If the float that triggers the lead pump in a wastewater lift station is positioned above a gravity influent line, what might occur?

When the float that triggers the lead pump in a wastewater lift station is positioned above a gravity influent line, it can lead to issues related to flow management and potential stagnation. Specifically, having the float positioned this way often means that the influent is not properly moving into the wet well of the lift station when water levels are low. This can create conditions that allow grease and other solids in the wastewater to settle and build up in the line, as there may not be sufficient water flow to carry these materials away. Over time, this accumulation can lead to blockages, which can result in a grease problem due to the trapping of lighter materials.

As for the other selections, having a higher dissolved oxygen level would typically require adequate mixing and aeration in the system, which might not occur if the wastewater is stagnating. Similarly, if the float is positioned inappropriately, it could negatively impact the efficiency of the system by not initiating the pumping cycle at the right time, leading to inefficient operation, and the potential for blockages in the line would contradict the idea of remaining clear of obstructions. Thus, the position of the float has a direct relationship with the potential buildup of grease in the influent line, supporting the correctness of the answer