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File No. 20-1008-36 July 14, 1995 Idshk respectively. The mixing bar shall rotate at a minimum speed of 160 rpm. Moisture may be added for dust control, if needed. F. A minimum of one additional pass shall be made with the mixer, in which moisture shall be uniformly added by injecting water into the mixing chamber. The prepared mixture shall be brought to a moisture content of 2 percent above optimum prior to the start of compaction. Mixing shall continue until a minimum of 98 to 100 percent of the mixed material passes the 1-inch sieve, a minimum of 60 percent passes the No. 4 sieve, and the moisture content of the mixture is uniform. The Contractor shall not begin any compaction of the clay barrier layer until the Engineer approves the mixing of the layer. G. The clay barrier layer shall be compacted in a single lift. The lift shall be compacted to obtain a minimum relative compaction of 95 percent (ASTM D-1557) for areas which receive 20 percent red clay, 92 percent for areas which receive 20 percent Ione clay, and 90 percent for areas which receive 30 percent red clay. Compaction shall be performed using a Caterpillar 825C sheep's foot compactor or approved equal. Sideslopes shall be compacted to a minimum relative compaction of 92 percent for Ione or 90 percent for 30 percent red clay with a CAT D-8 dozer, or equivalent. The finished surface of the clay barrier layer shall not be below the grade established by the Engineer, nor shall it be more than 0.05-foot above the grade. The measurements shall be taken from the bottom of the sheep's foot or dozer indentions. H. Areas which are not accessible to heavy construction equipment shall contain 30 percent import Granite red clay and 70 percent selected stockpile soil or 20 percent Ione clay and 80 percent selected stockpile soil for the clay barrier layer. These areas are also required to meet all specifications as contained herein, except that the soils shall be mixed at a convenient location. These areas shall be compacted by any method approved by the Engineer which will produce a minimum relative compaction of 92 percent for the Ione clay and 90 percent for the 30 percent red clay. I. Side slopes shall be compacted using a D-8 dozer or equal to obtain a minimum 92 percent relative compaction for Ione clay or 90 percent for 30 percent red clay. J. The barrier layer is to be constructed in a single-lift process. K. The lift shall be thoroughly compacted and satisfy moisture/density and permeability controls before a subsequent layer is placed. L. The daily work area shall extend a distance no greater than permits the maintenance of moist-soil conditions and construction operations. Desiccation and crusting of the lift surface shall be avoided as much as possible. GSM.-md CH/95 Page 23 of 31 July 14, 1995 20-1008-36(CQACOR) Copyright 1995,Kleinfelder,Inc.