Background Mirasol Village is a $300 million mixed-income redevelopment in Sacramento’s River District that replaces the 1940s era Twin Rivers housing development and infrastructure. The area will be fully connected to new transit, employment centers, services, retail, and cultural amenities–creating a gateway to downtown Sacramento. The redevelopment included new backbone infrastructure, a community park and garden, and mixed-income housing. The onsite improvement included raising site grades by several feet using imported soil, construction of multiple two- to four- story multifamily buildings, and a five-story mixed-use podium structure. Site improvements included underground utilities, below-grade Chambermaxx® systems, a swimming pool, jointed plain concrete pavement, and pervious concrete. This project used a unique approach to store and infiltrate 100 percent of the design event runoff while optimizing the number of developable units. By incorporating below-grade Chambermaxx systems, stormwater planters, and pervious concrete, the design runoff was contained while still meeting water quality requirements.
Impact The backbone of this project was infrastructure that included new roadways, underground utilities, large stormwater planters, detention basins, and below-ground stormwater storage. The project also included other public improvements such as the construction of the Mirasol Community Park and Garden. The project used a unique approach to store and infiltrate 100 percent of the design event runoff while optimizing the number of developable units. Technical Aspects • Shallow infiltration testing as a part of 2016 geotechnical exploration, followed by supplemental infiltration testing at greater depths within the par basin • Corrective grading recommendations to remove and replace shallow silt with more pervious imported sand • Development for design criteria of 3 inches differential settlement over 50-feet of seismic conditions
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December 2023
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