The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Hawaii GPS Network - WAOP-Waokele P.S.
Start: 18-Dec-1999
End: 24-Aug-2007
Segall, Paul, Miklius, Asta, 2000, Hawaii GPS Network - WAOP-Waokele P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T52805P7