My buddy had a sewer line replaced recently. Plumber came out and did all the work. Somehow a few days later, guy's water line broke due to something in plumber's work. So plumber came and replaced water line to the meter. We had some heavy rain last night, which is the first rain since the work had been done. He sent me this pic today showing part of the ditch appears to be settling. He's concerned because it started doing very similar prior to the water line breaking. Is his plumber going to be replacing a water line again, or will he be good just adding more topsoil?