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Cover Alternatives Analysis <br />Alternative 1: Polyethylene Geomembrane Overlain by <br />Engineered Synthetic Grass <br />Advantages Disadvantages <br />• Geomembrane layer is essentially • Generates more storm water runoff <br />impermeable. than other alternatives. <br />• Shorter construction time. • Sand layer and binder mixture <br />• Reduced post closure maintenance required and must be reapplied <br />costs. periodically. <br />• Will not provide a habitat for birds • Repair and replacement of the <br />that may pose a hazard to air cover may eventually be required. <br />navigation. <br />