While model policies and procedures are great, I’m always uncomfortable with templates and model agreements pertaining to an individual case since every situation is different. This is especially true for Last Chance Agreements, which vary depending on what precipitated the discipline–drugs, attendance, performance, etc. Anyway, here are a couple of decent things I was able to find.
http://astscorp.com/downloads/last_chance.pdf
https://www.templateroller.com/template/2075479/last-chance-agreement-template.html