An oil and debris stop hood by BMP is installed inside a reinforced precast concrete catch basin with a minimum three-foot sump. An anti-siphon vent consisting of one-inch PVC with a ninety-degree elbow connects to the top of the hood. The bottom of the hood sits one-half pipe diameter below the invert of the pipe. A grade adjustment ring sits at the top of the structure, and the snout is installed with a bio-skirt and trash screen.
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