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12 | Final Report Bay Area Clean Water Agencies | City of San Leandro Figure 4-1. Optimization Concepts Considered for SLWPCP (1) Add metal salt and polymer chemical feed facilities to primaries for operating in CEPT mode, (2) operate the aeration basins in series and add an anoxic zone and blower, and (3) provide piping/pumping to operate in step feed mode (requires implementation of concept (2))