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<br />6.2A <br />Page 21 <br /> <br />potentially occupied upland aquatic breeding habitat at the Newark Valve Lot. This would <br />include the shaft construction area, all stockpiling areas for excavated material, all construction <br />equipment laydown areas, and all vehicle operation areas and access roads, including the access <br />road to Willow Street. <br /> <br />. Mitigation Measure BIO-3a: Survey; salvage adult individuals for relocation; consult <br />with USFWS; relocate CTS; sample site for infectious diseases; identify and sample <br />alternative relocation sites; training of workers, supervisors, and managers; supervise the <br />hand-excavation of areas of potential adult habitat; restrict pipeline construction at the <br />Willow Street site to the dry season (May 1 to October 31); if construction must occur <br />during the wet season (November 1 to April 30), isolate potential breeding habitat from <br />Project work areas; install exclusion fencing; monitor initial ground-disturbing <br />construction activities at both the Newark Valve Lot and Willow Street locations. <br />. Mitigation Measure BIO-3b: Offset the temporary loss of CTS breeding and upland <br />aestivation habitat by rehabilitating and preserving comparable habitat at a ratio of 1.1 <br />acre for every acre affected (1.1: 1), offset permanent impacts on suitable breeding habitat <br />and upland aestivation habitat by rehabilitating and preserving comparable habitat at a <br />ratio of three acres preserved for each acre lost (3:1); acquire and preserve an additional <br />182,500 square feet (4.19 acres) of suitable California tiger salamander habitat at an off- <br />site location. <br /> <br />Impact BIO -4: Indirect impacts (i.e., disruption of breeding activity) on special-status <br />shorebirds including California clapper rail, California least tern, California black rail, <br />and western snowy plover and their habitat. <br /> <br />Suitable nesting habitat for the State- and federally listed California least tern and the federally <br />listed western snowy plover is present on sparsely vegetated flats and levees in the vicinity of the <br />Ravenswood shaft site, but no individuals are known to occur in the immediate vicinity of the <br />construction limits. If these species were to nest within 100 feet of construction, significant <br />impacts could result from the harming of individuals and the disruption of breeding behavior <br />during excavation and shaft construction. <br /> <br />. Mitigation Measure BIO 4a: Habitat assessment <br />. Mitigation Measure BIO 4b: Focused surveys; potential consultation with USFWS and <br />CDFG <br />. Mitigation Measure BIO 4c: Erect barriers <br />. Mitigation Measure BIO 4d: Contractor education program <br /> <br />Impact BIO ..5: Impacts on nesting western snowy plover. <br /> <br />Construction and operation of the pipeline would require periodic water discharges. During <br />construction of the pipeline and tunnel, water would be used to test the system for leaks. After <br /> <br />....... ..... .:.:.....:::~riri~h~~;.~~~:R~~~ri~~6~dbv~~~~rif~gr~u~d~t~i:~Wo~~~irifuaihe~h~~~~~~g~1.~6aJfd..he..... :.. .... <br /> <br />pumped, treated, and discharged (dewatering). During operations, maintenance of the tunnel <br />would require dewatering about once every 20 years. Water from the tunnel would be pumped, <br />treated, and discharged at the dissipater. The dry mudflats south of the Ravenswood Valve Lot, a <br />potential western snowy plover nesting habitat, would receive these discharges. If western snowy <br />plover were present, large discharges during the nesting season could result in flooding of nests, <br />mortality of young, or abandonment of nests with eggs. <br /> <br />. Mitigation Measure BIO 5: Survey and consultation with USFWS <br /> <br />Impact BIO -6: Impacts on juvenile steelhead. <br /> <br />11 <br />