What is required for a sump used to discharge a building subdrain?

A sump used to discharge a building subdrain is required to be vented and have a removable gastight lid to ensure proper ventilation and to prevent the buildup of potentially harmful gases. Venting helps to equalize pressure within the sump and allows for the release of any gases that may form as a result of decomposition or other chemical processes within the water collected in the sump. Additionally, a gastight lid is essential for safety, as it prevents the escape of any hazardous vapors into the surrounding area and minimizes the risk of contaminants entering the sump.

In contrast, while a specific depth, cover material, or diameter might be relevant for different types of sumps, these factors do not address the critical safety concerns associated with ventilation and gas containment. Additionally, a depth of 30 inches or a minimum diameter of 12 inches may be practical dimensions but do not encompass the necessary safety features that a sump should have in order to function effectively and safely in discharging building subdrains.