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Mr. Michael Jewell To: This measure involves placement of rock slope protection; mostly to be installed on the land side of the Delta Front levees (Shima Tract, Tenmile Slough) to protect them from wave runup should the agricultural levees to the west fail during a flood event. Erosion protection for part of Duck Creek to protect the landside of the levee from floodwaters moving north which might wrap around the end of the levee is no longer proposed (see Consultation History). Some riprap will be required where the Smith Canal gate floodwall meets higher ground and may also be required similarly for the Fourteenmile Slough gate. Conventional quarry stone riprap is proposed. A sand filter will be installed prior to riprap placement. Equipment used will be dump or belly dump truck, dozer, and hydraulic excavator. The riprap will be placed in a two -foot -thick layer along the full face of the levee from toe to crown, or as -specified in plans for gate structures. 4. ADD the following to the Description of the Action, Conservation Measures: Delta Smelt, Avoidance and Minimization Measures, on pages 10-11, to follow the last such measure on page 11, as follows: Smith Canal gate structure: The following measures summarize those proposed by the applicant in the October 2018, BA, for permit application SPK -2016-00037: • In -channel work shall be restricted to low -flow periods between mid-July and mid- October, unless otherwise approved in writing by the Service • The applicant proposes the following fish protection measures for cofferedam construction and dewatering: • a qualified fish biologist will be on site to supervise and document fish rescue; • the biologist will determine capture/exclusion measures; oversee monitoring, handling, and release of captured fish; and maintain records of fish rescue activities and environmental conditions. • potential methods include seine, net, electrofishing, and others. The applicant will require the contractor to implement measures to minimize effects of underwater sound, as described in the BA; The applicant will develop and submit a hydroacoustic monitoring plan as described in the BA.