Laserfiche WebLink
the RS500. The depth was increased to eighteen inches to scarify <br /> the top surface of the foundation layer to promote better layer <br /> bonding. The sixth and final step was to compact the layer with a <br /> Caterpillar model 825C sheepsfoot compactor. The top surface <br /> portion of the clay was compacted to a relative maximum dry density <br /> of 95%, and a moisture content approximately 2% over optimum. The <br /> thickness of the compacted clay barrier layer was verified by using <br /> a backhoe to pothole at all grid points. After the thickness was <br /> verified by Kleinfelder, the holes were backfilled with an 80/20 <br /> native/Ione clay mixture and compacted. Grades for the clay <br /> barrier layer were verified by the County's survey crew. <br /> The portion of the clay barrier layer overlying the landfill's side <br /> Aftslopes consists of a minimum of 35% Ione clay mixed with 65% select <br /> on-site soils. The method for constructing the side slope portion <br /> of the clay barrier layer was slightly different. First, the <br /> distance from the top edge to the bottom toe of the side slope was <br /> measured. Stakes were then placed on the top surface set back from <br /> the top edge to mark this distance. A 13" to 1411 thick loose lift <br /> of select on-site soils was then placed within this boundary. <br /> Approximately 35% Ione clay was then placed and spread over the <br /> native material in the same manner as that stated for the top <br /> surface barrier layer. <br /> The same mixing procedure as that employed for the top surface was <br /> followed. After the final mixing pass with the addition of water, <br /> 11 <br />