ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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The proposed wastewater collection system would cross two irrigation ditches south of Lathrop Road and west of Airport Way(Exhibit 4.5-2b). These irrigation ditches are approximately 1,000 feet long and average 2-3 feet wide at their OHWM. The ditches receive water via irrigation supply valves at their western ends. The ditches are used to supply water to pasturelands located on their north and south sides and are not connected via a culvert to a drainage canal or other tributary of the San Joaquin River. However,they are located within 50 feet of a drainage canal.No water was present in these irrigation ditches at the time of the reconnaissance survey and no wetland vegetation was observed. Central Manteca Trunk Sewer The proposed wastewater collection system would cross an irrigation ditch at two points approximately 900 feet north of Yosemite Avenue and east of Airport Way(Exhibit 4.5-2a). The irrigation ditch is approximately 1,500 feet long and receives water via an irrigation supply control valve at its eastern end. The ditch is used to supply water to agricultural fields to the north and east via concrete aprons and is not connected to a drainage canal or other tributary of the San Joaquin River. The ditch is approximately 15 feet wide at its OHWM.No water was present in the irrigation ditch at the time of the reconnaissance survey and the adjacent agricultural fields were disked and fallow. A small amount of wetland vegetation,including common rush,tall flatsedge, and purpletop vervain,was observed in the western end of the ditch at the crossing point. Outfall Pipeline The proposed effluent outfall pipeline runs within 30 feet of a freshwater marsh located west of the main treatment pond on the Manteca WQCF property(Exhibit 4.5-2a). This marsh is dominated by common tule. At the location where the proposed outfall pipeline would cross the French Camp Outfall Canal,the channel was unvegetated, and where the proposed wastewater collection system would cross, freshwater marsh was present in the channel(Exhibit 4.5-2c). Recycled-Water Distribution System The proposed recycled-water distribution system would cross an irrigation ditch and three drainage canals south of Woodward Avenue and west of McKinley Way(Exhibit 4.5-2c).No water was present in the irrigation ditch and drainage canals at the time of the reconnaissance survey and no wetland vegetation or freshwater marsh habitat was observed. The proposed recycled-water distribution system would also cross an irrigation ditch at two points approximately 900 feet north of Yosemite Avenue and east of Airport Way(Exhibit 4.5-2a). As described above,the irrigation ditch is approximately 1,500 feet long and is used to supply water to agricultural fields to the north and east, and is not connected to a drainage canal or other tributary of the San Joaquin River.No water was present in the irrigation ditch at the time of the reconnaissance survey and the adjacent agricultural fields were disked and fallow. Riparian Habitat The proposed side-bank outlet structure for the outfall pipeline would be positioned on the east bank of the San Joaquin River,just south of the Union Pacific Railroad bridge(Exhibit 4.5-2). The outlet(or outfall) structure would consist of a concrete junction manhole for maintenance access, a headwall structure, and a concrete spillway to the river edge. Riprap would be provided at the bottom of the spillway for erosion protection and to dissipate energy during peak flows. A relatively few number of riparian species typical of Great Valley riparian forest and Great Valley willow scrub are present on the east bank of the river. Higher numbers of these riparian species are present on the river's west bank. Dominant species included valley oak(Quercus lobata),Fremont's cottonwood(Populus fremontii), Manteca WQCF and Collection System Master Plans EIR EDAW City of Manteca 4.5-13 Terrestrial Biological Resources