ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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Alkali milk vetch is in the pea family. It is an annual herb with pink to purple flowers that grows at the edges of vernal pools,often on alkaline soils. Although vernal pools are not known to be present in the project area, ponded water in annual grassland habitat that could support this species was observed adjacent to the project area during the reconnaissance survey. San Joaquin spearscale and lesser saltscale are annuals in the goosefoot family. Both grow in vernally mesic saline or alkaline habitats, sometimes in annual grassland. Alkaline grassland is present on the proposed outfall pipeline route near the intersection of SR 120 and McKinley Road. Slough thistle is a robust, annual, or perennial herb in the daisy family that typically grows in freshwater marshes and swamps (usually sloughs) or riparian scrub habitats. Slough thistle occurred historically along the banks of the San Joaquin River in the vicinity of the project area and could occur on the south bank of the San Joaquin River at the location of the proposed outfall structure. Freshwater marsh in the project area provides marginal habitat(or habitat of questionable or minimal quality)for slough thistle in comparison to the large slough marshes where populations of this species are known to grow. Recurved larkspur is in the buttercup family. It is a perennial herb that grows to 2.5 feet tall and has pink flowers. Recurved larkspur grows on poorly drained, alkaline soils in grassland and could grow on alkaline grassland present on the proposed outfall route near the intersection of SR 120 and McKinley Road. Delta button celery is state listed as an endangered species.It is a perennial herb in the carrot family with tiny flowers arranged in spherical clusters with spiny bracts.Historically, it grew on the floodplain of the San Joaquin River in clay soils, and a sighting was recorded just north of the project area along the river. The south bank of the San Joaquin River at the location of the proposed outfall structure provides marginal habitat for this species. Rose-mallow is a robust, aquatic, emergent perennial herb in the cotton family. This species grows in freshwater marshes and swamps and along sloughs within the Delta watershed and is known to grow on riprap. Freshwater marsh in the project area and the riprap at the proposed outfall structure on the bank of the San Joaquin River provide suitable habitat for this species. Delta tule pea is in the pea family. It is a perennial, climbing herb with pink to purple flowers.Alkali milk vetch grows in freshwater or brackish marshes of the Delta and could grow in marshes in the project area. Delta mudwort is a diminutive perennial in the figwort family found in the Delta and on the east coast of the United States. It has small,narrow leaves and white to lavender-blue flowers. It is frequently found in micro habitats where bank sloughing and other similar disturbances have created localized areas of saturated fine sediment(clay and silty clay) deposition below the average high-tide level. The French Camp Outlet Canal and the bank of the San Joaquin River in the project area provide marginal habitat for this species. Sanford's arrowhead is a perennial, emergent herb in the water-plantain family. This species grows in assorted shallow freshwater marshes and swamps, including irrigation canals. Freshwater marsh in the project area provides suitable habitat for this species. Wright's trichocoronis is an annual herb in the daisy family that typically grows in moist places such as floodplains,rice fields,marshes and swamps,riparian scrub and vernal pools, and often in alkaline areas. Wright's trichocoronis occurred historically in mud and on floodplains along the banks of the San Joaquin River in the vicinity of the project area and could occur on the south bank of the San Joaquin River at the location of the proposed outfall structure. The French Camp Outlet Canal and its tributaries, as well as the bank of the San Joaquin River,provide marginal habitat for this species in the project area. Greene's tuctoria is federally listed as endangered and state listed as rare. It is an annual herb in the grass family with glandular flowers. It grows in vernal pools in annual grassland. Although vernal pools are not known to be EDAW Manteca WQCF and Collection System Master Plans EIR Terrestrial Biological Resources 4.5-18 City of Manteca