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2. Project Description <br />Figure 2.11. Conceptual rendering from the eastern edge of the proposed treatment wetland <br />Design Elements <br />The Proposed Project is comprised of the following major design elements, as summarized in Figure 2.12, <br />Project Overview: <br />a) Soil Relocation & Fill <br />The City intends to utilize the existing stockpile of soil generated from plant upgrades in the last decade, <br />overtopped by clean fill, to elevate the pond to the design grade. The existing stockpile is approximately <br />30,000 cubic yards, which is sufficient to raise the base of the basin by an average of about 5.5 ft. An <br />additional 11,000 cubic yards of clean fill, totaling approximately 41,000 cubic yards, is needed to raise the <br />basin to the final design height of 6.5 ft above mean sea level. <br />Stockpiled soil will be added to the existing sludge in the storage basin and stabilized with cement. Clean fill <br />will be placed on top of the stabilized soil/sludge mixture and an impermeable liner shall be affixed to the top <br />of the clean fill, which will become the bottom of the treatment wetland. The combination of cement <br />stabilization, clean fill, and an impermeable layer overtopping the existing basin and provides a stable and <br />elevated base while isolating low levels of legacy contamination from the overlying basin, as discussed in <br />Section 3.10, Hazards and Hazardous Materials. <br />San Leandro Treatment Wetland 2-8 February 2024 <br />IS/MND <br />