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Our Job 81-20-00 Page B-9 <br />dations for benching and subdrains are discussed in the <br />geotechnical report or memoranda issued on a particular <br />proj ect . <br />Fi11 lrlasses Abo\re Cut Slopes. Pr eparatory grading <br />for fill slopes shal1 completely renove the soft earth <br />material at the contact between fill slope and existing or <br />future cut s1ope. Plate B-?.2 - T1,pica1 Sidehill Fi11 }lass <br />illustrates a typical benching requirement for such a fi11. <br />Specific recommendations for benching and for sidehill fill <br />drains are discussed in the geotechnical report or nemoranda <br />issued on a particular project. <br />Buttress Fi11 Masses. Buttress fill masses are <br />to be placed on the excavated interface benched into firn <br />earth material. Plate B-3 - Typical Buttress Fi11 illustrates <br />the typical design required. Benches may either be built <br />as the excavation for the buttress is made or as the fill <br />is being placed. <br />4 .54 <br />4.55 <br />4.56 <br />4.6 <br />Other Fi11 Masses.The design of other special fill <br />masses will be discussed specifically in the geotechnical <br />report on a particular Project. <br />SUBDRAINS <br />General. Subdrains are to be installed (a) below <br />canyon fill masses after the striPping operations are <br />completed and prior to placing of fil1, and (b) behind <br />sidehill buttress or stabilization fill tnass prior to their <br />placenent, when reconmended by the Consultant. <br />4.61