__________________ is the minimum trap seal on a Type I interceptor?

The minimum trap seal on a Type I interceptor is 8 inches. This requirement is established to ensure that the interceptor effectively retains solids and grease while allowing wastewater to flow through. A deeper trap seal helps prevent odors from escaping into the building and ensures that the interceptor functions properly by maintaining sufficient water in the trap. This depth is critical to ensure that the interceptor can operate effectively in a commercial setting, where significant volumes of wastewater are processed.

A trap seal of 8 inches provides a balance between adequate retention of potential contaminants and the ability to facilitate necessary drainage. This depth is aligned with the standards required to ensure the proper operation of Type I interceptors, which are commonly installed in settings such as restaurants and kitchens that generate grease-laden effluent. Thus, an 8-inch trap seal is essential for both health and environmental safety, aligning with plumbing codes and best practices.