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en: By: AFFLEGATE GROUP, IMr.; <br />Mr. Richard T. Raines <br />April 2, 2001 <br />Page 2 <br />3034526611; Flcv-4-04 9:3tAh1; Page 4 <br />The proposed source of replacement water for this substitute water supply plan is a non- <br />tributary Arapahoe aquifer well (Permit No. 28265-F) 'orated' near Sedalia, Colorado along Plum <br />Creek. The well is permitted in the name of Mobile Premix concrete, Inc. and allows an annual <br />appropriation of 92 acre-feet from this source. The permit for this well requires that 4 percent of <br />the water pumped must be directly returned to the Plum Creek drainag~_. As a result, 88.3 acre- <br />feet is available from this well for augmentation purposes. <br />This well source also provides replacement water:: for substitute water supply plans <br />associated with two other Lafarge aggregate mining operaiions. These include the Dunes <br />Development site (M-99-093) and the Tanabe Pit (M-00-002}. Replacement obligations for these <br />sites total 44.5 acre-feet (27.3 acre-feet and 17.2 acre-feet, respectively). This leaves <br />approximately 43.8 acre-feet available to meet the 39.3 acre-feet replacement requirement at the <br />Fort Lupton Pit. The well is located approximatety 50 miles upstream of the aggregate operation. <br />A 0.25 percent transit loss (12.5 percent overall loss} has be<an accounted for in the replacement <br />schedule. <br />As required by Section 8 of Senate Bill 89-120, this substitute water supply plan has been <br />provided to an outside consultant for review. The consultant--has recommended approval of the <br />plan byway of a draft of this letter. Based upon statutory requirements and the recommendations <br />of the consultant, I hereby approve the proposed substitute water supply plan in accordance with <br />Section §37-80-12C, C.R.S., subject to the following conditions: <br />A well permit must be issued for the gravel pit in acuvrdance with Section §37-90-137(2) <br />and (11), C.R.S prier to the further exposure or use Gf groundwater. The pending permit <br />application (receipt number 4660241 wilt be evaluated pursuant to this plan. As noted in <br />your letter of August 29, 2000, the consent of one well owner (Permit No. 213063), <br />whose well is located within 600 feet of the site, is a equirement for issuance of the well <br />permit. A notice was sent to the we.l permit holder by this ot'fice on October 4, 2000. <br />No objection to the application or request for h<;aring wars received back by the <br />November 3, 2000 deadline. <br />2. The tosses associated with this mining operation must not exceed a total of 34.9 acre- <br />feet for the duration of this permit approval. These losses include 26.6 acre-feet of <br />evaporation from the existing and proposed exposure of groundwater, 1.0 acre-feet of <br />water used for dust suppression and 7.4 aae-feet of water lost In 250,000 tons of <br />aggregate mined. Wtth 4.4 acre-feet of transit lasses associated with the transport of <br />the non-tributary groundwater from the wellheat to near the pit site, the total <br />replacement water required under this plan, from the non-tributaary Arapahoe aquifer well <br />(Permit no. 28265-F), is 39.3 acre feet per year. should the annual depletions to the <br />South Platte River exceed 39.3 acre-feet prior to the expiration date cf this plan, an <br />amendment will need to be filed with this office. <br />