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Re: Excavating close to a building

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This is a good idea. You can use a 1/2 sack mix and can use soil from the
excavation if it is sandy. About 20 yrs. ago on a storm drain job, the
contractor rented an old ready mix truck and had it on site throughout
the project to do this.

Stan Scholl, P.E.
Laguna Beach, CA

On Fri, 21 Dec 2001 10:31:12 -0700 Daryl Richardson
<h.d.richardson(--nospam--at)shaw.ca> writes:
> Michael,
> 
> 	There is one thing you could consider: there is a product 
> which I have
> heard of under a variety of names; these include "flowable fill" and
> "non compressible fill".  The material is, in fact, 500 p.s.i. to 
> 800
> p.s.i. concrete.  The material is removable with excavation 
> equipment if
> required; and, for some installations, it is actually less expensive
> than placing and compacting regular fill.
> 
> 	You might be able to convince them to use this, particularly 
> if you are
> willing to share the cost.
> 
> 				Best regards,
> 
> 				H. Daryl Richardson
> 
> RISSELL, MICHAEL E [Non-Pharmacia/1000] wrote:
> > 
> > My home town in west central Missouri is installing new sewers.  
> My dad has
> > a 30 year old pre-engineered metal building, 45'x60', slab on 
> grade with
> > footings 3' below grade, I think.  The city wants to run a new 22" 
> HDPE
> > sewer along the 60' side of the building, 6' from the edge of the 
> building,
> > 10' deep.  The building is still in excellent shape and there has 
> never been
> > any problems with settling, concrete cracking, etc.  Their 
> construction plan
> > is to use trench boxes at the joints and then backfill in 2' to 3' 
> lifts and
> > compact to 95% Proctor.  I indicated a big concern with 
> undermining of the
> > foundation and thought sheet piling was the only sure way to keep 
> the
> > integrity of the foundation and surrounding soil intact.  
> Obviously the city
> > does not want to go to that expense and stands behind the contract 
> with
> > their contractor that says he is bonded and insured.  Their 
> engineer also
> > pointed to a similar installation they performed 2 years ago 
> adjacent to a
> > house, with no problems resulting.  As most of the houses in this 
> area have
> > basements, I think we have an apples and oranges comparison.  No 
> soils
> > reports exist for this area and the city also doesn't want that 
> expense.  My
> > concern also is that even if this gets installed with no problems 
> at the
> > time, settling could occur 2, 3, or 5 years down the road and it 
> would be
> > hard/impossible to get any relief at that time, with legal 
> proceedings
> > almost surely required.  Prevention is much better than a cure 
> anytime!
> > Anyone have any thoughts on ways to convince them to do this the 
> right way?
> > Or am I being overly conservative?
> > 
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