RWF Construction, LLCLogo Design Contest

We are a water and sewer utility construction firm, we are not plumbers. We install underground water and sewer pipes for municipalities when they extend or upgrade their system. We also work on sewer lift stations and water/sewer treatment plants. We are interested in a logo for shirts, jackets, business cards, and to place on equipment that can easily identify our company, even at a distance. A simple logo can accomplish this using large font for "RWF" but as one looks closer to the logo it says something about our company maybe by showing an excavator or pipe. We recently started using "Rockwell" as our font on letters and emails.

A few of our ideas were solid black. A clean blue could be used to symbolize clean water. Yellow is okay if a piece of heavy equipment is used. Common colors for material we install is red for fire hydrants and valves, blue for water pipe and green for sewer pipe.

The best we could come up with had two lines, the top was "RWF" in a larger font and the bottom was "CONSTRUCTION". Construction was inside the tracks of an excavator and out of the W in RWF was the boom of the excavator with the bucket beyond the F. We were not able to get the proportions correct or the excavator bucket to look real.
Another thought was to make RWF out of pipe and fittings.

Hurricane Florence is affecting our area so I may not respond for a few days depending on power and internet service. Please continue your work and I'll try to respond as soon as possible. Thank you.