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• 4.09 DISPOSAL OF EXCESS SPOIL AND UNDERGROi JND DEVELOPMENT FILL <br />WASTE <br />Colowyo originally constructed the excess spoil fill known as Streeter Fill in accordance with <br />Section 2.06.2, Experimental Practices Mining. The details of this alternative spoil disposal <br />practices are set forth in Section 2.06.2. <br />On March 3, 1986 Colowyo submitted a request to the Division for a Technical Revision to <br />change the status of the Streeter Fill Experimental Practice. The request was to change the <br />Streeter Fill to an excess spoil fill designed and constructed under the alternative design <br />standards set forth in Rule 4.09. (3). Al] the monitoring requirements of the fill will remain <br />as originally approved to insure the stability requirements of Rule 4.09 are met. <br />The Division approved the revision on August 18, 1986. <br />For further details regarding this Technical Revision and the history of Streeter Fill, refer to <br />Section 2.06, Special Categories. <br />In December, 1993, Colowyo proposed a Technical Revision to the Division to reduce the <br />monitoring requirements for Streeter Fill. During the 1993 - 2006 period, the following <br />monitoring plan was implemented: <br />Streeter Fill Monitoring, and Inspection Plan for Streeter Fill (1993-2006) <br />• 1) Colowyo conducted monitoring of the 12 Streeter Fil] survey monuments once a <br />year, during the second calendar quarter of each year. For a location of the <br />twelve survey monuments (6700 N and S through 7200 N and S) and the baseline <br />reference monuments (AH-21, RP-2 and SRP-3) refer to Drawing 30A -Revised <br />Streeter Fill As-built. The revised Drawing 30A is intended to update the Permit <br />only with respect to 1) the Streeter fill survey monuments, 2) baseline reference <br />monuments and 3) the wells (W6900N, W6900S and W6700). The original <br />Drawing 30 -Streeter Fill Design and As Built will remain in the Permit and <br />serve to represent all other aspects of Streeter Fill. <br />2) Colowyo monitored water level in the Streeter Fill piezometer well (W6700) and <br />conduct a spring and seep survey quarterly. <br />3) In the event that the water table in the piezometer well rises to a level greater than <br />10 feet above bedrock, Colowyo agreed to notify the Division <br />I~ <br />L <br />4.09-1 Revision Date: 03/24/06 <br />Revision No.: TR-64 <br />