Large Site Mechanical Pad - Rural Grassland - 3/4" crushed or Roadway Type Subbase
Large Site Mechanical Pad - Rural Grassland - 3/4" crushed or Roadway Type Subbase
(OP)
Having an issue with a client who 'has always used 3/4 crushed aggregate below his mechanical pads without a problem'. Current site within flood plain, has high water table and little to no drainage plan on site. I am recommending a mixed aggregate and clayey graded 'roadway' type (Class 2 AB) subbase material that in hopes it will act less like a reservoir below the mechanical pad during wet weather than a pourous 3/4" . Am I being 'too conservative',....again! Thinking about this one too much? Any thoughts? Thanks in advance, Bill





RE: Large Site Mechanical Pad - Rural Grassland - 3/4" crushed or Roadway Type Subbase
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RE: Large Site Mechanical Pad - Rural Grassland - 3/4" crushed or Roadway Type Subbase
RE: Large Site Mechanical Pad - Rural Grassland - 3/4" crushed or Roadway Type Subbase
I tend to agree with you. I would like the immediate area to drain away from the pad. Thus, a bit of attention to pad elevation and finished grading is needed. And, I have never liked the idea that the pad base excavation might act like a sump or bath tub under the pad, particularly so in cold climates. If you don’t have to worry about freezing, and the water table is near grade anyway, the whole area is a sump, so what have you gained? One advantage of the crushed rock, maybe with some geo-textile surrounding it, and with a high ground water table is, that your base material with a fair amount of fines, could be subject to some pumping at the edge of the pad. Make a list of your pros and cons of the two base material system, and let the contractor pick and respond to any issues you might have. Then record his selection in a letter, one for him and one for the file.
RE: Large Site Mechanical Pad - Rural Grassland - 3/4" crushed or Roadway Type Subbase
RE: Large Site Mechanical Pad - Rural Grassland - 3/4" crushed or Roadway Type Subbase
RE: Large Site Mechanical Pad - Rural Grassland - 3/4" crushed or Roadway Type Subbase