I just received a task order proposal for an observation well and the AE firm listed a lot of assumptions. The AE firm also mentioned some of the pricing is estimated based on not knowing the material (rock, sand, ect.) or site conditions. I checked the IDIQ for 52.236-2 "differing site conditions" and the clause was not included. The FAR matrix does not list 52.236-2 as applicable to FP Services or A&E and that is probably why the clause was not included.
If site conditions are different then the Government and AE assume after starting to drill the well what clause can I use to modify the Task Order. It doesn't appear to be the changes clause 52.243-1 Alt III, because these aren't really Government directed changes or delays. The IDIQ does have 252.243-7002 requests for equitable adjustment, but isn't the road I would prefer to go down.
Any suggestions? I could probably include 52.236-2 in the task order solicitation.