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  1. Arizona3106

    Slab surface moisture issue in existing building

    @oldestguy - Thank you for your insights! @retired13 - Really appreciate the summary info on RH testing, visual survey, & damage mapping @Ron - Would appreciate any suggestions you have on RH testing, based on the previous ones you've done, and that we only have a 4in slab. Never used it...
  2. Arizona3106

    Slab surface moisture issue in existing building

    Foundation Plan may be useful (attached). I should mention, the subsurface water here is not your typical groundwater table. It's more of a thin, perched aquifer that may be for example, located in a porous bed 6 feet below grade, prior to excavation of 0 to 10 feet. As shown, top of...
  3. Arizona3106

    Slab surface moisture issue in existing building

    @Oldestguy - It is, and they said they had that checked. Subsurface water in the area tends to be relatively thin, perched on dense, cemented material, and also flowing within thin layers. My hypothesis was that the subsurface water was likely seeping from the cut made below the building...
  4. Arizona3106

    Slab surface moisture issue in existing building

    ¯\_(ツ)_/¯ Probably haven't checked either, since I don't think I know what tuckpointing or base seals are [wink]
  5. Arizona3106

    Slab surface moisture issue in existing building

    @Retired13 - Middle of the building is at least 10ft of cut... Chopped off a ridge. Fill in perimeter of three sides.
  6. Arizona3106

    Slab surface moisture issue in existing building

    Really good thoughts here. I understand it's really everywhere, not a central issue. Per Ron's questions The commercial building was constructed in 1986. Exterior french drains installed about 8 years ago Subsurface soils are typically medium dense to dense Clayey Sand with PI of 25-30 They...
  7. Arizona3106

    Slab surface moisture issue in existing building

    Moisture buildup between tile and concrete floor slab (Photo attached). Shallow water conditions are known to exist in the area. Perimeter french drain was installed over 4 feet deep, however, issue now noted in central portion of building. I believe it's due to head pressure after removal of...
  8. Arizona3106

    Becker Rig?

    We'll be looking at a site with up to approx 50' of granular, rocky fill material. I've never used one, but I'm thinking a Becker percussion rig would be best for exploring the fill material, what do you think? How are Becker blows usually recorded in the field? Can anyone recommend a...
  9. Arizona3106

    Wet, very loose sand

    OG - How did it work on the sites with shallow water?
  10. Arizona3106

    Wet, very loose sand

    Thanks for the suggestions - I had considered preloading the site, but I don't feel very comfortable that it would work for this case. I've had sites before with deep loose soils where we've run a large sheeps foot compactor on the surface for several days. Additional borings showed...
  11. Arizona3106

    Wet, very loose sand

    I guess the big question I have is determining allowable lateral soil pressures in this stuff - I feel like I'm working in soup. Any thoughts?
  12. Arizona3106

    Wet, very loose sand

    oops, I meant submerged unit weight, not saturated.....
  13. Arizona3106

    Wet, very loose sand

    I do like the idea of micropiles. However, I am a little lost as to what amount of lateral pressure can be relied upon for design. I understand that if phi is 0, at least the passive resistance resistance should probably be the saturated unit weight, so maybe an equivalent fluid pressure on the...
  14. Arizona3106

    Wet, very loose sand

    @BigH - Site plan is attached. Adjacent to the large rock outcrops, the wet loose soil is about 5 to 6 feet. The site is covered with native grasses. A couple cottonwood trees along the north side. @avscorreia: Yea, need to add some kind of cool water feature to this place. Would slender...
  15. Arizona3106

    Wet, very loose sand

    Sorry - By home site I mean just a higher end wood framed house.
  16. Arizona3106

    Wet, very loose sand

    I have a home site with rock on one side. On the other side is up to 23 feet of very loose, low plasticity, clayey sand, with water levels at about 4 feet. Just looking for other ideas for support, except for driven piles or conventional concrete piers. There is a little resistance in the...
  17. Arizona3106

    Soil Corrosivity to ductile iron pipe

    I guess that's what I was wondering - If the pipe is surrounded by shade material, does the native soil even need to be tested. The shade is tested yearly by the manufacturer. From your answer, it sounds like the surrounding native soil can also cause pipe corrosion and needs to be tested, not...
  18. Arizona3106

    Soil Corrosivity to ductile iron pipe

    We normally just use the AWWA 10 point scale for soil samples collected from test borings to help provide some guidance on polywrap requirements. However, pipes are always bedded and shaded with select material. Therefore, is it appropriate to test the native soils in the trench to determine...
  19. Arizona3106

    Lagoon Silty Sand

    I have a lagoon with silty sand side slopes. I have not visited the site yet, but pictures are attached. This is their 2nd slope failure, and they are seeking outside opinions. I am currently thinking about recommending a geocell product with gravel infill. My second thought is plating the...
  20. Arizona3106

    Other job opportunities for a geotech

    @oldestguy - I am amazed that you would take someone who is dissatisfied with their career, and tell them they should start their own firm. That is some really terrible career advice. The original question was "what other kinds of career opportunities are there in which a civil engineering...

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