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3.9 Cover Placement <br /> A. Cover soils shall be free of angular stones or other foreign matter that could damage the <br /> GCL. Cover soils should be approved the project Engineer with respect to particle size, <br /> uniformity and chemical compatibility. Cover soils with high concentrations of calcium <br /> (e.g., limestone, dolomite) are not acceptable. <br /> B. Soil cover shall be placed over the GCL using construction equipment that minimizes <br /> stresses on the GCL. A minimum thickness of 1 foot (300 mm) of cover should be <br /> maintained between the equipment tires/tracks and the GCL at all times during the <br /> covering process. This thickness recommendation does not apply to frequently <br /> trafficked areas or roadways, for which a minimum thickness of 2 feet (600 mm) is <br /> required. <br /> C. Soil cover should be placed in a manner that prevents the soil from entering the GCL <br /> overlap zones. Cover soil shall be pushed up slopes, not down slopes, to minimize <br /> tensile forces on the GCL. <br /> D. Although direct vehicular contact with the GCL is to be avoided, lightweight, low ground <br /> pressure vehicles (such as 4-wheel all-terrain vehicles) may be used to facilitate the <br /> installation of any geosynthetic material placed over the GCL. The GCL supplier or CQA <br /> engineer should be contacted with specific recommendations on the appropriate <br /> procedures in this situation. <br /> E. When a textured geomembrane is installed over the GCL, a temporary geosynthetic <br /> covering known as a slip sheet or rub sheet should be used to minimize friction during <br /> placement and to allow the textured geomembrane to be more easily moved into its final <br /> position. <br /> IMPORTANT:The information contained herein supersedes all previous printed versions;and is believed to be accurate and reliable.For the most <br /> up to date information.please visit www.CETCO.coni.CETCO accepts no responsibility for the results obtained through application of this product. <br /> CETCO reserves the right to update information without notice. <br /> 2870 Forbs Avenue Hoffman Estates, IL 60192 <br /> 847.851.1800 1 800.527.9948 <br /> www.CETCO.com <br />