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relative maximum dry density of 95%, and a moisture content <br /> approximately 2% over optimum. The thickness of the compacted clay <br /> barrier layer was verified by using a backhoe or grader to check <br /> layer thickness at all grid points. After the thickness was <br /> verified by Kleinfelder, the holes were backfilled with 100% red <br /> clay and compacted. <br /> The portion of the clay barrier layer overlying the landfill's side <br /> slopes consists of a minimum of 30% red clay mixed with 70% select <br /> soil. The method for constructing the side slope portion of the <br /> clay barrier layer was the same as that described above for the top <br /> portion, however the mix proportions were an ill' to 1210 loose lift <br /> thickness of select soil underlying a 511 loose lift thickness of <br /> red clay to achieve a 70% select soil to 30% red clay ratio. The <br /> only exception to this method was a small area located in the <br /> southwest corner of the site (Drawing 2) . For this small area, the <br /> method was slightly different. An 11" to 1211 thick loose lift of <br /> select soil was placed on the Mixing Area shown on Drawing 2 . <br /> Approximately 30% red clay (approximately 511 loose thickness) was <br /> then placed and spread over the select soil material in the same <br /> manner as that stated for the top surface barrier layer. <br /> The same mixing procedure as that employed for the top and side <br /> slope surface areas was followed. After the final mixing pass with <br /> the addition of water, the clay barrier layer material was pushed <br /> over the side slope and spread with a Caterpillar model D-9N dozer. <br /> 11 <br />