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i <br />i $ <br />-. ~ It can be seen from this Table that the thickness of the <br />' - I 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 OF 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 />' ii 1. From a geotechnical point of view, it would be prefer- <br />' I able to relocate the proposed surficial structures and facilities <br />~iloutside the area of landslides as defined in this study and by <br />i~lprevious investigations. If, for other reasons, the relocation is. <br />' - ~noC desirable, it has to be expected that increased construction <br />~,~costs will be required to prevent renewal of old slide de- <br />liformations or the iniCiation of new slides, deformations or other <br />~ stability problems. <br />!I 2. The proposed construction should be designed so that iC <br />' idoes 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 />' ~excavaCing large cuts at improper locations. Inappropriate <br />changes in the drainage patterns would have a detrimental effects <br />ion stability as well. <br />i <br />I~ <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 cut; it will be <br />I. <br />I <br /> <br />a.o«.o.o~.~..,~ <br />