The SFPUC proposed project will stabilize three areas subject to flooding that results in severe erosion of the bank supporting John Muir Drive and the shoreline of Lake Merced in San Francisco, San Francisco County. A stacked boulder wall will be engineered at each project site. The stacked boulder wall will include a drilled pier acting as a retaining wall, geotextile fabric supporting riprap bedding and chinking, and large boulders acting as both a spillway and stilling basin for floodwaters. In addition, a loose riprap blanket will be placed at the base of the stilling basin to transition the floodwaters to a Bioengineered Zone with Coir biologs and shrub stakes. Plantings in the Bioengineered Zone would consist of stakes of native plants found in the vicinity of Lake Merced placed in Coir biologs to serve as sediment traps. The proposed project also includes a new alignment for the damaged handicap ramp. The California Department of Fish and Game is issuing Streambed Alteration Agreement Number 1600-2008-0340-3 pursuant to Fish and Game Code Section 1602, to the applicant, Ms. YinLan Zhang, San Francisco Public Utilities Commission.
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