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Page 4 <br /> Rule 6. Determination of Specific Yield For Wells In The Denver Basin: <br /> A. In determining the allowed average annual amount of withdrawal <br /> from a well in one of the Denver Basin Aquifers, the State Engineer <br /> shall apply the following specific yield values, unless the applicant <br /> or permittee submits site specific data acceptable to the State <br /> Engineer that support a different value pursuant to paragraph B below: <br /> Aquifer Specific Yield <br /> 1 . Upper Dawson - 20.0% <br /> 2. Lower Dawson - 20.0% <br /> 3. Denver - 17.0% <br /> 4. Upper Arapahoe - 17.0% <br /> 5. Lower Arapahoe - 17.0% <br /> 6. Laramie-Fox Hills - 15.0% <br /> B. If a specific yield test or tests meeting the requirements of the <br /> Statewide Nontributary Ground Water Rules are done at the location of <br /> a permitted well or wells, the value derived therefrom shall be used <br /> as the specific yield for determining the allowed average annual <br /> amount of withdrawal from the well or wells. If the requirements of <br /> a specific yield test are not set forth in the Statewide Nontributary <br /> Ground Water Rules or those rules are not in effect, the State <br /> Engineer shall consider site specific data for specific yield • <br /> presented by an applicant or oermittee and vary the specific yield <br /> value for determining the allowed average annual amount of withdrawal <br /> from a well if such data rebut the presumptive value set forth in <br /> Rule 6.A. Such use of site specific data shall not be deemed to be a <br /> modification of these rules. In determining whether an applicant or <br /> permittee has rebutted a presumptive specific yield value set forth <br /> in paragraph A above, nothing in this rule shall preclude the State <br /> Engineer from considering any other site specific data available to <br /> him. <br /> Rule 7. Determination of Number of Feet of Saturated Aquifer Materials in <br /> the Denver Basin Aquifers: The thicknesses of sandstones and siltstones in <br /> the Denver Basin Aquifers are shown on the following figures: <br /> A. Upper Dawson Denver Basin Atlas No. 1 , Plate 3, <br /> Figure 1E <br /> B. Lower Dawson Denver Basin Atlas No. 1, Plate 2, <br /> Figure 1C <br /> C. Denver Denver Basin Atlas No. 2, Plate 2, <br /> Figure 2C <br /> - ray <br /> ru <br /> II 2 CCR 402-6 THE CODE OF COLORADO REGULATIONS <br />