...before such conditions are disturbed, notify the Contracting Officer in writing of: (1) Sul»surface or latent physical conditions at the site differing...or (2) unknown physical conditions at the site, of iiu unusual nature, differing materially from those ordinarily encountered and generally recognized...

...nevertheless is whether these conditions were "unknown physical conditions at the site, of any [sic] unusual nature, differing materially from those ordinarily...work of the character provided for in this contract [extra work order] ." However, a preliminary issue is whether the Differing Site Condition clause is...

...conditions at the site differing materially from those indicated in this contract." The second comprises "unknown physical conditions at the site, of an unusual...encountered and generally recognized as inhering in w T ork of the character provided for in this contract." The two categories are expressed in the alternative,...

...trench walls, and sloughing of the walls was the result. This constituted, we believe, a condition of an unusual nature, differing materially from those...recognized as inhering in work of the character provided in the contract (the second category test). In the remainder of the Big Creek canyon and at Park, Leon...

...A" to the Fndings of Fact, Exhibit No. 1. " Appellant's Post-Hearing Brief, p. 13. January 24, 1968 differing materially from those ordinarily encountered...inhering in work of the character provided for in the contract. In its Post-Hearing Brief appellant has denominated this claim as its ''Unknown Physical...

...promptly, and before such conditions are disturbed, 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...

...occurrence of rhyolite constituted an "unknown" condition "of an unusual nature materially differing from those ordinarily encountered and generally recognized...inhering in work of the character provided for in the plans and specifications," within the meaning of article 4 of the contract, and that the eontract...

...figs. 48 and 49. ) It was determined that the conditions encountered were unknown physical conditons of an unusual nature, differing materially from those...as inhering in work of the character provided for, and the contractor was therefore entitled to additional compensation in the amount of $62, 252. 00....

...the site materially differing from those shown on the drawings or indicated in the specifications, or differing materially from those ordinarily encountered...inhering in work of the character provided for in the plans and specification, the attention of the contracting officer shall be called immediately to...

...Contractor shall promptly, and before such conditions are disturbed, notify the Contracting Officer In writing of: (1) subsurface or latent physical conditions...(2) unknown physical conditions at the site, of an inn: SUM) nature, differing materially from those ordinarily encountered and generally recognized as...