Hello dear community,
I hope I am posting in the right subforum for my question.
We have conducted a soil survey and are currently requesting quotes for the upcoming earthworks.
I am quite uncertain about the required removal of topsoil and the possible need for drainage work. I would be very grateful for your interpretation or explanation. I am posting the relevant excerpts from the soil report here.
The first quote from a civil engineer states:
"Sand slab for a single-family house without a basement, 11x11m (36x36 feet), 120 m2 (1,292 sq ft) excavate soil to a depth of 1 m (3 ft) Remove approximately 150 m3 (196 yd³) of soil and dispose of it Deliver, install, and compact approximately 150 m3 (196 yd³) F1 sand in layers Fine grading ± 2 cm (1 inch) and plate load test Excavate for foundations" = 10,000€
Is this appropriate, or is something missing (drainage?), or is there anything excessive?
I hope I am posting in the right subforum for my question.
We have conducted a soil survey and are currently requesting quotes for the upcoming earthworks.
I am quite uncertain about the required removal of topsoil and the possible need for drainage work. I would be very grateful for your interpretation or explanation. I am posting the relevant excerpts from the soil report here.
The first quote from a civil engineer states:
"Sand slab for a single-family house without a basement, 11x11m (36x36 feet), 120 m2 (1,292 sq ft) excavate soil to a depth of 1 m (3 ft) Remove approximately 150 m3 (196 yd³) of soil and dispose of it Deliver, install, and compact approximately 150 m3 (196 yd³) F1 sand in layers Fine grading ± 2 cm (1 inch) and plate load test Excavate for foundations" = 10,000€
Is this appropriate, or is something missing (drainage?), or is there anything excessive?
W
WilderSueden15 Jan 2024 13:55Schnubbihh schrieb:
We don’t have a rainwater sewer here; we need to infiltrate water on the property.In that case, I would lean toward an option without drainage. This way, you can’t rely on the drainage working when it really matters. Besides, with drainage systems, you have the problem that they need to be regularly flushed to function properly. You might do that at first, but probably not after 10 years.
Schnubbihh schrieb:
Are you aware that these are two different alternative options from a single provider?
Also, I have roughly summarized the items from the offer here for better readability.
So I don’t quite understand how you come to your conclusions... It’s simple: it was not clear to me that (1) and (2) are variants from the same bidder rather than offers from two different bidders.
However, it remains true that among the proposed approaches, only one can be the “more correct” and, above all, only one can comply with the tender specifications.
You have the expert report and have discussed it here. From that, a specialized planner should be able to clearly determine which measures are appropriate or required. If both offers were equivalent (in which case the planner should have tendered both variants, not the bidder submitted two answers to one question), then it must be the case that the reason for the drainage is also buried in the depth layer “60 to 150 cm (24 to 59 inches) below the finished ground level.” Is that the case (yes or no; I wouldn’t want to build based on “maybe” in the literal sense)?
By the way, a proper tender should include clear quantity specifications as well as corresponding unit prices for additional quantities in the offer. Even the centimeters (cm) are unsuitable here, since the ground surface is not level, but the result must be.
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