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 21 through the topsoils that are there using what's called a split spoon sampler and that's hammered down into the ground with standard using AST standards to basically drive a spoon to collect soil samples. Once you get down to the point of bedrock you then switch over to what's called a corer, a rock corer. And the corer is, basically it's a diamond cutting edge to it, an industrial diamond edge to it and they core through five foot segments through bedrock to collect the samples so that they can then open up the samples on-site and look and characterize the rock. One of the big things we're going to talk about in regard to the adequacy of this slope, is what's called rock quality designation. Rock quality designation, I explain it in the report that I have. Rock quality designation is a method to determine the competency of rock. What you do is you, once you retrieve a sample you look at all the samples that are greater than hundred millimeters and then you basically count those up and add them up and divide that by the total length of the core. So for example, if the ones you can measure that are greater than that, that width or thickness, so to speak, that length of core, you then add the length of all those up. So if you're only finding 50 percent of the core has the length of