 <br />4. The plan describes side slopes to be constructed at a minimum of 5 to 1 <br />on the east side of the reservoir and 3 to 1 elsewhere. It would appear <br />the criteria should be stated in terms of maximum slope rather than <br />minimum slope. Please clarify. <br />5. An alternate reclamation plan is included in the event water rights for <br />storage are not obtained within two years of completion of reservoir <br />construction. The plan describes breaking the reservoir seal to allow <br />ground water to fill the pit. Senate Bill 120 enacted in 1989 requires a <br />well permit be obtained for all open-pit gravel mining which exposes <br />ground water to the atmosphere. Aplan-for-augmentation will be required <br />as the South Platte basin is overappropriated. The discussion of the <br />alternate reclamation plan as proposed does not include this commitment. <br />Please describe your commitment in this regard. <br />6. The reclamation performance standards state that: "The operation will be <br />carried out in a wet or semi-wet condition." This statement appears to <br />contradict the earlier description provided in the mine plan that a <br />dewatering operation is proposed. Please clarify. <br />7. The comments provided by the Urban Drainage and Control District dated <br />June 15, 1990 on the drainage system design should be addressed. <br />8. A reconstructed channel is proposed to carry First Creek down the gas <br />pipeline corridor. In addition, a lateral spillway to be constructed of <br />buried riprap is proposed to be located in the corridor as well. The gas <br />pipeline is a permanent man-made structure. Have you obtained an <br />agreement with Western Slope Gas for this planned activity? <br />Exhibit G - Water Resources <br />9. What unit rates were used to develop the total water consumption <br />estimate? Please describe the corresponding surface areas or volumes to <br />which each rate value was applied in deriving the estimate. Individual <br />amounts of annual water volume required for wash water, moisture loss in <br />materials, and dust control should be submitted. <br />10. Please provide an estimate of water consumed due to evaporative loss from <br />the lake surface should the alternate reclamation plan be implemented. <br />11. The ground water analysis report states that three lakes will be created <br />by the mining operation. On page 2 of this report it is stated that the <br />existing lake on the Howe property will remain. These statements are <br />inconsistent with the plan described in other parts of the application. <br />Please clarify. <br />In addition, the ground water analysis is based on the assumption the <br />existing lake is used for recharge. On page 3, the discussion says the <br />shape of the cone of depression is influenced by the expected recharge of <br />the existing lake. It appears additional well owners may be affected if <br />the lake is not issued for recharge purposes. Please address and provide <br />a revised groundwater analysis which is consistent with the plan as <br />proposed. <br />