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DEPARTMENT OF NATURAL RESOURCES <br />DIVISION OF WATER RESOURCES <br />Ms. Michelle Johnson, P.E. <br />v Martin and Wood Water Consultants, Inc <br />538 Commons Drive <br />Golden, CO 80401 <br />October 3, 2012 <br />Approval Period: June 1, 2012 through May 31, 2014 <br />Contact Phone Number for Ms. Johnson: 303 - 526 -2600 <br />RECL <br />'CT O Z.U1 <br />cYsti'.fCif� � <br />John W. Hickenlooper <br />Governor <br />RE: 25 Ave Substitute Water Supply Plan, WDID0303330 (AMENDMENT # 1) <br />25 Ave Pit, DRMS No.1Q1- 2002 -020, WDTD 0303040 <br />Section 36, T6N, R66W, 6th P.M. <br />Water Division 1, Water District 3, Weld County <br />Mike King <br />Executive Director <br />Dick Wolfe, P.E. <br />Director /State Engineer <br />Dear Ms. Johnson: <br />Your letter dated July 31, 2012, submitted on behalf of the City of Greeley ( "Applicant" or <br />"Greeley "), requesting an amendment to the above mentioned Substitute Water Supply Plan <br />( "SWSP "), has been reviewed. The amendment seeks to add in depletions and accretions <br />associated with additional dewatering at the site, and is submitted in accordance with § 34 -90- <br />137(11), C.R.S. The required fee of $257 has been received (receipt # 3656424). All terms and <br />conditions of the original SWSP, except where specifically changed below, remains in full force <br />and effect. <br />Amended Site Operations <br />At the time of the original SWSP application for this site, Greeley did not anticipate <br />dewatering any of the pits except for Flatiron Pits 3 & 4. Due to gravel pit operations, Greeley <br />will now need to temporarily dewatering Flatiron Gravel Pit 5 ( "Pit 5 ") to allow the building of a <br />berm. There will be no mining occurring within Pit 5, and there are no other changes to the <br />original SWSP except for the additional depletions associated with the dewatering of Pit 5. <br />Depletions <br />Pit 5 is currently full and will be dewatered staring early August at an initial pumping rate <br />of 3,400 gallons per minute ( "gpm "). This water will be discharged directly to the river with no <br />beneficial use. After the initial high dewatering rate, the applicant projects to have a lower <br />pumping rate to maintain a dewatered state of 850 gpm. Dewatering of the lake will not result in <br />depletions to the stream system so long as the pit remains dewatered thus preventing the refill <br />of the pit. Dewatering of the alluvial aquifer will result in depletions to the stream system. The <br />initial dewatering will be made up of both lake water and alluvial aquifer water. The <br />maintenance dewatering will be made up of only alluvial aquifer water. For the purposes of this <br />SWSP it is assumed that the initial dewatering will deplete the alluvial aquifer at the <br />maintenance pumping rate. Therefore, depletion modeling will show 850 gpm of the initial rate <br />of 3,400 gpm as causing a depletion and the remainder (2,550 gpm) will not be included in the n <br />Office of the State Engineer ` -; 0 <br />1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303 -866 -3581 • Fax: 303 - 866 -3589 <br />www.water.state.co.us <br />