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4.4 <br />Our Job 81-20-00 Page B- 7 <br />relative compaction of at least that specified in this report, <br />as determined by the applicable laboratory compaction tests. <br />Unusual geologic or soil conditions requiring deeper <br />treatment, such as landslides, slurnps , tree basins or com- <br />pressible soi1, are specifically discussed in this report or <br />in memoranda issued during construction. All areas prepared <br />to receive fill are to be approved by the Consultant prior to <br />placement of fi11. <br />KE)'WA)'S <br />In general, keyways are constructed to provide support <br />for all fill masses placed upon natural slopes with an incli- <br />nation steeper than five horizontal to one vertical and/or <br />compressible natural soi1. This includes all sidehill fill <br />masses, end slopes of canyon fill masses and fill over cut <br />s lopes . <br />In addition to the itens listed above, all buttress <br />and other special structural fill nasses are to be constructed <br />with keyways as deternined by stability analyses. <br />The keyways will be excavated into firm earth <br />material as approved by the Consultant. Plates B-2.1 and <br />B-2.2 - Typical Sidehill FiIl Mass and Plate B-3 - Typical <br />Buttress Fi11 illustrate typical keyways.