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Bay Area Clean Water Agencies | City of San Leandro Final Report | 19 Figure 6-2. Level 3 Upgrade Concepts for SLWPCP (1) Add metal salt and polymer chemical feed facilities to primaries for operating in CEPT mode, (2) add a parallel treatment MBR, (3) Retrofit the aeration basins to operate as a biological nutrient removal (BNR) reactor (4), add filters for denitrification and P removal (5) metal salt facilities for P removal (6) add external carbon source chemical feed facilities for MBR and denite filters