What happens if a perc test hole has been open to the atmosphere for more than three consecutive days?

If a perc test hole has been open to the atmosphere for more than three consecutive days, it is considered automatically invalidated. This is because prolonged exposure to the atmosphere can lead to changes in soil moisture levels and conditions that can significantly affect the perc rate measurements. The test results may no longer accurately represent the soil's natural drainage properties if evaporation or saturation changes have occurred due to environmental exposure. Therefore, adhering to strict conditions for conducting a perc test is critical to ensure its reliability and validity, which is why the option stating automatic invalidation is correct.