During our 16-hr Rural Water Supply Operations Seminar in Johnson County, Iowa last month we had the opportunity to see another version of dump tank signage used to help guide tanker drivers. The folks used numbered signs on the dump tanks...AND...had a firefighter display a handheld sign visible to the tanker drivers as tankers approached the dump site. The firefighter's signs were constructed such that they could be "flipped" to the correct number based upon the direction of the Dump Site Officer and in preparation for the next arriving tanker. When the tanker approached the dump site, the signaling firefighter "caught the eye" of the tanker driver, displayed the sign, and the tanker driver proceeded to the correct dump tank.
We were very impressed at how well this simple tool kept the offloading process under control.