Box Building, Lids, & Masonry: Build, modify, and repair catch basins, drop inlets, junction boxes, and ditch bottom inlets using concrete masonry units (CMU), brick/mortar, or form-and-pour techniques; set, adjust, and replace damaged lids, ring-and-cover assemblies, and inlet grates to finished road/curb grade. Laser Survey & Grade Setting: Set up, calibrate, and shoot grades using rotating pipe lasers, builder's levels, and grade rods; calculate and verify slope percentages, fall, and flow-line invert elevations directly from blueprints, bench marks, or field schematics.