(C-43) Sewer, sewage disposal, drain, and pipe laying contractor

To construct concrete and masonry sewers, packaged sewer disposal plants, sewage lift stations, septic tanks, and appurtenances thereto; to lay all types of piping for storm drains, water, and gas lines, irrigation and sewers, manholes in connection with the above work; and repairing and reconditioning of the pipelines, including the excavation, grading, trenching, backfilling, paving, and surfacing in connection therewith;