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BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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• Ensure that site conditions allow for sufficient hydraulic head from the inletto the outlet. Most designs require that the outlet is a minimum of 4 feetbelow the inlet.• Construct baffles from a noncorrosive material, such as concrete, stainlesssteel, or a fiberglass reinforced plastic.• Most designs target a maximum allowable velocity of stormwater throughthe inlet of 0.5 cubic feet per second.INSTALLATION CONSIDERATIONSRefer to manufacturer’s instructions for proper installation guidelines.INSPECTION AND MAINTENANCE• Where applicable, follow maintenance requirements specified for theproprietary system installed.• Inspect at least twice per year and after significant runoff events.• Use <strong>BMP</strong> Rapid Assessment Methodology (RAM) protocols pertaining totreatment vaults to establish benchmark and threshold standard criteria formaintenance and material removal.• Use a stadia rod to measure the amount of accumulated sediment andmaterial in the settling chamber.• Most units are designed to be cleaned by a vactor truck or functionallyequivalent equipment.• Properly dispose of material and standing water.EFFECTIVENESS CONSIDERATIONSBaffle vaults can be effective at removing grease and oil when properlydesigned, constructed, and maintained. Baffle vaults are not considered effectivefor removal of pollutants of concern for lake clarity (i.e. fine sediment particlesand species of nitrogen and phosphorus). Baffle vaults when properlymaintained can be successful pretreatment devices that increase theeffectiveness of downstream <strong>BMP</strong>s by reducing loads of coarse sediment andother gross pollutants to downstream <strong>BMP</strong>s.TRPA <strong>BMP</strong> HandbookChapter 4: <strong>BMP</strong> Toolkit2012 4.4.2.3-Baffled VaultPage 3

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