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Bay Area Clean Water Agencies | City of San Leandro Final Report | 21 Figure 6-4. Level 3 Upgrade Aerial Layouts for Dry Season and Year Round (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) ferric facilities for P removal (6) add external carbon source chemical feed facilities for MBR and denite filters