If an accuracy is claimed for a COH88 value or values, the survey that established the value or values shall be documented on a map, record of survey, corner record, or other document that includes, at a minimum, the following:
(a)
For each COH88 station, the resultant COH88 value.
(b)
For each individual COH88 value, whether it is a leveled COH88 or a derived COH88 value.
(c)
For leveled COH88 values, the beginning and ending dates of the observations used to determine the values.
(d)
For derived COH88 values, the date of the NGS geoid model used to determine the values.
(e)
When derived COH88 values are shown and reflect the application of a “local orthometric height correction model,” written data that justifies the model’s validity. Such written data shall include a summary of the procedures, computations, analysis, and validation process used to develop the model.
(f)
For derived COH88 values, the epoch (date), in a decimal year format to two decimal places, that is the basis of the COH88 values shown. Said epoch shall be the published NGS or CSRC epoch of a controlling station for the survey.
(g)
The FGDC or FGCS accuracy standard of the COH88 value or values established. FGDC accuracies shall be identified as either a local or network accuracy.
(h)
Additional written data that justifies the FGDC or FGCS accuracy standard shown. Such additional written data shall include observation equipment, control diagram including required field-observed statistically independent connection or connections, adjustment methodology and software used, a summary of the procedures used or a reference to a published commonly accepted procedural specifications, final residuals or closures, and other data essential for others to evaluate the survey.