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RIDER TO MINING PERMIT <br />Permit Date: April 30, 2009 <br />Permit No.: M-2007-087 <br />The following additional stipulations and conditions form an integral part of the foregoing permit: <br />Stipulation No. Description <br />No mining will occur within 200 feet of monitoring wells owned by the City of <br />Thornton until the Operator provides written evidence that an agreement has been <br />reached between the two parties that permission has been granted for removal of <br />the wells, or the engineering evaluation is submitted and approved. Unless <br />removed in their entirety, the wells must be abandonment in accordance with the <br />Rules and Regulations of the Office of the State Engineer. <br />Operator will monitor ground water levels upgradient and downgradient of the <br />backfilled area for a period of two years following completion of reclamation to <br />ensure that ground water is not mounding to levels that could adversely impact <br />surrounding structures. If the City of Thornton does not allow use of their wells <br />for the needed monitoring, the Operator must install piezometers to conduct the <br />monitoring prior to initiating mining activities. <br />MINED LAND RECLAMATION BOARD <br />COLORAD EPARTMENT OF NATURAL RESOURCES <br />RONALD W. CATTANY <br />Division Director