At least 24 hours after the tank has been filled to the maximum test height. This 24-hour period may be
increased to duration specified on the data sheet if the Purchaser so requires for conditions such as:
i. The tank is the first one in the area,
ii. The tank has a larger capacity than any other existing tank in the area,
iii. The tank has a higher unit bearing load than any other existing tank in the area,
iv. There is a question regarding the rate or magnitude of settlement that will take place;