In plain English
FAR 52.236-4, Physical Data, is a contract clause prescribed at FAR 36.504, most recently dated Apr 1984. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 36.504 , insert the following clause in solicitations and contracts when a fixed-price construction contract is contemplated and physical data (e.g., test borings, hydrographic, weather conditions data) will be furnished or made available to offerors. All information to be furnished or made available to offerors before award that pertains to the performance of the work should be identified in the clause. When paragraphs are not applicable they may be deleted.
Prescribing reference: FAR 36.504.
The official text, verbatim
As prescribed in 36.504 , insert the following clause in solicitations and contracts when a fixed-price construction contract is contemplated and physical data (e.g., test borings, hydrographic, weather conditions data) will be furnished or made available to offerors. All information to be furnished or made available to offerors before award that pertains to the performance of the work should be identified in the clause. When paragraphs are not applicable they may be deleted.
Physical Data (Apr 1984)
Data and information furnished or referred to below is for the Contractor’s information. The Government shall not be responsible for any interpretation of or conclusion drawn from the data or information by the Contractor.
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(a) The indications of physical conditions on the drawings and in the specifications are the result of site investigations by __________ [insert a description of investigational methods used, such as surveys, auger borings, core borings, test pits, probings, test tunnels].
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(b) Weather conditions __________ [insert a summary of weather records and warnings].
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(c) Transportation facilities _________ [insert a summary of transportation facilities providing access from the site, including information about their availability and limitations].
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(d) ___________ [insert other pertinent information].
(End of clause)