Extensive Stormwater Improvement
RCI has provided extensive design and construction supervision for storm water improvement projects at the Heavenly Mountain Resort. The primary project objective is to achieve the storm water discharge standards within the Tahoe Basin. RCI professional services include projects to upgrade existing storm water facilities and ensure new construction projects have appropriate water quality BMPs that meet TRPA requirements.
One of the largest water quality improvement projects completed for Heavenly was the California Base Lodge Water Quality Improvement Project which involved 14+ acres of paved parking at the base lodge in South Lake Tahoe, California. Components of this project included: delineated snow storage areas with detention basins, riprap slope protection, soil amendments and revegetation for steep fill slopes, and French drains to intercept surfacing groundwater in the parking lot.
Stormwater Collection System
The storm water collection system, sized for the TRPA design storm event was also upgraded by separating clean groundwater and offsite runoff from the parking lot runoff; refurbishing existing pretreatment vaults, and constructing roughly 2,000 feet of new piping to route multiple discharge points to two points for treatment. RCI evaluated multiple treatment systems and selected the StormVault filter cartridge system as the best available technology.
Storm Vault System
The first system, installed in 2007, consisted of two (2) 6’ diameter low flow bypass vaults for nuisance flows, four (4) 11’ by 34’ pre-cast vaults to handle peak flow for a 1-inch per hour rainfall intensity, roughly 400 ZPG media filter cartridges, and three (3) automated Isco samplers to measure flow and collect flow-weighted water samples. The second smaller StormVault system, constructed in 2008, consisted of one (10) 8.5’ by 14’ precast vault with 28 high volume ZPG filter cartridges.