237310
Highway Street and Bridge Construction (specifically: Pavement, specialty placement of materials: brick, bluestone, etc., (no concrete or asphalt paving); bridge abutments, culverts and roadways [including the approaches] on highway projects [construction of MSE panel, segmental block, welded wire and basket retaining walls, and precast sound wall systems]; paving work on medians, walkways, access roads; the construction of brick, unit porous and natural stone paving, (no poured concrete or asphalt (paving) work)
237990
Other Heavy and Civil Engineering Construction (specifically: non-highway related retaining wall construction work to include, but not be limited to: parks, schools and airport projects [MSE panel, segmental block, welded wire and basket retaining walls; precast sound wall system]; paving work on non-highway related projects i.e. parks, schools, etc.: the construction of brick, unit, porous and natural stone paving. No poured concrete or asphalt (paving) work. Sediment Control System construction.
238140
Masonry Contractors (specifically: retaining walls)
238910
Site Preparation Contractors (Specifically: backfilling)
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