5B CONSENT - Laserfiche WebLink

Home

4/7/20 (P:\TER2001\Delineation\San Leandro Treatment Wetland JD Revised 4‐7‐20.doc) 2 The Project Study Site includes a 4.3‐acre storage basin and adjacent upland areas owned by the City and managed by the San Leandro WPCP (Figure 3). The triangular‐shaped basin is located at the western end of the WPCP (Figure 3). The basin is bordered on the south and east by a tidal slough with direct connection to the San Francisco Bay, and on the north by the Oakland International Airport and the Metropolitan Golf Links course. The San Francisco Bay Trail runs along the northwestern edge of the basin. Other surrounding land uses include a gun club (property owned by the City), a waste transfer facility, and the Oyster Bay Regional Shoreline Area (a 194‐acre regional park operated by the East Bay Regional Park District). The storage basin maintains the physical appearance of an active salt pond, which is void of vegetation in all areas except the perimeter of the basin, with plant assemblages consistent with other heavily disturbed sites along the San Francisco Bay. The Project Study Site is accessed through the WPCP at 3000 Davis Street. Vegetation Vegetation within the Project Study Site includes salt marsh vegetation along the tidal slough and basin and trees, shrubs, and ruderal (weedy) plants along the banks of the basin, levee, and access road that surrounds the basin. Trees growing on the site consist of primarily ornamental species, such as acacia (Acacia sp.) and olive (Olea europaea), but at least one small native coast live oak (Quercus agrifolia) and native willow (Salix sp.) were observed along the bank of the basin. Shrubs observed include coyote brush (Baccharis pilularis), toyon (Heteromeles arbutifolia), Himalayan blackberry (Rubus armeniacus), and various ornamental shrubs. The non‐native ruderal and annual grassland vegetation includes several grasses and forbs, such as pampas grass (Cortaderia jubata), fennel (Foeniculum vulgare), wild oats (Avena sp.), brome (Bromus sp.), Italian rye grass (Festuca perennis), bristly ox‐tongue (Helminthotheca echioides), cheeseweed (Malva parviflora), and short‐ pod mustard (Hirschfeldia incana). A small patch of native blue wild rye (Elymus glaucus) was also observed along the upper bank of the slough. Appendix A provides a list of the plant species observed during LSA’s survey. Vegetation is sparse within the tidal slough and lower banks of the levee. Plants observed along the tidal slough consist of: pickleweed (Salicornia pacifica), fleshy jaumea (Jaumea carnosa), and cordgrass (Spartina sp.) along the lower tidal zone; saltgrass (Distichlis spicata) and marsh gumplant (Grindelia stricta var. angustifolia) along the middle tidal zone; and upland vegetation, such as pampas grass, fennel, and coyote brush, along the top of the slough’s levee. Soils Soils on the project site are mapped as Xeropsamments, fill and Xerorthents, clayey (UC Davis SoilWeb 2020). Neither soil is listed as hydric, except for depressions on the Xeropsamments, fill. Imported fill materials have been used to construct the wastewater treatment pond berms and the rock rip‐rap facing of the berm along the estuary. Hydrology The Project Study Site includes a wastewater treatment pond that formerly drained to the San Francisco Bay estuary through a flashboard controlled culvert, which is now plugged by tidal