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• ADDITIONAL COMMENTS. <br />i <br />PIKEVIEW QUARRY <br />PERMIT NIN-77-211 <br />ENHANCED RECLAMATION NECO77ATIONS: Negotiations over enhanced reclamation are <br />continuing and nearing completion. It is possible that a result of the negotiations will be a <br />complete redesign of the remainder of the quarry, including the removal of as much as 26 to <br />27 acres of currently permitted but yet undisturbed land from the mining plan and the <br />production of an over excavation hole to make up for the removed reserves. <br />LANDSLIDE.. On ]anuary 4, 1993, a block of limestone approximately 25 feet thick and <br />covering about 5 acres moved about 300 to 500 feet down the mountainside. The slide <br />occurred on land that had not been mined by Castle Concrete but bad been mined previously <br />by Peter Kiewit and Sons in the 1950's when the Air Force Academy was built. The slide <br />occurred on a previously identified slip zone within the formation. This is the thud such slide <br />since the early 1970's. No further sliding occurred after the initial event. A monitoring <br />system was established on the slide azea by CTL Thompson as a part of then assessment of the <br />slide event, remedial measures, and judgment regarding the hazard. The company took <br />immediate action to initiate removal of the material, as recommended by CTL Thompson <br />geotechnical engineers, so no further sliding could occur. As a result of mining by Castle <br />Concrete, the slip zone is eliminated thereby removing all possibility for future mass wasting <br />of such large dimensions. The slide was reported to the Division. MSHA inspected the <br />operation shortly after the slide occurred, noticed that a slide had occurred and advised the <br />company to remove the material. MSHA did not express any additional concerns over the <br />safety 6a7ard. No additional steeply sloping material exists that could slide on the slip zone. <br />Two other clay seams father into the operation are potential slip zones but have never shown <br />activity in this or any other area. These other zones are also removed as a result of mining by <br />Castle Concrete. <br />Page 1 Supplemental Sheet M-77-211 1993 Annual Report <br />