A wetlands delineation is used to determine the jurisdictional boundaries of the responsible agencies (previously identified as the CCC, the Corps, and CDFG). When making wetland determinations, three general characteristics are sought: vegetation, soil and/or hydrology.
The CCC's regulations (California Code of Regulations, Title 14) establish a "one parameter definition" that only require the evidence of a single parameter (vegetation, soil OR hydrology) to establish wetlands conditions.
In contrast, the Corps generally use a "three parameter definition" requiring the evidence of all three parameters (vegetaion, soil AND hydrology) to establish wetlands conditions, as discussed in the Army Corps of Engineers Wetlands Delineation Manual.
As such, it is feasible that an area of land is considered to be wetlands under the CCC definition, but not under the Corps definition.