The contractor returned Ray's call a few minutes after nine. Dana Whitfield had been repairing farm drainage systems across central Iowa for nearly twenty years, working from a small yard two counties over with a crew that knew more about buried water than most farmers knew about the weather overhead. Ray sent her the map, the photographs, and a short account of the three breakdowns. She listened without interrupting, then said something that made Tom understand she was taking the matter seriously. "Keep everybody off the line. I'll rearrange the afternoon."
Dana arrived before noon with a compact excavator on a trailer, a service truck, camera inspection equipment, and one crew member named Luis Ortega. She was in her early forties, with short dark hair pulled away from her face and hands marked by the kind of work that refuses to remain clean. Nothing about her suggested that she intended to impress them. She parked beyond the field entrance, checked the map, and asked them to show her the edge of the suspect area without walking across it. Then she took her own photographs and began asking questions Tom had never imagined needed asking.
How long had the outlet been visible above the creek in the spring? Had the waterline changed after bank erosion? Did the system ever back up into the headland? Were there places where plants grew too well, or weeds appeared out of season? Tom could answer some questions immediately and others only after thinking hard about several years of harvests. Dana wrote down the answers without suggesting that failing to notice a detail was a moral offense.
She stopped by the old fence post and studied the line of orange flags. "Your father mapped this by sight?" she asked.
"As far as I know."
"Pretty good sight." Dana turned the map and compared it with the fall of the land. "These old clay mains were often installed to follow the easiest grade available, not the neatest line for future equipment. If the outlet is blocked, the water can look for another route. We need to understand the pipe before we touch the soft section."
She asked Tom to explain the failures in order. He described the old axle, the blown tire, and the rental driveline, including what Ray had learned from the inspection reports. Dana nodded but kept her conclusions careful. She said a buried cavity could account for sudden changes in support beneath heavy wheels, but she wanted evidence before accepting that explanation. It might be a collapsed pipe, an old trench that had not been compacted properly, or more than one problem connected by water.
They began near the creek, where the old tile main emptied through a weathered outlet partly hidden by grass, roots, and silt. Tom had passed that place hundreds of times and rarely looked directly at it. In wet seasons he noticed water in the ditch, then moved on to a fence repair or a fallen branch. The outlet was not dramatic. It was simply a dark opening in the bank, easy to overlook precisely because it had been there longer than he had.