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Mr. Berhan Keffelew, DRMS <br />October 4, 2011 <br />Page 2 <br />The project will also include the installation of Bentomat ST which will serve as the sub - <br />grade for the LLDPE. The Bentomat ST will be installed per specifications as outlined in <br />attachment entitled "Section 02776.2 Geosynthetic Clay Liner (GCL) ". <br />The geosynthetic components will overlay a one (1) foot layer of bedding fill, and be <br />overlain by a two (2) foot layer of bedding fill. As outlined in attached AMEC drawing No. <br />A110, the bedding fill shall consist of material meeting the requirements of low volume <br />solution collection fill in accordance with attached specification "Section 2200.0 <br />Earthworks ". <br />Please also refer to the following attached AMEC drawings for additional detail: Dwg No. <br />A100 - "LOB Liner Extension Existing Conditions and Proposed Grading ", Dwg No. A105 - <br />"LOB Liner Extension Proposed Excavation Plan, Isopach and Control Points ", and Dwg <br />No. A110 - "LOB Liner Extension Sections and Details ", all dated September 20, 2011. <br />Construction quality assurance will be provided by AMEC. An as -built report will be <br />submitted to DRMS in a timely manner upon completion of the project. <br />VLF Phase IV Perimeter Berm Raise (or previously named "Liner Extension ") <br />This project includes the construction of an enhanced containment berm along the Phase IV <br />liner perimeter in order to increase the capacity of the area to withstand upset process <br />solution conditions. This is an extension toward the west of a previously completed project <br />referenced in Technical Revision No. 52 dated October 30, 2008. <br />Initially, the existing liner will be exposed by the removal of the existing Drain Cover Fill <br />(DCF) in the area. A new containment berm approximately 345' in length and a minimum of <br />2' in height with a 2' flat top will be constructed directly over the existing anchor trench. <br />Select structural fill will be utilized for the berm material and it will be placed at angle -of- <br />repose slope. <br />The berm will be overlain with single -sided textured 60 or 80 mil Linear Low Density <br />Polyethylene ( "LLDPE "), installed by a qualified liner contractor under the same <br />specifications used on the VLF. Incidentally, the textured LLDPE will be installed with the <br />textured side down. <br />The liner will be extrusion welded to the existing exposed liner approximately 2' from the <br />toe of the newly constructed berm. The liner will also be anchored along the perimeter road <br />berm without impacting the existing key trench. <br />Please also refer to the following attached AMEC drawing No. 1 - "Berm Raise Alignment <br />and Profile" dated May 6, 2011 for additional detail. Construction quality assurance will be <br />provided by AMEC. An as -built and certification report will be submitted to DRMS in a <br />timely manner upon completion of the project. <br />