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.z~ <br />~; <br />''' Primary GCL Layer <br />Granular Bentonite a°°' <br />G <br />c2 <br />L'n <br />Secondary GCL Collar- <br />1 ft. (300 mm. min. overlap; <br />8.3 When the GCL is placed over a horizontal pipe penetration, a "notch" should be excavated into the <br />subgrade around the penetration (Figure 12a). The notch should then be backfilled with granular <br />bentonite. A secondary collar of GCL should be placed around the penetration as shown in Figure <br />12b. It is helpful to first trace an outline of the penetration on the GCL and then cut a "star" <br />pattern in the collar to enhance the copal's fit to the penetration. Granular bentonite should be <br />applied between the primary GCL layer and the secondary GCL collar. <br />BENTOMAT/CLAYMAX Installation Guidelines <br />12 of 15 <br />CROSS-SECTION OF A HORIZONTAL PIPE PENETRATION I <br />