Depth of testing within a project area is dependent upon the depth of potential archaeological resources and the potential vertical project effects. Testing should extend through to the maximum depth where any potential pre-contact archaeological remains may be found and below the depth of potential project impacts. In general, upland soils where sediments are slow to accumulate are shallower than soils found along creeks, streams, or rivers (alluvial soils) where flooding regularly deposits new sediments over the land surface. Only an assessment by a qualified archaeologist or geomorphologist can confirm the depth for testing within a specific project area. CDC employs a staff geomorphologist to aid our clients in identifying depth of testing within their project areas.