...provided In thi* contract. no cbarge for any extra work or material will be allowed. 4. CHANGED CONDITIONS The Contractor shall promptly, and before such conditions...disturbed, notify the Contracting Officer In writing of: fa) -ni.vtirr.-M. or latent [diyaical conditions at the site differing materially from those indicated...

...promptly, and l»efore such conditions are dfftturtx>d. notify the Contracting Officer in writing of: (a ) subsurface or latent physical conditions at the site...materially from those indicated In this contract, or (b) unknown physical conditions at the site, of an unusual nature, differing materially from those...

...Itefore such conditions are disturbed, notify the Contracting Officer In writing of: fa > Kiilwtirface or latent physical conditions at the site differing...materially from those indicated In this contract, or (b) unknown physical conditions at the site, of an unusual nature, differing materially from those...

...be borne by appellant. Clause 4 applies to two categories of changed conditions. The first comprises "subsurface or latent physical conditions at the site...materially from those indicated in this contract." The second comprises "unknown physical conditions at the site, of an unusual nature, differing materially...

...pricing data clause (see 8 7.104-29). § 7.602-4 Changed conditions. CHANGED CONDITIONS (JUNE 1964) The Contractor shall promptly, and before such conditions...disturbed, notify the Contracting Officer In writing at: (a) subsurface or latent physical conditions at the site differing materially from those indicated...

...in completing the contract work. Clause 4 refers to two different categories of changed conditions: (1) subsurface or latent physical conditions at the...site differing materially from those indicated in the contract, and (2) unknown physical conditions at the site, of an unusual nature, differing materially...