Project Site. San Francisco Bay. Primary Map Extent. San Lorenzo Creek. Oro Loma WWTP. Bockman Canal. Oro Loma Marsh.

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1 San Lorenzo Creek Oro Loma WWTP Project Site Bockman Canal San Francisco Bay Oro Loma Marsh Primary Map Extent Hayward Landing SOURCE: ESRI and OLSD, 2013 Figure 1 Project Location Map

2 Adaptation Solution: Realign Rapid landward movement increases as sea level rises A Progressive Solution: Ecotone Slope Treated Wastewater and Stormwater Wave Attenuation Overflow Seepage Rapid landward movement increases as sea level rises Mudflat Tidal Marsh Wet Meadow Freshwater Swale Demonstration Projects- Goals Wave Attenuation Overflow Seepage Rapid landward movement increases as sea level rises Mudflat Tidal Marsh Wet Meadow to provide a wet-weather equalization facility to refine seepage slope design that is adapted for future SL rise through experiment (off-line) Freshwater Swale SOURCE: PWA, 2010 Figure 2 Natural System Based Approach to Sea Level Rise Adaptation

3 Legend Proposed Features Primary Effluent Treatment Wetland Features Bay Trail & HW Grant Avenue Secondary Effluent Polished Secondary Effluent Realigned Drainage Channel Compensatory Wetlands Vegetated Swales (Stormwater Treatment) Existing Site Features Property Line Drainage Channel Bulrush Cell Cattail Cell Deep Pool Internal Berm Wetland Flowpath Headworks Equalization Junction $+ 2 $+ 3 & J EBMUD Drainge Channel Removed Existing Wetlands & HW & J & N & EP Nitrification Facility Ecotone Pump Structure Oro Loma Sanitary District Wastewater Treatment Plant $+ 1 & N $+ 9 $+ 5 $+ 4 $+ 6 & EP Bay Trail $+ 8 $+ 7 Bockman Canal SOURCE: ESA PWA, Primary Effluent Bypass to Equalization Basin + 4 Nitrified Secondary Effluent to Treatment Wetlands Equalized Flow Returned to Headworks + 5 Treatment Wetlands Equalization Basin Inflow/Outlfow Piping + 6 Ecotone Distribution Piping + 9 Ecotone Seepage Slope Ecotone Outflow Piping to Drainage Pump Station Containment Berm Oro Loma Wet Weather Equalization r Figure Site Plan

4 Headworks Primary Clarifiers Secondary Clarifiers Chlorine Contact From Collection System 1 To EBDA 2 Nitrification Tower EQ Basin/ Treatment Wetlands Ecotone Slope Drainage Ditch Intertie to Primary Effluent Bypass Channel, Route to EQ Basin Intertie to Secondary Clarifier Outlet Piping, Route to Treatment Wetlands EQ Flow Return Line, Route to Headworks Econtone Subsurface Flows, Route to Headworks SOURCE: ESA PWA, 2013 Figure 4 WWTP and Project Flow Schematic

5 LEGEND Wet meadow/fine grained soils Wet meadow/coarse grained soils Riparian scrub/coarse grained soils Mixed vegetation with depressions/swales French drain for mixing Sampling port/piezometer SOURCE: ESA; Peter Dr. Baye FIGURE ERROR! NO TEXT OF SPECIFIED STYLE IN DOCUMENT.-1. SCHEMATIC REPRESENTATION OF Figure 5 Schematic Representation of Ecotone Slope

6 Wetlands impacted (P) by ecotone slope (0.48 acre) Wetlands impacted (P) by wet weather equalization berm (0.54) Wetlands impacted (T) by realigned storm drain channel (0.15 acre) Waters impacted (T) by reaglined storm drain channel (0.01 acre, 109 linear feet) Wetlands impacted (T) by treatment wetlands (0.23 acre) Wetlands impacted (T) by vegetated stormwater swales (0.1 acre) Avoided Features Wetlands Other Waters Project Structures Ecotone Slope Treatment Wetlands Wet weather equalization berm Realigned Storm Drain Channel Vegetated Stormwater Swales Wetland Feature ID SOURCE:Monk and Associates, 2011; ESA Oro Loma Wet Weather Facility Figure 6 Waters of the U.S. Impact Map

7 Compensatory Mitigation Created wetlands (1.41 acres) Project structures Realigned storm drain channel Basin, treatment wetlands, ecotone slope SOURCE:Monk and Associates, 2011; ESA Oro Loma Wet Weather Facility Figure 7 Compensatory Mitigation - Created Wetlands