Secondly, the contractor has not underestimated here, he is not responsible for the building ground surveyor's recommendation. And first of all, a contractor only has to estimate if the client does not tender with properly determined quantities.Contractors often tend to estimate a smaller quantity in order to keep the bid price relatively low.
2) The geotechnical engineer then recommended excavating deeper and installing more material. HERE and nowhere else did additional costs arise – the contractor’s price in the billing exactly matches its amount in the offer. Accordingly, the contractor had to haul not 300, but 350 tons. Each time, he drove to the gravel pit with an empty truck. The truck is weighed upon entry and also upon exit. This does not happen on Baleks’ scale – instead, every year an official from the calibration office wearing a lab coat comes and checks whether the scale is still accurate. The weigh slips are like electronic receipts from emission tests, even showing the inspection number of the last calibration. Everything clean, everything traceable.
3) You don’t load 350 tons of payload onto the truck in one go. The construction workers on site measure after each installation and layer-wise compaction of the deliveries, and the driver was told to fill the eighteenth load only half full again.
The "experience" is reflected here in the two tons that are supposed to make up one cubic meter once installed, and "deviations" arise in connection with the sorting (in which mixture the grain sizes are present). Deviations resulting from whether Stefan or Michael compacts today should remain far behind the decimal point.If I understood the thread starter correctly, the general contractor's offer came after the recommendation of the geotechnical engineer. Nevertheless, I believe that certain deviations simply occur despite experience, as you write under point 3.
However: with an offer after the expert recommendation is available, the corresponding quantities should also be included in the offered amount.Or would you change your opinion if the offer was made only after the report was already available?
If I understood the thread starter correctly, the offer from the general contractor (GU) came after the recommendation of the geotechnical engineer.