People seem to appreciate my take on these things and may appreciate some variety among the NKLAQ and S&P posts, so here goes;
There's a few factors working against a site like this when it comes to precipitation;
- The equipment is actively grading the site with what appears to be zero positive drainage (i.e no rainwater will run off the site as it would with say a roadway, ditch or anything else that isn't designed to be perfectly flat) As a factory floor needs to be perfectly flat, and is eventually enclosed, so it's a gamble with the weather to construct these types of projects. It also does not make sense to grade it for positive drainage as you will eventually have to level it properly for the eventual concrete slab.
- As a side note, my current project in Vancouver utilizes near 100% dredged river sand that works beautifully against this sort of thing as it is a free draining material (rain goes right through, and wheeled equipment can drive on it rain or shine) but that is largely a function of local material availability.
- The material the large earth-moving equipment (Scrapers, bulldozer and, articulated haul trucks) are handling appears to have a very small grain size, likely a silt or clay like material, which is notoriously poor in terms of a running surface when saturated with water. It's great to move when it is dry or near optimum moisture*, but for reasons associated with the point above, it really just makes sense to wait it out. The problem is that wheels/tracks will simply pick up the material and ruin the already accomplished efforts and create twice the work to restore what they have done.
- You can use additives like lime to dry the material, and gravel/aggregate can provide a running surface, but those are both very costly as a function of their proximity to the site. Cubic dollars can solve this, but it's usually only done for small areas and if something is schedule critical. You could use a grader to "peel" off the top layer of saturated material, but you will then have to do something with that material in terms of hauling it away, which is costly and wasteful. Again, waiting things out is really the best option here.
The good news is that there is some work happening! The pile -driving-looking rigs are in fact not pile drivers, but Excavators with a special attachment for something called "Stone Columns". These machines are uses to effectively inject aggregate into the lower soil strata to provide a more competent sub-grade in terms of bearing capacity, normally through vibratory means, although soil mixing variations through mechanical means exist as well. It means there won't be any piles, at least for part of the site. It's a pretty common technique for areas with poor ground conditions and does provide resistance of sorts against liquefaction during a seismic event. Not sure that's the intent here, probably more for the bearing capacity, the technique itself is referred to as "ground densification" and does exactly what the name implies - makes things denser so they can support more weight. Dense = good.
You can see the telehandlers loading aggregate from nearby piles into the feed bins located a ways down on the attachment arm. That's what all the aggregate is for. This type of work is unimpaired by rainfall events.
*In case you noticed the water truck watering the material on drier days, what's going on here?! Too wet today, too dry yesterday? In essence, yes. There's an optimum moisture content for fine grained materials that hugely impacts their work-ability as it concerns heavy civil projects like this;
Atterberg limits - Wikipedia
My references (again): Same toys, different Sandbox.
More relevant: I cancelled that sell order I had earlier this week and bought more the very next day