The contractor carrying out repair work on a £116m guided busway in Cambridgeshire is making progress but falling behind an agreed schedule.
A county council report on BAM Nuttall's work is to go before its cabinet on Tuesday for discussion.
The main construction work on the route from St Ives to Cambridge is complete but some issues are yet to be resolved.
Sections of the road and parking areas are vulnerable to flooding and concern about expansion joints has been raised.
The council claims parts of a cycleway have been built at too low level causing it to flood.
The contractor is to meet with the Environment Agency to look at implications of raising the track.
Offer of help
BAM Nuttall is also to drill boreholes to check foundations on some short stretches are suitable for the soil conditions.
The contractor said the delay drilling the boreholes meant it did not expect to hit its mid-June deadline for submitting the results.
The council has also asked for BAM Nuttall to consider a simpler solution to the problem of water ponding at St Ives Park & Ride site.
The contractor has promised to provide final calculations to show gaps between the guideway concrete beams will allow them to expand during periods of hot weather.
Bob Menzies, from Cambridgeshire County Council, said: "There has continued to be progress by the contractor on all issues, but as yet we have not seen any of them ticked off the list.
"The ball is in the contractor's court, but we will continue to do all we can to help BAM Nuttall move these issues forward."
BAM Nuttall declined to comment on the progress report.