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 27 did not reflect basalt type of material. It reflected more of a like a less strength strong type of material like a sandstone or as they call it in our, if you go to the chart on the second -- on the third page. When you look, when you're looking at specimens for the strength of the material, if you have a basalt it's up about a 100 to 250 Megapascals. It's a very dense, strong material. However, the strength test that they provided actually came in with between this five and 25 Megapascals and it describes more of like a chalk, rocksalt, or potash. Now, do I believe that the rock is that weak or that, you know, such as that type of material. No. But it does show that in that location bedrock is significantly weathered from basalt's ultimate ability to resist the compressive strengths when they were doing the tests. So it's not quite as strong. Now, they did include the lower compressive test in their slope stability analysis. So one of the big things that it does affect is the factor -- is the, as I was talking about before, the geological strength index, which is another input parameter and when you do that, they ended up, and you use a higher strength material, the GSI is also a higher level of, a hire strength within the slope stability program. But what would