The invention relates to a device for determining the position and direction of channel inlets and channel outlets in wastewater systems that, in the horizontal plane, lead into and out of sewer manholes. The second chip includes a logic device selected from the group consisting essentially of a reset transistor, a selector, a row selector, and combinations thereof therein. Updates to a cached data element can be effected if an integrity assessment determines that recordation of an updated version of the data element preserves operational integrity of one or more network components or services. Dummy spacers are formed along dummy gate sidewalls and over a portion of the source-drain extensions.