When evaluating any onsite system, always start by collecting any records of the system (plan, soil test, etc.) from the local regulating agency. This aids in making your report more accurate. Include whatever documents you find with your final report to your customer.
There are those who will run water into the system as a step in the system evaluation, but I caution not to do so. The most important reason is there is already a court precedent saying that the act of running water into the system caused the failure. The regulatory agency that required water be run into the system lost
