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Sunnyvale hears green stormwater infrastructure update as permit tightens requirements
Summary
City staff told the Sustainability Commission that the regional Municipal Regional Permit's C.3 rules now apply at 5,000 sq ft of altered impervious surface, that Sunnyvale must find an additional five acres of treatment citywide, and that soil, space, maintenance and funding are major constraints to expanding green stormwater infrastructure.
Emma Hinojosa, the city's environmental programs manager for watershed protection, updated the Sunnyvale Sustainability Commission on Nov. 17 on the city's Green Stormwater Infrastructure (GSI) plan and the municipal regional permit requirements known as C.3.
Hinojosa said the GSI plan guides incorporation of low-impact development and engineered vegetated systems on public and private lands to reduce pollutant loads entering local creeks and San Francisco Bay. "C.3 is applicable to new and redevelopment," she said, describing the rule that now applies when a project alters 5,000 square feet or more of impervious surface. "If you expand beyond 50%, then you are required to treat all the storm water that would fall on your site or project area."
The presentation summarized three types of responses under C.3:…
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