Secondary control stations shall meet . All secondary control points shall reference and adjust to nearby primary control points as directed by the TxDOT District Survey Coordinator.

These should be intervisible at a maximum of 1,500' distance apart, spaced evenly across the project area as much as possible, as shown in the . A control layout, provided in the , shall be provided to the TxDOT Survey Coordinator prior to control point monument construction.

Construction of secondary control monuments shall be done with the intent that they survive until the end of the project. Whenever possible, they shall be in TxDOT right of way and situated away from likely construction. Construction methods and materials shall match the diagrams and processes outlined in the listed in the for secondary control monuments.

All secondary control points shall be documented on Plans, Specifications, and Estimates documents and any ROW Mapsheets developed for the project.