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October 26, 1994 -3- 943-2732 <br />source. The vacuum was set at 15-inches of mercury, approximately twice <br />that of 8-inches recommended in the ASTM D4545 procedure. <br />OBSERVATIONS <br />80 mil VLDPE Geomembrane <br />Upon extraction of the liner cover fill from the mold, the VLDPE was moderately distressed <br />and scarred from the drain cover fill. The deepest scars appeared to be approximately 30 <br />mils deep. The bottom side of the geomembrane showed minimal distress after the test. <br />After removal and cleaning, the VLDPE exhibited no perforations when examined over a <br />light. source. Vacuum testing was performed on the specimen, and no pinholes where <br />observed. <br />Liner Coyer Fill <br />The liner cover fill showed minimal signs of distress from the loading. Five particles were <br />noted to break during the test. "The Rock" was intact after loading and orientation was with <br />the largest (heaviest) face on the geomembrane. <br />Soil Liner Fill <br />The surface of the soil liner till appeared to be more compact and flat after the load <br />application. <br />1 hope this quantitative information provides you with the partial data needed to aid in your <br />decision regarding the maximum particle size of the liner cover fill. The testing of the <br />biased orientation of "The Rock" is scheduled to start shortly and results should be available <br />soon. <br />Respectfully, <br />GOLDER ASSOCIATES INC. <br />David A. Kidd, P.E. <br />Project Manager <br />Geotechnical Engineering <br />Attachment: Photographs taken during testing <br />