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r <br />Pa,yr 3 <br />Geotechnical Stability Exhibit <br />Condition of Permit Approval: <br />L <br />No portion of the quarry highwall will be constructed (mined) to slope angles steeper than the <br />granite east joint dip without prior approval by the Division. Castle Concrete will report to the <br />Division, as soon as the granite is exposed, the east joint dip and the bench highwall slope <br />angle for each cliff (bench highwall) at approximately the north and central ridge locations. <br />Castle Concrete will report the dip and slope angle at these two locations for each new bench <br />highwall until the final granite portion of the highwall configuration is completed. The report <br />will be prepazed and signed by a registered geotechnical engineer or other qualified engineer, <br />and include an analysis of the stability of that cliff (bench highwall) as it relates to the overall <br />stability of the amendment area quarry highwall. If such an analysis reveals potential highwall <br />stability problems, Castle Concrete will propose a modification to the mining plan to eliminate <br />the instability problem. <br />enclosure- DOW letter <br />