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Continued... <br />The LLDPE geomembrane can easily accommodate significant differential or localized <br />settlement of the concrete underdrain ponds without rupture, should it occur. Even if elongation <br />due to differential settlement of the pond were to be confined to a localized area of the <br />geomembrane (i.e., worst-case scenario), the 80 -mil LLDPE could accommodate several inches <br />of differential settlement prior to rupture. Although such magnitude of differential settlement of <br />the concrete underdrain ponds is highly unlikely, it would be easily observed during routine <br />inspections, even when covered by the composite liner system. <br />Likewise adjacent panels of GCL will be overlapped a minimum of 9 -inches and 18 -inches on <br />panel ends. Differential settlement of the concrete ponds would also be accommodated by a <br />reduction of the GCL overlap while still providing a continuous, composite liner system. <br />Please do not hesitate to contact us at your earliest convenience if there are further questions or <br />concerns. <br />Sincerely, <br />Amec WI�ivironment & Infrastructure, Inc. <br />,� j, lam! <br />Andrea L. E <br />Senior Project Engineer <br />ec: Mr. Marc Tidquist, Sr. Environmental Coordinator, CC&V <br />Mr. Ron Roberts, Project Manager, CC&V <br />Ms. Katie Holybee, Document Control, CC&V <br />Mr. Ron DiDonato, Project Superintendent, CC&V <br />Mr. Scott Redabaugh, Project Superintendent, CC&V <br />Mr. Jeff Gaul, Project Superintendent, CC&V <br />Mr. Michael Moore, Project Resident, AMEC Foster Wheeler <br />Page 2 of 2 <br />