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Yes, everything that remains will be thoroughly cleaned before backfilling. We went with filling the smaller pits and trench drains with lean concrete, and for the larger pits, putting in an approx. 6" diameter hole about every 20 sf. That should give them a pretty reasonable cost estimate...

We're just trying to come up with a preliminary cost estimate. The design will come later (hopefully soon!).

I am working on a project which is an old manufacturing facility that is being dismantled, with everything being brought down to grade. The facility contains many u-drains and pits, which will remain in place, and will be backfilled. The contractor is planning to put holes in the bottom of the...

Interesting question. I'm working on a similar project here in Georgia--extending a gravel parking lot for trucks. In general the existing slope is 4-5 percent, but in one area it is 2.5 percent, and that's where they're having problems with ponding and drainage. Seems that 4-5 percent might...