Concrete sanitary manholes are filled with water and allowed to saturate and stabilize before testing. The rate of leakage for the manhole is based on water loss per gallon per hour per feet of diameter. What is the maximum allowable leakage for a sanitary manhole measured in gallons per hour per feet of diameter?

Concrete sanitary manholes are filled with water and allowed to saturate and stabilize before testing. The rate of leakage for the manhole is based on water loss per gallon per hour per feet of diameter. What is the maximum allowable leakage for a sanitary manhole measured in gallons per hour per feet of diameter?