A builder’s level & reference hubs will be used to provide a uniform trench bottom elevation of 93.50′. During excavation, a rod reading of 5.12′ is taken on a nearby hub. This elevation is 102.2′. The builder’s level should read_____ if the trench is at grade.

A builder’s level & reference hubs will be used to provide a uniform trench bottom elevation of 93.50′. During excavation, a rod reading of 5.12′ is taken on a nearby hub. This elevation is 102.2′. The builder’s level should read_____ if the trench is at grade.