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GEOTECHNICAL STABILITY EXHIBIT <br />This information is presented to address the plan to mine <br />within 200 feet of the structures listed in Exhibit S. This <br />analysis is presented in leu of obtaining agreements from the <br />numerous owners of the noted structures. Thompson Properties, in <br />this application, has committed to mining slope adjacent to <br />structures at their final slope rate. Under the proposed plan <br />this would be 2:1 from the existing surface to the mine floor. <br />This leaves a stable slope of undisturbed gravel adjacent to the <br />structures. <br />The 25 foot setback from the property lines will be staked <br />prior to mining in the new. A second line will be staked to <br />establish the toe of the slope. Within the two stake lines is <br />were the 2:1 slopes will be created. <br />This method of creating slopes leaves a stable slope requir- <br />ing no backfilling or other work once complete. Over the years <br />we have found that the natural angle of repose for most gravel is <br />approximately 2:1 so it would be possible to mine within 50 feet <br />of a structure with a vertical face and be assured that no damage <br />would occur to the structure by a slope failure. Instead and for <br />safety reasons Thompson has chosen to use the method described <br />above. This will entail more work on their part but when done <br />will have created a stable final slope. <br />RECEIVED <br />SEP 13 ~LUUti <br />Division of ~eC8afety n1 <br />Mining and <br />35 <br />