Precision Leveling of Drain Field Trenches

What happens here

The narrator explains the meticulous process of leveling the drain field trenches. A worker is shown in a trench using a grading stick (sometimes referred to as a level rod or survey rod) in conjunction with an excavator to ensure the ditch is absolutely level. The speaker further explains that a slight curve is intentionally introduced to the trenches to increase their overall length, which is beneficial for the drain field's capacity and efficiency.

Goal: Achieve perfectly level trenches and maximize run length for the drain field.