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• The temporary East Taylor Fill -39 million cubic yards <br /> • The permanent West Taylor Fill -28 million cubic yards <br /> • The temporary West Taylor Fill - 12 million cubic yards. <br /> The Little Collom Gulch Fill contains the initial box-cut material from the Collom Pit. The fill is also <br /> associated with part of the Collom Spoil Pile construction. The approximate design volumetrics <br /> associated with these fills are as follows: <br /> • The permanent Collom Spoil Pile- 17.3 million cubic yards <br /> • The permanent Little Collom Gulch Fill - 4.1 million cubic yards <br /> • The temporary Collom Spoil Pile - 6.6 million cubic yards <br /> Specific information on the Streeter Fill can be found in Exhibit 12 of the PAP and in Section B, Item <br /> V of the original findings document. Specific information on the West Pit and Section 16 fills is <br /> presented in Exhibit 19 of the PAP and in the files for revision PROI. The fills meet the regulatory <br /> definition of valley fills and therefore must meet the regulatory requirements of Rules <br /> 4.09.1 and 4.09.2. <br /> The Division approved the fills as disposal areas for excess spoil (Rule 4.09.1(1)). Approved fill <br /> designs are found in Exhibit 19 of the PAP. The construction method approved was end dumping <br /> excess spoil material in 50 to 100foot horizontal lifts. Prior to construction of the fills, all topsoil was <br /> removed from the areas as well as clay subsoils beneath the toe of the West Pit fill. Rock <br /> underdrains are constructed in natural drainage bottoms from the toes to the heads of the fills. The <br /> fills are completed with 3h:Iv outslopes and with 12footwide terraces constructed at approximately <br /> 100foot intervals. Topsoil replacement and seeding completes the reclamation. A series of survey <br /> monuments and groundwater piezometer wells are monitored quarterly, with results reported to the <br /> Division. <br /> Based upon the geotechnical analyses prepared by CTL/Thompson Inc. (September 5, 1991 and April <br /> 27, 1992) and submitted by Colowyo to the Division, and based upon monitoring data from the <br /> Streeter Fill at the Mine, the Division found that the proposed West Pit and Section 16 excess spoil <br /> fills were designed in compliance with the requirement of Rule 4.09.2. Specifically, the fills were <br /> designed to attain static safety factors in excess of 1.5; material densities will be adequate to prevent <br /> mass movement; end dumped lift placement and gravity segregation of spoil materials will preclude <br /> the formation of deleterious voids within the fills; and no contamination of the rock underdrains <br /> would occur(Rule 4.09.1(2)). <br /> The Division has approved the following practices related to fills: <br /> • Vegetation and organic material can be used as mulch or as an amendment to topsoil to <br /> control erosion, promote growth, or increase moisture retention (Rule 4.09.1(4)). <br /> • Terraces can be used in order to control erosion and enhance stability (Rule 4.09.1(9)). <br /> VIIL Coal Mine Waste Banks-Rule 4.10 <br /> 43 <br /> Permit Revision No.5(PR-05),G 1981-019 <br />