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,. <br />.,~ <br />'.,The following information is provided in response to the Jq y 13~ 1981 let- <br />ter from Brian E. Munson, Reclamation Specialist, regarding the Hayden <br />Gulch Mine Permit application. <br />Review Question <br />,': 2.05.04 <br />(2)(c) 2. Also, clarify why the depth of replaced topsoil inc eases from <br />1.4 feet in 1980 to 2.1 feet in 1985. This information was d rived from <br />the reclaimed acres in Table 2 and the topsoil replaced in'ITable 3. Also, <br />since the applicant states that there is an average of 27 ij~ches of topsoil <br />available, why. are stripping depths less than two feet? the a plicant is <br />advised to average alt depths from sampling sites in order to determine how <br />much topsoil is available. <br />Response <br />2. Topsoil depths increase due to the,fact that topsoil re~oved <br />prior to 1980 was not as deep as the. overall mine avc~rage.~ As <br />mining moves to the South, topsoil depths increase','. and ~~then <br />level out. <br /> <br /> <br />Based on field estimates by YTN, overall topsoil depths sf~ould <br />average 27 inches. However, the variability of topsoil within <br />the mining zone may range from approximately 5-34 inches. 7!hus, <br />the numbers used in calculating topsoil volumes are based ory es- <br />timated depths. Actual field operations will vary from ~hese <br />projected values. As previously explained in the topsoil h~ndl- <br />ing procedures, Hayden Gulch (H-G) will place cut staked prior to <br />topsoil removal so that it is clear to field superviso~;y per~son- <br />nel exactly how much a horizon is to be removed. <br /> <br />