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Mr. Mark Vanoni <br />Senior Environmental Coordinator <br />Certification Letter Phase NB/C Berm Raise <br />Project 84201125DO <br />November 6, 2008 <br />ameo, <br />the minimum acceptable peel strength of 96 ppi. The shear tests had strengths ranging from 145 to <br />236 ppi, exceeding the minimum acceptable shear of 112 ppi. <br />In addition to the trial seams, destructive seam testing was conducted to evaluate the extrusion seam <br />strength. Three (3) destructive seam tests were conducted for the 1,050 feet of seaming completed. This <br />exceeds the minimum testing frequency of one test per 500 feet of seam length, presented in the <br />Technical Specifications. Peel and shear tests were conducted on coupons cut from the seamed area. <br />The peel strengths ranged from 146 to 189 ppi, exceeding the minimum acceptable peel strength of <br />96 ppi. The shear tests had strengths ranging from 209 to 277 ppi, exceeding the minimum acceptable <br />shear of 112 ppi. The areas where destructive test coupons were obtained were double-patched (primary <br />as well as berm liner was patched) and vacuum tested. All vacuum tests passed. <br />Upon completion of the geomembrane installation, 6-inch PCPE drainage pipes were installed along the <br />inside edge of the berm raise and covered with DCF, according to the design. An as-built survey for the <br />installed drainage pipes is presented in Drawing 3. Figure 7 shows the typical installation of the 6-inch <br />PCPE pipe along the berm raise. <br />Based on the CQA observations and seam testing results, the Phase IVB/C berm raise was constructed <br />in accordance with the Amendment No. 8 Technical Specifications. <br />If you have any questions or comments, please contact me at (303) 433-0262. <br />Sincerely, <br />AMEC Earth & Environmental, Inc. <br />. Lupo, Ph.D., P.E. <br />Principal Engineer <br />JFL:rjg <br />Attachments <br />N?P REG?s <br />3 °??1 x!/,00. <br />-.'.. 111.1" <br />?N???nlrii Aitt <br />.w, <br />.w <br />MOCUMENTS AND SETTINGS%ROXANEUooel settlngaUemporaryintemet fifeslmnterd.oudooMe3rAwovaUm m raise cetiffcalion letter v3.doc <br />2