You may be going too far. Where you have taken reasonable steps to ensure competency of your appointment, and are additionally reasonably satisfied that appointment has additional competent support/advice to validate the competency of the specific task (presumably referenced in the original RAMS) and that things are progressing as they were described, then there is little to be served by doubling-up on that validation (and it can often lead to confusion and dispute)? The on-site and Project specific focus from a Client and PC perspective should now be on ensuring adequate communication, cooperation and coordination of any overlapping aspects.

As PC you would check all relevent documentation and your responsible for ensuring that the ground can take any additional loadings imposed on it, possibly temporary works involvement. Other than that generally if contract lift the duties remain with the crane company/AP.

Jason You have been given answers above that are all correct. As PC you are entitled to review the MS from your sub contractor at whatever level you deem to be appropriate. This happens daily on CPA Contract lifts on many UKCG sites. I would never question this as there is no hiding places if something goes wrong. Experts will tell you that on a Contract Lift everything apart from the ground conditions is the responsibility of the crane company. This is wrong because as a crane company they must ensure SSOW for their employees how can they do this if they do not ensure that they have been given the correct figures for the ground loadings supplied. This is not me opening a can of worms just stating a fact that from the first site visit through to the crane completing the lifts and leaving site everyone PC, SUBBY & Crane company are all responsible. Some good stuff on the CPA site to assist but you have to go to the HASWA for ultimate responsibilities. Regards Alex