Most of those posted online (goggle "apiary rules") tend to launch straight into rules, hygiene, record keeping, knocking out smokers or whatever.
I'd start with a basic statement that the aim is to be a good neighbour, to other beekeepers on site or in the area, the public and the site owner.
Next up is some basic structure to the management, an apiary manager elected or appointed by the BKA committee to oversee day to day and resolve disputes. Final decisions rest with the manager or referred to the committee? If you want training hives, somebody has to make decisions, delegate tasks and supervise the management of those hives, maybe a separate training officer.
Then anything you want to agree under basic headings:
- Access rules to the site, keys, times, no unsupervised beginners or similar.
- Hygiene rules, equipment, material brought onto site, disease treatment etc. Compliance with all the statutory rules, disease standstills etc. Maybe include that NBU or RBI recommendations are target management standard.
- If members own hives are there, then who qualifies, full member only, limited numbers, what can be left on site, stands, spacing, temporary nuc boxes, waiting lists. Either check insurance limits or agree to bear losses as they arise.
- Responsibilities for members hives re disease control and swarm prevention. deposit of contact details in each hive or with apiary manager.
- Communication expected each way from manager and hive owners
- Contributions to maintenance or annual fees to cover expenditure?
- Swarms, known, unknown or disputed origin.
- Abandoned hives, what qualifies, duty of manager to deal with concerns raised, inspections and treatments, authorising interventions.
And any other broad topics you want understood from the beginning. The sort of scenarios you may have to cope with are members who don't have the time to fully manage a hive, delegated care because of illness or work commitments etc that turn permanent, late membership fees or resignations. There are many others in addition to the basic disease and swarm problems.
There are plenty of shared apiaries that run with nothing more than a handshake, which is fine as long as all the original participants remain friendly and active. The problems tend to come when more are involved and others take over hives without clear ground rules.