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J~`~ ~ III IIIIIIIIIIIIIIII ~-~ <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dep.irtn~.erd or Nawral Resources <br />171 7 Sherman Se., Room '_15 <br />Denvar, Colorado 80103 <br />Phone: 0071 866-3567 <br />Fn\: (JOl) 87?-8106 <br />June 27. 2000 <br />FOR YOUR CORRESPONDENCE FILE <br />Mr. Dick Wolfe <br />Office of the State Engineer <br />1313 Sherman Street, Room 8l8 <br />Denver, CO 80203 <br />RE :Henderson -Groundwater Investigation <br />~~ <br />DIVISION O <br />MINERAL' <br />GEOLOG' <br />R E C L A M A T I O r <br />HINING~SAFET <br />B~u o.ven, <br />Governor <br />Greg E. ~Valcner <br />E.ecunve Direuor <br />Michael B. Lorry <br />Dimsion Director <br />The Division of Minerals & Geology requests your assistance in evaluating possible impacts to a number of <br />groundwater users in the Henderson area from nearby, active sand & gravel pits. As you may know, Henderson is <br />located in Adams County and near the South Platte River. Recently, the Division of Minetals & Geology ha_s <br />recieved three (3) sepazate complaints from various well owners in the Henderson area. The complaints aze <br />quantitative in nature and concern significant drops in the ground water surface. It appears that at least two (2) of the <br />wells'in question are registered with the Office of the State Engineer (OSE) and may be within 600 feet of at least <br />one or more active mining operation. This information was confirmed by a DMG staff member on June 23, 2000 <br />during a site visit with Robert Stahl, Water Commissioner, District 2. <br />The Henderson area contains a number of active alluvial pits, most of which are dewa[ering and using dry mining <br />methods. A few of the pits have already been filled with water but have not yet been released from reclamation <br />responsibility. The Division of Minerals & Geology's (DMG's) interest in this matter is to de[erntine the following: <br />l) Are the operations listed on the following page incompliance with all appropriate OSE requirements, ie: well <br />permit, TSSP, augmentation plan, etc., 2) Are there any qualified wells, ie: properly completed to the first aquitard, <br />functional, & registered, within 600 feet of any of the operations listed on the following page, 3) Are [here any wells <br />(complaintant or other) that qualify for protection of water rights under State statutes, 4) Has a properly qualified <br />well experienced an adverse impact, and if so, is the impact directly attributed to the practices of a particular mining <br />operation or combination mining operations, as opposed [o having been adversely affected by drought conditions or <br />some other factor, and 5) If a properly qualified well has been adversely and directly affected by a mining operation <br />or mining operations, is the impact attributed to one particular operation or to a cumulative impact of several or more <br />operations that may be more than 600 fee[ away from the well. <br />The Division requests your assistance in this matter and would like to meet with you at your eazliest convenience [o <br />determine a sVategy for properly evaluating this concern and responding to the complaintants. <br />Sincerely, <br />r <br />H. Bruce Humphries <br />Minerals Program Supervisor <br />cc: Tom Schreiner & Carl Mount, DMG <br />Robert Stahl, DWR <br />