2009-04-01_HYDROLOGY - M1978052 - Laserfiche WebLink

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• Richard T. Raines March 27, 2009 Page 5 attached Table 1. Should the lagged depletion from any of the pits exceed the values listed in Table 1, an amendment will need to be filed with this office. 3. All pumping for dust control shall be measured in a manner acceptable to the division engineer. 4. The applicant shall maintain daily records of all diversions, replacements, and the amount of water used for each particular purpose. The applicant shall provide a report of these records to the division engineer and the water commissioners on a monthly basis on a form approved by them. The accounting must be submitted within thirty (30) calendar days of the end of the month for which the accounting is being made. Failure of the Applicant to provide timely accounting to the water commissioners may result in revocation of this SWSP. In addition, the applicant shall submit a report from each entity making replacements; for this plan, that entity is the City of Aurora. The report shall include an accounting of all wastewater plant water effluent controlled by each entity, showing the total volume of water under its control at the various wastewater treatment plants, and the amount committed to each of the recipients of the water. 5. All releases of replacement water must be sufficient to cover all out of priority depletions and be made under the direction and/or approval of the Water Commissioner(s). The replacement may be aggregated to maximize beneficial use. The Water Commissioner(s) and/or Division Engineer shall determine the rate and timing of an aggregated release. 6. The replacement water, which is the subject of this plan cannot be sold or leased to any other entity. As a condition of subsequent renewals of this substitute water supply plan, the replacement water must be appurtenant to this site until a plan for augmentation is obtained. A copy of this approval letter should be recorded with the county clerk and recorder. All replacement water must be concurrent with depletions in quantity, timing, and locations. The use of replacement water must be in compliance with all agreements with the providers of replacement water. 7. Due to a change in administration of evaporation from ground water exposed to the atmosphere prior to 1981, pre-1981 credits will no longer be allowed for gravel pits which exposed ground water to the atmosphere prior to 1981 and were actively mined on or after January 1, 1981. Accordingly, evaporative depletions for such gravel pits will need to be replaced from the entire surface area of the ground water exposed in the pits. In order to allow owners and operators of the affected pits time to comply with this change in the administration requirements, the owners and operators will have until January 1, 2010 to comply with the replacement requirements. If the area included in the DRMS mining permit site contains individual gravel pit ponds that were not altered or mined after December 31, 1980, you may still be able to maintain the "pre-81" credit provided you can document when mining in the individual ponds ceased. The Applicant is hereby notified that in accordance with the above described change in administration, the evaporation from ground water exposed prior to 1981 must be replaced after January 1, 2010 in any subsequent SWSP renewal for Howe Pit. 8. Dewatering at the pits will produce delayed depletions to the stream system. As long as the pit is continuously dewatered, the water returned to the stream system should be adequate to offset the depletions. However, once dewatering at the site ceases, the delayed depletions must be addressed. At least three years prior to completion of mining, a plan must be submitted that specifies how the post pumping dewatering depletions (including refilling the pit) will be replaced