The survey that establishes a COH88 value or values shall meet all of the following requirements:
(a)
The survey shall be referenced to and shall have field-observed statistically independent connections to one or more orthometric height reference stations that is or are one of the following:
(1)
CSRN station.
(2)
Geodetic control station located outside of the State of California that meets all the requirements for inclusion in the CSRN except that the station is outside California.
(3)
Existing COH88 station that (A) is shown on a map filed with the applicable county surveyor by a public officer, subdivision map, corner record, or record of survey, (B) meets all the requirements for inclusion in the CSRN, except that the station and its data are not published by NGS or CSRC, and (C) has an accuracy, conforming to the applicable CSRN requirements, stated for the station’s value.
(4)
Existing COH88 station that is shown on a public map or document that (A) is compiled and maintained by the applicable county surveyor, (B) meets all the requirements for inclusion in the CSRN except that the station and its data are not published by NGS or CSRC, and (C) has an accuracy, conforming to the applicable CSRN requirements, stated for the station’s value.
(b)
If an accuracy is to be claimed for the COH88 value or values established, the claimed accuracy shall be an accuracy standard published by FGDC or FGCS.