If you want to test the effectiveness, buy another domain and put that on the side.  

Manage your property effectively, be especially careful in the area of safety, use common sense, and have a lot of liability insurance.

By disclosed, I mean have her sign something to the effect.  

This is for a property in Pennsylvania.Another need would be an attorney who has boiler plate agreements I can engage.

The following was found in a google search:When septic systems are properly designed, constructed, and maintained, they effectively reduce or eliminate most human health or environmental threats posed by pollutants in household wastewater.

Lastly, I don't want to engage "cousin", as I'm told she can be quite malicious.

I'm struggling in finding resources on how to effectively and accurately calculate the value of property as well as AVR.

The latter option would save you the out of pocket expense while effectively financing the cost over the period of the loan.  

Yes I have a contract …yes I could sue for non performance, I could probably notify a title company about it …not sure I would win unless I am prepared to spend a lot for an attorney and engage in complicated litigation.

IMO, it takes a certain personality type to be effective as a property manager on a larger scale.