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<blockquote data-quote="kigmatzomat" data-source="post: 9052294" data-attributes="member: 9254"><p>That is a regional exception. (Not a small region) And, to be honest, most people eho had never seen it before would consider caliche rock more than soil. Honestly, the line between caliche and sandstone is a pretty fine hair to split. Give someone a block of both, a shovel and a hammer and ask them which is rock and I doubt many people would see a big difference. (Well, the sandstone is probably softer....)</p><p></p><p>The little water it gets activates the calcium carbonate in the sand, making essentially mortar. It's the raw material for Portland cement in some areas. Even when there are freezing temps, the water is chemically bound up, so doesn't turn into ice, so no frost heave. No organic matter to decay. Minimal insect activity.</p><p></p><p>Regular rain would actually dissolve it over a decade or five, which I guess is the deciding vote in "not exactly a rock" . I am not a geologist but if I were working in that area, my estimates would be using "excavation, rock" and not "excavation, dirt"</p><p></p><p>I am a retired engineer. Moving dirt was kind of my jam for two decades. I did cost estimates on Army Corps of Engineers projects and various regional utilities.</p></blockquote><p></p>
[QUOTE="kigmatzomat, post: 9052294, member: 9254"] That is a regional exception. (Not a small region) And, to be honest, most people eho had never seen it before would consider caliche rock more than soil. Honestly, the line between caliche and sandstone is a pretty fine hair to split. Give someone a block of both, a shovel and a hammer and ask them which is rock and I doubt many people would see a big difference. (Well, the sandstone is probably softer....) The little water it gets activates the calcium carbonate in the sand, making essentially mortar. It's the raw material for Portland cement in some areas. Even when there are freezing temps, the water is chemically bound up, so doesn't turn into ice, so no frost heave. No organic matter to decay. Minimal insect activity. Regular rain would actually dissolve it over a decade or five, which I guess is the deciding vote in "not exactly a rock" . I am not a geologist but if I were working in that area, my estimates would be using "excavation, rock" and not "excavation, dirt" I am a retired engineer. Moving dirt was kind of my jam for two decades. I did cost estimates on Army Corps of Engineers projects and various regional utilities. [/QUOTE]
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