2000-10-10_GENERAL DOCUMENTS - M2000002

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feet of the proposed pit be contacted. Water Commissioner Robert Stahl (9378 WCR 2~, Ft. Lupton, CO 80621, 303-857-0742) visited the site on January 19, 2000, and determined that there were two permitted wells within 600 feet of the proposed pit. The owners of the two wells were notified of the gravel pit well permit application by certified mail and no responses were received. Looking at a larger range, the figure in Attachment C shows the permitted wells and adjudicated water rights within '/a mile of the Tanabe site. The exhibit was created from permitted well and water right tabulations obtained from the State Engineer's Office. Although other wells may exist in the area, they are not registered and permitted with the State Engineer's Office. The extent of pit dewatenng affects is depicted at 1,000 feet from the pit boundary. Although the estimated extent of pit dewatering is 750 feet, the 1,000-foot boundary includes an extra margin of error for drawdown calculations. Many of the wells within the 1,000-foot boundary are either owned or controlled by the applicant. Almost all of the remaining well owners within the boundary were either contacted during the mine pit well permitting process with no response, or have signed potential impact agreements with the applicant. Copies of these agreements are included in Attachment D. Further than 750 feet from the proposed pit, the applicant does not anticipate dewatering operations at the site to impact the alluvial ground water use of well owners: Regardless, if water levels drop in near by wells, due to dewater_ing at the Tanabe operation, such that the well owners historic .water :production is ,injured, the, applicant will implemen4 ,one. br more of.the - folltiwing measures, ;: However, if the well was not put •to benefcial;use.;prior,to.`mining, the. :applicant should have no responsibility fo provide mitigation, ; ~ ;~: . ' %.~: , ': •~:'•:_.:~ -;; . `.• .. ~'~-- ';~'~ '_,'" 1.' ,.':`.Modify ezistirig wells to"operate under lower, ground'wafer,•,,conditi'ons`,Tfiis~.would- ' : ~.include~r"e~iillirig ezisting:wells"to deeper depths or.lowermg the.~pumps~; All.work;, - =% ' • `would be~done at the applicants expense with `the•'exception of'replacing.equipment that was non-functional prior.to mining. 2. ' If existing wells cannot be repaired; the applicant will drill~a new welh'for the owner to replace the damaged well. The new well will prodtice water of ttte same quantity and quality to support the historic use. ' . 3. Water from the dewatering operation at the proposed Tanabe Pit will be directed to the property of the well claiming injury to replace in kind the amount of water legally permitted to withdraw from the well. If you have any questions or need additional information, please do not hesitate to call me at (303) 452-661 1. Sincerely, TUTf~ A PGP ~~2~~~'Fyf~N C. ~i dliam Chen erlem Project Engineer Enclosures cc: TA File #99-254 John Hickman, Lafarge rage 2