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20 | Final Report Bay Area Clean Water Agencies | City of San Leandro Figure 6-3. Level 2 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