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Foundation compaction
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I need to dig a hole for my foundation and fill/compact it with ??? for a foundation. The hole will be 40 by 100 and four foot deep.
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Well, first off, you don't need to dig a hole nearly that size, normally you would just dig a trench where you want the walls to go and pour a footing (depending on building size and soil conditions) 12" - 36" wide and then build walls on top of that.
For example, if you dug a 4' deep hole 48' x 108' (to allow for working space) you would have nearly 800 yards of fill, that would be enough to fill 80 standard dump trucks.
If however you only dug a 4' wide trench for a 40' x 100' (280 lineal feet) footing and wall, it would only generate about 40 yards of material, that would only fill about 4 dump trucks.
Do you have a need for 76 dump extra truck loads of dirt somewhere? 
After you pour the footing and perimeter wall, you just pour a floating slab right on top of the existing soil unless there is bad soil conditions.
Best of luck.
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Foundation compaction
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I need to dig a hole for my foundation and fill/compact it with ??? for a foundation. The hole will be 40 by 100 and four foot deep.
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[QUOTE=HighHopes;173912] My site is on a farm and the soil engineer has filed a report requiring me to remove the soil due to the organic material contained in it.
I am putting in a slab foundation and that may be the reason she is requiring me remove and replace the entire house footprint of 40x100 amd she says the organic material was found down to four feet.
I calculate 1,777 cu yds. I can dispose of the dirt on my property because I have 27 acres. What should I use to replace it to get compaction required for a foundation. [/QUOTE]
Well, as for the first & second paragraph, the engineer is (IMHO sort of) right, you can't support a building on organic material. However, she should also have told you that all you need to do is support the building on a narrow foundation that goes down past the organics to undisturbed soil, then make a floating slab floor that will sit on top of the organics just fine.
As for the third paragraph, you're math is a little off, a cubic yard is 3'x3'x3', or 27 cubic feet. So, 1,777 cu. yards multiplied by 27 is 47,979 cubic feet. If you divide that by 4,000 (40' x 100') you get 12'. I don't think you want a hole 12' deep. I think you missed one "dive by 3" in your equation, it should be 4' deep, not 3 times that or 12' deep.
As for the refilling question, you should be using a good, silt-free, subsoil, or 'B' granular, but I still say, unless you have a real need for soil somewhere, and a source of cheap (and I mean realllly cheap) fill, don't build this way, it will cost you a big bundle of cash mare than is required.
Best of luck.
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Foundation compaction
Ok, first off, your math is still wrong. If you need to dig down 4' to remove organics, then refill it with "engineered fill", fresh soil which has been compacted in layers (called lifts) of (based on your soil) generally 4" at a time, you will need a hole probably 10' bigger in both directions that the building, so 50' x 110' x 4' deep or 22,000 cubic feet. There is 27 cubic feet (3'x'3x3') in a cubic yard. So, 22,000 / 27 = 815 yards of material.
As long as the soil meets with approval of the Engineer who has to sign off on the job, i.e. free of silt, organics, etc., it doesn't matter where it comes from.
Best of luck.
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Foundation compaction
EW, I think you're forgetting about one little tidbit of critical information.
The OP "HighHopes" is located in Santa Cruz, CA., I doubt a few of your options would be allowed for seismic protection reasons, and if they were, it would add dramatically to the overall cost.
One of the reasons they like 'slab on grade' so much for seismic areas is that it makes the house sort of independent of the motion of the earth. It can sort of wiggle around on the surface, as opposed to being twisted when the above & below ground portions move at different rates and / or in different directions.
Best of luck.
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