Some History:
Located on approximately 265 acres of land above Pearl City residential neighborhoods, Waimano Ridge was home to the Waimano Training School and Hospital (WTSH), an institutional incarceration facility for people with developmental disabilities. Established in 1919, the hospital, which was originally known as the Waimano Home for the Feebleminded, was shuttered in 1999 following years of rumors about dingy conditions and questionable patient treatment.
Today, Waimano Ridge is a medical facility in transition. It currently hosts a number of state organizations and programs: The old Waimano Training School and Hospital was renovated and is being used by the Department of Public Safety. Other buildings house Department of Health (DOH) offices, the DOH Laboratory facility, Mental Health Transformation State Incentive Grant offices and a juvenile sex offender program.
Not much is known about the "Forgotten" except that they were once patients.
Now For The Cache:
Out of respect for the "Forgotten", the cache is not where they are, but it is nearby, a safe distance away.
Once again, the cache can only be found using certain equipment. Make sure you have the most recent software version installed. If you do not agree with the use of this equipment and prefer not to find it, feel free to put the cache on your ignore list to remove it from your map. If you complete this cache, please do not give out final information.
To reach the final, take any device that is capable of receiving "mysterious messages from the spirit world" or in other words... a "chirp". I have a unit that can be borrowed if you would like to seek this cache and don't own one. Just email me and we will set up a time to have some fun.
Go to the coordinates listed above and WAIT for the friendly spirits to guide you.
FTF Prize: 
GeoGerms Geocoin ----> Congrats Jinx53!
Disclaimer: You are under no obligation to hunt my cache. You do so at your own risk. Like any outdoor sport, it carries the risk of unforeseen hazards. Use your best judgment with the environment and conditions. As conditions and cache locations may vary, it is the responsibility of the searcher to be familiar with the conditions in the area to be searched, to adequately prepare for those conditions, and to conduct oneself safely and responsibly and remain within his or her personal abilities and limitations. Children should be well supervised. When and if you find a cache, you are under no obligation to touch it, reach it, climb to it, dig for it, pick it up, or even open it. Open it at your own risk. If food or drink is present, do not consume it, throw it out. Individual Geostash and GPS cache sponsors assume no liability for events, which may occur, related directly or indirectly to your searching for a stash.