Here are the answers to O&M Quiz No. 5.1. T or F - A septic tank should be pumped if it is 37 percent full of sludge and scum.
Answer: True. The depth of the combined scum and sludge should be less than 25 percent of the operating depth of the septic tank. If the tank has a 60-inch operating depth, it should be pumped anytime the combined sludge and scum are 15 inches or more. This is to ensure excessive solids are not moving to the drainfield.2. T or F - A trash trap should be watertight and remove materials that
