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Page 2 • <br />' November 29, 1991 <br />Berhan Refellew <br />M-73-7 <br />We are sorry this is taking longer than expected and we hope you <br />understand that mapping this large of a site to the detail required is a <br />major project that takes a considerable amount of time. Furthermore, <br />calculating volumes requires having the computer sort through well in <br />excess of 25,000 data points in the digitized map. Even a fast machine <br />requires a lot of time to gather together all the points for a <br />particular pile of material and then calculate a volume. We are working <br />as rapidly as possible to complete the information requested in your <br />inspection report and will be in touch early next week. <br />Respectfully, <br />Mark A. Heffner <br />cc; Bud Herskind <br />