Laserfiche WebLink
(2/94) <br /> Sec. 10-1, Construction Details <br /> Std. Spec. Sec. 19 <br /> Special <br /> Page 3 of 4 <br /> E. The mixing chamber shall be set to a depth adequate to <br /> mix the 13-inch on-site selected soil layer with the 3 <br /> inch 20 percent imported Ione clay layer. Caution <br /> should be taken as not to mix the material with the <br /> foundation layer. A minimum of two passes shall be <br /> .' made with the mixer without adding any moisture to mix <br /> the 20 percent imported Ione clay with the 80 percent <br /> 8 on-site selected soil. The mixing bar shall rotate at <br /> a minimum speed of 160 rpm. <br /> F. A minimum of two additional passes shall be made with <br /> the mixer, in which moisture shall be uniformly added <br /> =» by injecting water into the mixing chamber. The <br /> �-� prepared mixture shall be brought to a moisture content <br /> between optimum and 3 percent above optimum prior to <br /> -= the start of compaction. <br /> :s- <br /> Mixing shall continue until a minimum of 98 percent of <br /> the mixed material passes the 1-inch sieve and a <br /> minimum of 60 percent passes the No. 4 sieve, and the <br /> moisture content of the mixture is uniform. The <br /> Contractor shall not begin any compaction of the clay <br /> barrier layer until the Engineer approves the mixing of <br /> the layer. <br /> G. The entire layer shall be compacted to obtain a minimum <br /> relative compaction of 95 percent (ASTM D-1557) . <br /> Compaction shall be performed using a Caterpillar 825C <br /> sheep's foot compactor or approved equal. The finished <br /> surface of the clay barrier layer shall not be below <br /> the grade established by the Engineer, nor shall it be <br /> more than 0.15-foot above the grade. The measurements <br /> shall be taken from the bottom of the• sheep's foot <br /> indentions. <br /> H. Areas which are not accessible to heavy construction <br /> equipment and the areas of 1. 75 to 1 slopes shall <br /> contain 35 percent imported Ione clay and 65 percent <br /> on-site selected soil for the clay barrier layer. <br /> These areas are also required to meet all <br /> specifications as contained herein, except that the <br /> soils shall be mixed at a convenient location and track <br /> walked onto the slopes. These areas will only be <br /> compacted by the track walking to approximately 85 <br /> percent relative compaction. <br />