Detectable warning surfaces require specific yellow coloring matching Federal Standard 595C and placement within six to eight inches of the curb line per California Building Code requirements. The concrete curb drain assembly features a lid designed for H-15 loading with recessed closure bolts and a skid-resistant diamond plate surface resting on Portland cement concrete. The subbase consists of six inches of Portland cement concrete, four inches of Class 2 aggregate base, and eight inches of non-expansive fill over compacted subgrade.
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