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<br />ps ~% STATE OF CbLORADO
<br />OFFICE OF THE STATE ENGINEER
<br />Division of Water Resources
<br />Department of Natural Resources ~oe~co~~
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<br />1313 Sherman SUeet, Room 818 ~+.
<br />Denver, Coloratlo B0203 ''aye'
<br />Phone (303) 8663581 January 22, 2007
<br />FAX (303) 866-3589
<br />
<br />htip://www.waterstate.co.us ~ Bill Ritter, Jr.
<br />Governor
<br />RECEIVED Exewfi eD~eclor
<br />/iAA, ~ r~ ^oo~
<br />11/1IY L ( Hal D. Simpson, P.E.
<br />State En
<br />ineer
<br /> g
<br />Ms. Cristyn R. Radabaugh, P.E. / Division of Reclamation
<br />,
<br />Martin and Wood Water Consultants, Inc. Mining and Safety
<br />602 Park Point Drive, Suite 275
<br />Golden, Co 80401
<br />Re: Substitute Water Supply Pfan, Loveland Ready Mix
<br />Green/Croissant Pit (DMRS #M-01-022) ~/
<br />Section 30, TSN, R67W, 6th P.M.
<br />Water Division 1, Water District 4, Weld County
<br />Approval Period: January 1, 2007 through December 31, 2007 or December 31, 2008
<br />Contact Phone Number for Ms. Cristyn R. Radabaugh: 303-526-2600
<br />Dear Ms. Radabaugh:
<br />Your letter dated November 16, 2006, requesting renewal of the above referenced substitute
<br />water supply plan to cover depletions caused by an existing gravel mining operation has been
<br />reviewed. The required fee of $257 for the renewal of this substitute water supply plan has been
<br />submitted. The original plan was approved on August 7, 2003 and it was most recently approved in
<br />a letter dated July 13, 2005.
<br />During. 2007 and 2008, there will be evaporative losses from mined cells, a dewatering
<br />trench, settling ponds, and wash ponds. Operational losses will include water retained in aggregate
<br />removed from the site, water used in concrete batching, and water used for dust suppression. The
<br />anticipated annual net depletion for this plan is 73.02 acre-feet for 2007 and 85.06 acre-feet for
<br />2008. Furthermore, according to the monthly breakdowns provided, the 2007 depletions are
<br />estimated as 48.59 acre-feet of evaporation from 19.28 acres of water surface exposed after
<br />December 31, 1980, 7.36 acre-feet of water lost with the mined product (250,000 tons), 3.25 acre-
<br />feet used for dust suppression, and 13.82 acre-feet used in concrete batching (150,000 cubic
<br />yards). The 2008 depletions are estimated as 60.63 acre-feet of evaporation from 24.08 acres of
<br />water surface exposed after December 31, 1980, 7.36 acre-feet of water lostwith the mined product
<br />(250,000 tons), 3.25 acre-feet used for dust suppression, and 13.82 acre-feet used in concrete
<br />batching {150,000 cubic yards). The evaporation calculations were based on the entire exposed
<br />surface area in the event that the dewatering ceased. As in the previous approval no credit is being
<br />claimed for the stock ponds on the property that were in existence within the reclamation permit
<br />boundary prior to January 1, 1981.
<br />The IDS AWAS stream depletion model was used to determine the lagged depletions to the
<br />Big Thompson River. The following parameters were used in the model: transmissivity (T) = 50,000
<br />gallons per day per foot, specific yield (SY) = 0.2, the distance from the Big Thompson River to the
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