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DORSEY & WHITNEY LLP <br />Division of Minerals and Geology <br />April 3, 2000 <br />Page 3 <br />housing development planned by Pinnacle. As stated in a report prepared for Pinnacle by its consulting <br />engineers: <br />Where unstable slopes are outside of development areas, they may not present a <br />hazard to structures. However, the steep slopes of the drainage feature may <br />progressively affect areas within a lateral distance of 1 to 3 times the vertical height of <br />the banks. Flood events can erode and fail large areas of these slopes, which can <br />encroach upon future development areas. <br />Lafarge should provide additional geotechnical information regazding this instability prior to any <br />approval of the Application. <br />2. Additional Information Needed. <br />Pinnacle believes that the Application does not adequately address the requirements of Rule 6.4 <br />because many of the exhibits submitted with the Application are lacking in required information. <br />Specifically, the following exhibits should be examined for adequacy. <br />Rule 6.4.1 Exhibit A. Exhibit A to the Application states only that the project is located in "A <br />portion of the NW 1/4" of the referenced Section ]0, T2S, R67W. This is not a description which is <br />"wholly adequate for field location of the property" as required by rule 6.4. I. <br />Rule 6.4.3 Exhibit C. This rule requires maps showing certain details. Pinnacle believes that <br />there aze concrete irrigation structures (lined ditches) which traverse the affected property and may <br />impact adjoining lands which are not shown in Exhibit C to the Application or elsewhere. See <br />Attachment 2. <br />Rule 6.4.5 Exhibit E. Rule 6.4.5(2) requires that an applicant discuss the post-mining use of the <br />affected land. Lafarge states that the end use of the lands affected by the Application will be a water <br />storage reservoir. Pinnacle is concerned that the lack of groundwater studies discussed in section 1 <br />~;~ 1 ~~above create a question as to advisability of using this site for storage of water, or wildlife use, after <br />{;f' mining is completed. Further, Pinnacle believes that the site will be too small and shallow for any public <br />yr/'~ ~, /Water supply entity to be interested in using this facility for water storage. The Application does not <br />I: ~~~ <br />