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8 <br /> <br />• <br />It can be Seen from this Table that the thickness of the <br />soil cover varies between 6 and 74+ feet. For technical purposes, <br />a thickness of 25 to 30 feet will be assumed; unusually high soil <br />cover thickness found in boring A6 is probably related to large <br />landslides of the first group; it comprises proof that large <br />landslides do exist on the site. <br />2.3 INFLUENCE CF LANDSLIDES ON THE PROPOSED CONSTRUCTION <br />The implications of the landslides existence at the site and <br />their influence on the proposed construction were discussed at <br />several meetings with representatives of ARCO Coal Company and <br />Merrick and Company. The following recommendations have been made: <br />i; 1. From a geotechnical point of view, it would be prefer= <br />li <br />I. able to relocate the proposed surficial structures and facilities <br />~joutside the area of landslides as defined in this study and by <br />ii previous investigations. If, for other reasons, the relocation is <br />(!not desirable, it has to be expected that increased construction <br />~icosts will be required to prevent renewal of old slide de- <br />iformations or the initiation of new slides, deformations or other <br />I! <br />~jstability problems. <br />2. The proposed construction should be designed so that it <br />(does not seriously influence the stability conditions of old <br />;landslides. Stability conditions could be influenced and new <br />'deformations or slides triggered by placing large fills or by <br />excavating large cuts at improper locations. Inappropriate <br />(changes in the drainage patterns would have a detrimental effects <br />ion stability as well. <br />~ 3. To avoid the risk of surficial slides, it will be <br />~~necessary to support most cuts that will be required within the <br />(slide area. They will include the mine portal cu[; it will be <br />• <br />i <br />4prRpnp COMaR1M6 K <br />