501 UNDERDRAINS
502 CONCRETE ITEMS
505 GUARDRAIL AND STEEL MEDIAN BARRIERS
507 FENCES
510 RELOCATING OR MODIFYING EXISTING MISCELLANEOUS ITEMS
511 ALLAYING DUST
512 MAINTAINING TRAFFIC
513 MOBILIZATION
515 PLANING OR MILLING PAVEMENT
521 PAVERS
530 ABANDONMENT OF EXISTING PIPELINES AND STRUCTURES
531 CONTAMINATED GROUNDWATER MANAGEMENT