48 CFR §52.236-16

As prescribed in 36.516, the contracting officer may insert the following clause in solicitations and contracts when a fixed-price construction contract providing for unit pricing of items and for payment based on quantity surveys is contemplated: Alternate I (APR 1984). If it is determined at a level above that of the contracting officer that it is impracticable for Government personnel to perform the original and final surveys, and the Government wishes the contractor to perform these surveys, substitute the following paragraph (b) for paragraph (b) of the basic clause: