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KLEINFELDER <br /> 3 SOLID WASTE ASSESSMENT TEST INVESTIGATION <br /> The first stage of solid waste assessment activities consisted of assessing the physical and <br /> chemical characteristics of the vadose zone and leachate beneath the landfill. Drilling <br /> activities commenced May 9 and continued through May 12, 1989. <br /> The second stage of solid waste assessment activities consisted of the installation and <br /> development in June 1989 of two ground water monitoring wells. The two wells (MW-1 <br /> and MW-2) and the one site domestic well (LW-1) were sampled in July 1989, October <br /> 1989, January 1990, and April 1990 to satisfy ongoing ground water monitoring as <br /> prescribed in the site Waste Discharge Requirements. <br /> 3.1 VADOSE ZONE ASSESSMENT <br /> 3.1.1 Drilling <br /> Five borings were drilled following the protocol discussed in the Field Activities Protocol _ <br /> (Appendix A). Four of the borings were drilled and sampled to assess the vadose zone <br /> under and around the landfill. <br /> To assess the vadose zone and leachate below the landfill, two borings (B-1 and B-2) were <br /> drilled through the landfill. B-1 was positioned in the approximate area of the oldest <br /> known fill material. The depth of fill was estimated to be approximately 60 to 70 feet. B-2 <br /> was drilled in an area that was more recently filled. The depth of fill in this area was <br /> unknown, but was assumed to be between 30 and 60 feet. <br /> The borings drilled within the fill material, B-1 and B-2, were advanced slowly and <br /> carefully to detect changes in the consistency of material so that the geologist could collect <br /> samples at, and 10 to 20 feet below, the interface between fill material and the native soil. <br /> In B-1, the contact between fill and native soil was encountered approximately 65 feet <br /> below the surface. At B-2, the contact was encountered approximately 35 feet below the <br /> surface. <br /> FOOTHILL 16 <br />