2013-04-29_HYDROLOGY - M1979189 - Laserfiche WebLink

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s pp J1, r L* r'J i ^ � ' Y� $ . x KqtrH,lni!ji APPROVAL OF PLAN FOR AUGMENTATION 1 2. Name of structure to be augmented' Superior Sand Pit 13. Water rights to be used for augmentation: Return flows from use of or direct discharge of nontributary groundwater decreed herein. 14 Statement of plan for augmentation pursuant to 37-90-137(11 )(a)(;), C.R.S.. Applicant is the owner and operator of a commercial sand operation located on lire Subject Property. At full capacity the sand operation will cover an area of approximately 43 acres and expuse groundwater to the atmosphere which will cause depletions to Sand Creek. The sand pit will be developed incrementally an f augmentation requirements will vary dope.rarn f ::urf :cw area of the pit duri ^r; rb elnpment Pursuant to 37- 92- 305(12)(a), C.R.S., portions of depletions caused to the stream system from evaporation and the operation of the sand pit will be replz' ed by claiming credit for the natural depletion to the stream caused by pre - existing natural vegetative cover which is permanently replaced by the sand pit operation. For operation and accounting of this plan for augmentation, Applicant has calculated a weighted average for the density types of vegetation on the Suh;ect Property which will be removed by construction of the pit. Applicant has calculated that gross evaporation is equal to 3.67 acre -feet per surface acre of water to be exposed by the construction of the pit. Applicant will be required to replace a net evaporation, based on an average credit for remove: of vegetation, of 1.39 acre -feet per surface acre, resulting in a replacement requirement of 2.28 per surface acre. As the size cf the pit expands and the exposed surface area increases, Applicant will replace depletions to the stream system in a timely manner and in an amount based on the net evaporation per acre described above. Replacement requirements will be calculated at the end of each month, based the amount of surface acres exposed, amount of product rrined, and water used for duet suppression, pursuant to the accounting form as shown on Exhibit S attached hereto, Said replacement requirement will be returned each month by return flaws from the use of or direct diechargc le the pit of the nontributary groundwater rights decreed herein. For purposes of this decree, water used for washing of rock product is estimated to return 96% of that water to the stream system, and water used for dust suppression will be 100% consumed. Applicant realizes that there is only sufficient nontributary groundwater underlying the Subject Property as quantified in paragraph 5 above, to provide replacements tor depletions associated with a maximum of 16.5 of the proposed approximately 43 surface acres. Therefore, if the amounts of nontributary groundwater decreed herein are in an insufficient quantity to replace depletons for the total 43 surface acres proposed under this tOI I ICEIWP'.' SMAWGAAND AUK Au:F 5 jf. •^ {r th P y 4 �r - h '.rtiltt�+ S��r;y.y��l t /,:.,.'1 t ur:' "�(. Ca , s a y* i', t�N :+i?'�ct��;�in..,+1j�rtC ".��.