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  • Users: dBasement
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  1. dBasement

    I need help sourcing a piece of air-handling equipment for a sewage treatment system

    I need some kind of air valve. I need the valve to cycle through 10 different outlets from one inlet that comes from a conventional air compressor. So, it would work with air like a hydrotech valve works for water. The project is a sewage treatment plant handling flows of about 10k gpd. My...
  2. dBasement

    Waterline freezing protection

    We are to install new manholes over an existing waterline that presently has sufficient soil frost-depth. The manhole will be vented to air that can reach -30c. Since we are now losing the insulating value of the soil cover by installing the manhole, do we now need to be concerned about...
  3. dBasement

    Determining sand density at depth in a borehole

    Does anyone have a methodology for determining the density of non-cohesive sand at a depth up to 50m? There will be groundwater. I am considering either a hollow stem auger or sonic drilling apparatus and drilling to just above the test zone. I would then need to either use a clamshell or...
  4. dBasement

    Sonic Rig Question

    Sorry, for the cross-threaded post from mining engineering, but it is more geotechnical than mining. We are using a sonic rig to look at overburden in a very dense / hard fine-grained deposit that I believe to be weathered bedrock. The problem is, we are getting SPT results just below the...
  5. dBasement

    Sonic Rig Vibration

    We are using a sonic rig to look at overburden in a very dense / hard fine-grained deposit that I believe to be weathered bedrock. The problem is, we are getting SPT results just below the casing that show blow counts of 30 or 40. In the meantime, the driller says its hard as nails and we are...
  6. dBasement

    Conversion of Proctor Data from French Test Method

    I have proctor data from a French Test Method (NF P 94-093). I am hoping someone can tell me how that test procedure differs from ASTM D698 Proctor (if at all)
  7. dBasement

    Subexcavation in frozen soil near existing foundations

    Background: I am an independent third-party consultant being asked to supervise an excavation and fill operation in frozen soils. Scenario: Over-wet (significantly above optimum), clay-rich soils were used as backfill around a number of exposed foundations on an oilfield site in a northern...
  8. dBasement

    Sand Equivalent vs Hydrometer

    I need a "quick and dirty" method to determine clay content in soils. Can the sand equivalent test give me a percentage clay content? Or do I stick with a hydrometer test? When doing the hydrometer. I have tried cutting back the number of readings so I just end up around the 2 micron and...

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