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.