July 16, 2025, Planning Board Special Meeting Transcript - WEHI

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 22 material that can be counted you basically have what's called 50 percent RQD. Now, 100 percent RQD for example, you got a piece of solid rock that was -- basically there was 100 percent recovery, meaning when they did the corer they were able to, of the five feet, they were able to take the five feet out and there was almost no breaks in the rock. So basically a solid piece of rock. As you get lower and lower the quality goes down, meaning the rock is more fractured, more weathered and so for example one of the borings that they had found they actually got what's called a zero percent rock quality. Zero percent means they couldn't find enough of a length of the material of corer rock to actually utilize in that calculation. Meaning it was highly fractured piece of rock. Now, that RQD is very important because what it does is it goes into what's called the Geological Strength Index and -- or the GSI, and that is input into the model, the slope stability model. Okay. So we're going to talk a little bit more about that in a few minutes, but I wanted to kind of go through the order of the report that I prepared. One of the things that I looked at is obviously you're trying to keep the building, when you're developing near a rock face or a rock slope or any kind of steep slope area, is trying to keep the building as