December 3, 2025 Regular Meeting - WEHI Transcript

01/05/2026 02:58:16 PM Page 29 to 32 of 68 8 of 17 sheets 29 to range from a few feet to many feet far from the1 mapped faults but become closely spaced near the2 faults." Now, what is the reference and relevance of3 that to this project?4 That's the, that's the, we have a surveyors5 A. reference in there, it's the bedrock geology of the6 Caldwell Quadrangle Map and I think that statement comes7 from the map.8 And also refers to the Second Watchung ridge,9 Q. right?10 Right.11 A. So these faults are present in this ridge, is12 Q. that correct?13 No, the maps, there's one fault shown, it's about14 A. 2000 feet from the site, it was referenced by Langan in15 their report. It's in their report. The location is in16 the report. It's about 2000 feet away. Half a mile.17 Then you go onto say, "Tectonic joining is18 Q. reported to range from a few feet to many feet far from19 the mapped faults." So what is many feet, how far from20 the mapped faults do we see the tectonic jointing?21 I'm sorry. Are you talking about the spacing of22 A. the joints?23 I just read what you wrote. You said, you know,24 Q. there is a fault line about 2000 feet from the site.25 30 And then you say, "Tectonic jointing is reported to1 range from a few feet to many feet from the mapped2 faults but becomes closely spaced near the faults." So3 I am saying, how far is many feet?4 Well, many feet could be 5 or 10-feet.5 A. It could be a 1000 feet or 2000 feet?6 Q. It would be good if it was as much as a 10007 A. feet.8 Why?9 Q. The further spacing the better, because then10 A. there's more intact solid rock.11 So we don't really know at this point from this12 Q. reference whether it's better or worse, this condition?13 Right. But they identified joints, the spacing14 A. is there and there's joint spacing indicated on the test15 borings and there is a whole discussion of that in the16 back and forth between Langan and Princeton Hydro.17 Now, you also mentioned, you also mentioned, you18 Q. say at Page 15, this is referring to the site itself,19 "The rock formation, however, has a variable secondary20 permeability which is created by the complex network of21 intersecting fractures. Depending on the width of the22 fractures, the filling and surface roughness cracks23 surcharged by water levels high up on the slope can24 develop localized high hydrostatic pressures which could25 31 affect the local

idth of the22 fractures, the filling and surface roughness cracks23 surcharged by water levels high up on the slope can24 develop localized high hydrostatic pressures which could25 31 affect the local stability of the soil overburden."1 Now, what is this complex network of intersecting2 fractures and where is it on the site?3 The whole rock formation is cracked. So it's all4 A. over.5 So everywhere are on this site where they want to6 Q. put this building the rock formations cracked?7 Everywhere they're building in the Metropolitan8 A. area they have rock cracks.9 Well, most buildings aren't built on the ridge10 Q. line that rock collapses?11 Some.12 A. But some are.13 Q. Now, this building is on a network of14 intersecting fractures, is that correct?15 Right. And almost all buildings are.16 A. I heard you.17 Q. Now, what is the size of those fractures, is18 there any analyses done of that?19 We just defined them as very fine cracks roughly20 A. 2 inches apart and there are other cracks that were21 described from the Langan report.22 What other cracks and how wide?23 Q. I didn't get a direct width, but there are test24 A. borings that would have core samples in the Langan25 32 rebuttal report. There are rock core samples if you1 want me to take a look at that.2 Now, fair to say there are thousands of fractures3 Q. say where Building D would go?4 Right. And that's typical.5 A. I'm simply asking you, is it fair to say there6 Q. are many fractures where Building D will go?7 Right.8 A. Okay.9 Q. Now, when excavation is done, presumably the10 joints that exist inside the rock may be seen or will be11 seen?12 Correct.13 A. Now, who is responsible for filling those joints14 Q. to avoid this infiltration of water you spoke about last15 time?16 That would be part of the excavation work plan17 A. that we recommend having an engineer prepare as part of18 the requirement for the construction.19 And what would be in the excavation work plan20 Q. that would deal with this issue?21 It would be the -- it would be the treatment of22 A. cracks.23 In other words, the method of treating?24 Q. Right.25 A.