I love night dives, and even enjoy them in the local quarry. But I would offer you some cautions depending on the dive plan.
- Typical guidance is to do a night dive on a location your were familiar with during the day. You have dived this quarry before, but I assume it is large enough that you may not have done THIS dive before. It would be a lot better if you get there and do that same dive in the afternoon, and then follow up in the same spot at night. Especially as a new diver, doing your first night dive.
- You also say the quarry bottom is about 80 feet. Is that the plan? Or are you diving a shallower area, or following the quarry walls? 80 feet at night is a bit questionable in the first place, plus a new diver, etc....
- Visibility in your quarry? The more challenging that is, the more you should think about my first two points.