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INSTALLATION GUIDELINES <br />BENTOMAT <br />GEOSYNTHETIC CLAY LINERS <br />4.3 <br />The subgrade surface must be smooth and free of vegetation, <br />sharp -edged rocks, stones, sticks, construction debris, and <br />other foreign matter that could contact the GCL. The subgrade <br />should be rolled with a smooth -drum compactor to remove any <br />wheel ruts greater than 1 inch in depth, footprints, or other <br />abrupt grade changes. Furthermore, all protrusions extending <br />more than 0.5 inch (12 mm) from the subgrade surface shall be <br />removed, crushed, or pushed into the surface with a smooth - <br />drum compactor. The GCL may be installed on a frozen subgrade, <br />but the subgrade soil in the unfrozen state should meet the <br />above requirements. <br />SECTION 5 <br />INSTALLATION <br />5.1 <br />GCL rolls should be taken to the work area of the site in their <br />original packaging. The orientation of the GCL (i.e., which side <br />faces up) may be important if the GCL has two different types <br />of geosynthetics. Check with the project engineer to determine <br />if there is a preferred installation orientation for the GCL. If no <br />specific orientation is required, allow the roll to unwind from the <br />bottom rather than pulling from the top (Figure 5A). The arrow <br />sticker on the plastic sleeve indicates the direction that the GCL <br />will naturally unroll when placed on the ground (Figure 6). Prior to <br />deployment, the packaging should be carefully removed without <br />damaging the GCL. <br />5.2 <br />Equipment which could damage the GCL should not be allowed <br />to travel directly on it. Therefore, acceptable installation may be <br />accomplished whereby the GCL is unrolled in front of backwards - <br />moving equipment (Figure 7). If the installation equipment <br />causes rutting of the subgrade, the subgrade must be restored <br />to its originally accepted condition before placement continues. <br />5.3 <br />If sufficient access is available, GCL may be deployed by <br />suspending the roll at the top of the slope, with a group of <br />laborers pulling the material off of the roll, and down the slope <br />(Figure 8). <br />5.4 <br />GCL rolls should not be released on the slope and allowed to <br />unroll freely by gravity. <br />2870 Forbs Avenue Hoffman Estates, IL 60192 <br />841851.1800 1 800.527.9948 <br />-6- <br />FIGURE 5 A & B <br />"NATURAL' ORIENTATION (5A) <br />TOP OF THE ROLL (5B) <br />FIGURE 6 - DIRECTION TO UNROLL GCL ON GROUND PER FIGURE 5A <br />