A septic system contractor friend told me about his experience installing an uncomplicated, standard gravity system in a county in Oregon. The installation went well, and when finished he called in for the pre-cover inspection. Upon inspection, the regulator informed him that the distance between two of the drainfield lines, in two points, had only 7 1/2 feet of undisturbed soil between them rather than the 8 feet required by the Department of Environmental Quality rules. The four drainfield lines installed had an overall 30-foot width between the outside lines, centerline to centerline, meeting code, but those two pesky short
