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<br />M-97-084/Adequacy Review <br />10/17/97 <br />page 2 <br />Exhibit C -Mining Plan <br />Item L describes how the excavation of material will improve the stability of the site, in that <br />material otherwise subject to natural transport will be removed. This is a key statement about the <br />mining operation, and should be further elaborated upon. Movement of material down the <br />mountain, through the gulch and onto the alluvial fan is the source of all the material. Removal of <br />material only within the permit area boundary will very likely contribute to significant instability <br />offsite, that is, to the unconsolidated material in the gulch. Since the present slopes are at the <br />angle of repose, onite material actually acts to buttress the offsite material resting upon the <br />material which is planned to be mined. Options for mining, without causing instability, may <br />include planning to simply "shave" off the outer surface of the fan without changing the slope, <br />mining the fan partially but placing stone revetment at the upper edge, or modifying the propsed <br />boundary to include the material within the gulch directly above the fan. <br />The site was observed to be well vegetated, predominantly with mature woody vegetation. Please <br />include in this exhibit a description of the removal or avoidance of these trees. <br />Prior to the commencement of mining, an access onto the site will have to be constructed. Please <br />describe its location and what it will consist of, and also depict it on the map. <br />The mining plan mentioned screening as the only processing to be carried out. Please indicate <br />where initial mining will occur and the direction it will progress, and where pitrun and processed <br />material will be stockpiled, etc. Please ensure that these features are depicted on the mining plan <br />map. <br />Exhibit D -Reclamation Plan <br />Please describe in more detail what will be done to ensure future stability of the site, i.e., drainage <br />patterns, erosion control, control of falling material, etc. Also please describe whether any of the <br />structures installed during the mining phase will remain or be removed during reclamation. These <br />items must be shown on the reclamation map also. <br />If woody vegetation was cut and piled during mining, please describe how it will be handled <br />during reclamation (removed, buried, burned, etc.). <br />The mining and reclamation plans include only the descriptions of fully mining the material down <br />to a level site. However, the Division also requires adequate information regarding the orderly <br />mining and reclamation of a partially mined site. Such a scenario is realistic, and must be <br />considered, not only for how the State may have to stabilize anon-level site, but also for <br />calculating the required bond amount. What is to be the maximum slope if the site is not fully <br />mined? <br />