Environmental Impact Statement - Sonoma Land Trust

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California Department of Fish and Game U.S. Fish and Wildlife Service Chapter 2. Alternatives existing drainage system would instead be recontoured to the extent necessary to allow gravity flow of water from this area to the other two pump stations. Ditches within the SMART right-of-way would be improved to provide drainage within this area. An estimated total of 2,500 feet of conveyance ditches would be located on the diked baylands between Highway 37 and the railroad tracks. The two pump stations would convey stormwater that previously flowed by gravity onto the Dickson property from lands in between Highway 37 and the SMART rail line through the existing, or if deemed necessary by SMART, upgraded culverts in the railroad embankment and through the new flood control levee south of the rail line and into the tidal restoration area. The equipment expected to construct these new pump stations would include service trucks, an excavator or backhoe, generators and welders, and concrete trucks. Detention basins would be constructed at both pump stations to help compensate for reduced storage capacity within the project area, and facilitate water conveyance to the pumping facilities. The detention basins would be located to avoid or minimize potential impacts on delineated wetlands. Each pump station would consist of multiple pumps with different flow rates to accommodate a range of storm events. The system as a whole would be designed to provide protection equal to or greater than existing conditions as well as from a 24-hour, 100-year rainfall event. The detention basins would have an invert (bottom) elevation equal to or lower than the ditches flowing into to them. The shape of the detention basins would be irregular and their side slopes would be gently graded to encourage habitat development. However, the primary purpose for the detention basins would be stormwater detention and pumping, and routine maintenance of seasonal wetland vegetation within the basins would be performed as needed to maintain the capacity of the basins. Maintenance would also be performed on other parts of the stormwater conveyance system, and would include removal of debris and excessive sediment build-up that interferes with stormwater flow. All maintenance would be performed in accordance with applicable permits. At the downstream end of the main drainage for the site, near the southeast corner above C-17, a sump pond would be excavated to the approximate depth of existing ditch beds. This eExcavation of the detention basins is estimated to generate 853,000 CY of soil. This soil would likely be used to build other project features such as levees and berms near this site. The equipment used to excavate this basin would include an excavator and off-road trucks or scrapers and bull dozers. At maturity, the bed of the detention basins pond wcould support wigeongrass, which is widespread and abundant in existing ditches. Thus, itthey would have the potential to support numerous wildlife species, including California redlegged frogs. The pond would also provide stormwater detention and would serve as the sump pond for the new pump P-2. Outside the wet season, this pond would not be pumped so as to promote conditions suitable for California red-legged frog. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 2-23 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Chapter 2. Alternatives Maintenance of the detention basins would be completed in September/October, which is outside of the breeding season and after larval metamorphosis for California red-legged frogs. If maintenance were necessary at other times, a USFWS-approved biologist would conduct surveys for California red-legged frogs, and maintenance would be performed only if no red-legged frogs were detected. Access Road An access road would be constructed from Lakeville Road to the USFWS San Pablo Bay NWR headquarters (Figure 2-1). The access road would be constructed by raising a portion of Reclamation Road, and extending Reclamation Road. The primary purpose of the extensionaccess road is to allow school and tour buses signalized site access, as visitor uses are expected to increase over the coming years, and to provide a secondary access to the headquarters. Where it runs. Wet weather vehicular access would be provided to both pump locations to allow for maintenance. The access road would also serve maintenance vehicles for the portion of the alignment parallel to the SMART rail line, Reclamation Roadwould be raised.From the point where the access road diverges from the railroad tracks towards the Refuge headquarters, a maintenance access road would be constructed, continuing parallel to the railroad tracks and extended east to the pump station at culvert 17 (C-17) in order to allow access to both pump locations in wet weather, and a vehicle turnaround would be included at its eastern terminus at the C-17 pump station. Most construction activities would occur outside of the SMART ROW. SLT would obtain a construction permit for any construction activities within the SMART ROW. Approximately 2,2004,450 feet of the existing roadway would be raised to an elevation of +34 feet NAVD . In addition, a new segment of roadway, built extending beyond the existing private rail line crossing. The access road would then turn north/northeast for 3,600 feet, terminating at the Refuge Headquarters. A 3,700 foot maintenance road would extend from the turn in the access road to the eastern pump station (SP-2). The access roadway would have the same surface dimensions as the Reclamation Road extension. Both the improved and new roadway sections would have an approximately 26-foot top width and 2:1 to an equivalent elevation, would be extended east of the existing segment by 3,540 ft, and3:1 side slopes. Trail Segment 5a would parallel the new access road, and would be separated from the access road by a 2-foot vegetated buffer. The access and maintenance roads would require an estimated 6,100817,200 CY of material to construct. Both the improved, and new roadway sections would have a 12-foot top width and 2:1 side slopes. The equipment used to construct this these roads would include dozers, compactors, and water trucks. The roadway would continue north-northwest from the western pump station to the Refuge headquarters, straddling the present boundary between Dickson Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 2-24 April 2012
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Sears Point Wetland and Watershed R
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Sears Point Wetland and Watershed R
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Contents List of Tables ...........
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California Department of Fish and G
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Executive Summary This summary prov
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Table ES-1. Summary of Impacts and
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Table ES-1. Continued Page 3 of 141
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Section 3.2 Surface-Water Hydrology
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Table 3.5-2. Special-Status Species
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Sonoma Land Trust Chapter 4. Consul
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Sonoma Land Trust Chapter 7. Refere
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Environmental Impact Statement - Sonoma Land Trust

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