Brett,
I played Riv a few weeks ago, were the trees between the two fairways taken out on #8 when you played? They are now, and have been for a few years, so you might have seen it with or without trees, the sandy watercourse was there before they removed all the trees in the middle of the hole.
That being said, they do not have rakes , it is not maintained and I would guess that they do add sand to keep the look "sandy " as opposed to letting the dirt mix too much with the area. I usually play there every month, so I will try to remember to take a photo for you.