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Mal 011 <br /> WTI! <br /> Y' <br /> least 5 completed projects totaling not less than 1 million square feet (100,000 square <br /> meters). <br /> B. Testing of the GCL, as necessary to support the CQA effort, shall be performed by a <br /> third party laboratory retained by the Contractor and independent from the GCL <br /> manufacturer and installer. The laboratory shall have provided GCL CQA testing of the <br /> proposed or similar GCL for at least 5 completed projects totaling not less than 1 million <br /> square feet (100,000 square meters). <br /> C. CQA shall be provided in accordance with the GCL CQA Manual provided by the <br /> engineer. <br /> 2.0 PRODUCTS <br /> A. The GCL shall consist of a layer of granular sodium bentonite clay needlepunched <br /> between two geotextiles and shall comply with all of the criteria listed in this Section. <br /> B. Bentonite shall be a high-swelling sodium bentonite, with a minimum swell index of 24 . <br /> mL/2g and a maximum fluid loss of 18 mL. Bentonite shall be CG-50 granular bentonite, <br /> mined and processed by American Colloid Company. <br /> C. Bentonite shall have a granular consistency (1 percent max. passing a No. 200 sieve [75 <br /> [tm]), to ensure uniform distribution throughout the GCL and minimal edge loss during <br /> handling and installation. <br /> D. Prior to using an alternate GCL, the Contractor must furnish independent test results <br /> demonstrating that the proposed alternate material meets all requirements of this <br /> specification. Contractor must also provide evidence of successful use of the proposed <br /> alternate material on past similar projects. This evidence can include past direct shear <br /> results against similar materials under similar site conditions, and/or past <br /> permeability/compatibility test results with a similar leachate or waste stream. The <br /> Contractor also must obtain prior approval of the alternative GCL by the Project <br /> Engineer. <br /> 2.1 Materials <br /> A. Acceptable GCL products are Bentomat®ST, as manufactured by CETCO, 2870 Forbs <br /> Avenue, Hoffman Estates, Illinois 60192 USA (800-527-9948), or an engineer-approved <br /> equal. <br /> B. The GCL shall have the properties shown in the Bentomat ST Certified Properties table. <br /> C. The moisture content of the bentonite in the finished GCL shall be between 20 and 40 <br /> percent, to ensure uniform bentonite distribution, consistent needlepunch density, and <br /> adequate electrical conductivity to maximize leak location survey sensitivity. <br /> D. GCL shall be need lepunch-reinforced, with a minimum peel strength of 3.5 Ib/inch (610 <br /> N/m). To maximize large-displacement shear strength, GCL reinforcement shall be <br /> 2870 Forbs Avenue Hoffman Estates, !L 60192' <br /> 847.851.1800 1800.527.9948 <br /> www.CETCO.com <br />