2004-11-09_REVISION - M2000016 (6)

Home Browse Search

By Mr. Richard T. Raines April 2, 2001 Page 2 The proposed source of replacement water for this substitute water supply plan is a non- tributary Arapahoe aquifer well (Permit No. 28265-F) 'ocated near Sedalia, Colcrado along Plum Creek. The well is permitted in the name of Mobile Premix ::oncrete, Ire. and allows an annual appropriation of 92 acre-feet from this source. The permit for this well requires that 4 percent of the water pumped must be directly returned to the Plum Creek drainag~=. As a result, 88.3 acre- feet is available from this well for augmentation purposes. This well source also provides replacement water: for substitute water supply plans associated with two other Lafarge aggregate mining operations. These include the Dunes Development site (M-99-093) and the Tanabe Pit (M-00-002). Replacement obligations for these sites total 44.5 acre-feet (27.3 acre-feet and 17.2 acre-feet, respectively). This leaves approximately 43.8 acre-feet available to meet the 39.3 acre-feet replacement requirement at the Fort Lupton Pit. The well is located approximately 50 miles upstream of the aggregate operation. A 0.25 percent transit loss (12.5 percent overall loss) has be<~n accounred for in the replacement schedule. As required by Section ~ of Senate Bill 89-120, this substitute water supply plan has been prcvided to an outside consultant for review. The consultant has recornmended approval of the plan byway of a draft of this letter. Based upon statutory requirements and the recommendations of the consultant, I hereby approve the proposed substitute water supply plan in accordance with Section §37-80-12C, C.R.S., subject to the following conditions: A well permit must be issued for the gravel pit in accordance with Section §37-90-137(2) and (11), C.R.S prier to the further exposure or use cf groundwater. The pending permit application (receipt number 466024) will be evaluate:] pursuarn: to this plan. As noted in your letter of August 29, 2000, the consent of one well owner (Permit No. 213063), whose well is located within 600 feet of the site, is a requirement far issuance of the well permit. A notice was sent to the we.l permit holder by this office on October 4, 2000. No objection to the application or request for hearing wars received back by the November 3, 2000 deadline. 2. The fosses associated with this mining operation must not exceed a total of 34.9 acre- feet for the duration of this permit approval. These losses include 26.6 acre-feet of evaporation from the existing and proposed exposure of groundwater, 1.0 acre-feet of water used for dust suppression and 7.4 acre-test of water lost In 250,000 tons of aggregate mined. Wlth 4.4 acre-feet of trans t losses associated with the transport of the non-tributary groundwater from the wellheaC to near the pit site, the total replacement wafer required under this plan, from the non-tributary Arapahoe aquifer well (Permit no. 28265-F), is 39.3 acre feet per year. Should the annual depletions to the South Platte River exceed 39.3 acre-feet prior to the expiration date cf this plan, an amendment will need to be filed with this office.