Rating System

LEED BD+C: New Construction, LEED BD+C: Core and Shell, LEED BD+C: Schools

Rating System Version

v3 - LEED 2009, v2 - Schools 2007, v2 - LEED 2.2

Inquiry

The project has a subterranean parking garage for 49 vehicles (19,247 sqft) that is within a mile of the Napa River. With this close proximity to the river and a high water table, the parking garage has ground water infiltration that is being pumped out at 1000 gallons per day. The captured ground water is being filtered (e.g. motor oil, fuels, paints/stains and solvents, asphalt products, concrete, herbicides, pesticides, and TSS, etc.) and pumped out of the garage to the city storm drain system, according to city code and San Francisco Bay Area Storm Water Management Agency Standards. The question is, could this captured ground water be used in the building as graywater for flushing toilets and urinals to offset potable water use and thereby qualify for LEED NC v2.2 Water Efficiency credits?