When digging at a site with a benchmark set at 100 feet and requiring a ditch at 94 feet, what is the expected difference measured on the story pole?

To determine the expected difference measured on the story pole, it's essential to understand how benchmarks and finish elevations work in excavation and grading.

A benchmark is a known elevation that serves as a reference point for measuring other elevations on site. In this scenario, the benchmark is set at 100 feet. If a ditch needs to be created with an elevation of 94 feet, you calculate the difference between the benchmark and the required depth.

To find the difference, subtract the ditch's elevation (94 feet) from the benchmark elevation (100 feet):

100 feet (benchmark) - 94 feet (required ditch elevation) = 6 feet.

This calculation results in a difference of 6 feet. When using a story pole, which is a tool to help visualize the depth and height relative to established benchmarks, the expected measurement to indicate the required depth would be 6 feet. Therefore, positioning the story pole to reflect this difference directly correlates to the requirement for the ditch.

This thorough understanding captures why the expected difference on the story pole is 6 feet based on the provided elevations.