An old, (35-40 year) sewage lagoon has "failed". It was built on clay till, (assumed, typical of the area) and affluent penetrated a dike, ran in a field and down a ditch intended for surface water. No geotechnical investigation is available, whether not done, being withheld, or just lost. The original design show how it was to be built, not the way it was. No testing data is available.
Who is responsible?
But we have no information. Piping or erosion, physical damage, muscats, gophers, water level, all unknown. Client is unwilling to pay for an investigation. So what should we do?