I spent 36 years being a well drilling and pump installation contractor. One thing to consider is, are there state regulations dictating construction standards? Our state have very stringent standards. Mart has a firm grasp on contaminated wells. For every well there is a septic system to add once used water to shallow water tables. Even if your septic is at a safe distance, is your neighbors close to your well? I have never seen a well where concrete casing is used. I do not care for surface pumps. They work fine but I much preferred submersibles. The drain rock is known as a filter pack and is used to hold back fine sands from entering the pipe perforations. That gets me to thinking, with concrete pipe, how was it perforated? I would assume the contractor has been at his profession for a few years and has a firm grasp on well construction in his area.
