“General Conditions" and "Special Conditions", numerous provisions were found to be inapplicable only after modification. As the preparation of the construction specifications entered the final phase, it became apparent that certain modifications to the original criteria would be advisable. The master plan for the preparation of the specifications had contemplated that the construction operations would be segregated into sections conforming to the work performed by the various building trades, But the construction work for scientific structures differed so radically from that required for ordinary structures that it was felt that greater clarity would be obtained if scientific structures were treated as a unit. Therefore specifications for them were incorporated into a separate section with materials and methods peculiar to these structures treated by individual buildings, The ordinary work involved in the construction of scientific structures was covered by references to the appropriate specifications for the types of work. This change in organization of specifications brought up security considerations, It had been originally planned to keep the security classification of the specifications as low as possible by including no information in them as to number, extent, or location of specific facilities, This information was clearly indicated on the drawings and any changes in scope of work could have been expressed on them without addenda to specifications, It had therefore been anticipated that the specifications could be classified "Official Use Only." But the new arrangement and inclusion of building identifications and locations made this impossible. Accordingly, the specifications for scientific structures were put in a separate volume (Volume 4), along with the drawing list, and classified "Secret" by the Chief Security Officer of Holmes & Narver. The other volumes (1, 2 and 3) were classified "Official Use Only". As a final check upon the accuracy of the specifications, duplicate copies of the final drafts were forwarded to Jobsite for review by the personnel engaged in the construction operations, Transmittal was made in two increments, accompanied by memoranda from the Chief Draftsman to the Engineering Manager, the first dated January 5, 1951, and the second February 23, 1951. Both sections were returned from the field by March 24, 1951, and revisions suggested by the field personnel were taken under advisement. the specifications were reproduced, After revisions had been made On April 25, 1951, Holmes & Narver forwarded twenty sets of completed specifications to the Manager, AEC. Los Alamos. Volume 7 (159 nages) included Part I, "General Conditions"; Part II, "Special Conditions"; and Part III, "Technical Provisions", Sections 1 through 18. Volume 2 (142 pages) included Section 19 through 30 of Part III, "Technical Provisions", except for Section 28, "Scientific Structures". Volume 3 (233 pages) included Equipment and Material Specifications (Purchase Specifications). Volume 4 (95 pages) included Section 28 of Part III, Technical Provision, and the drawing list. 5-26 All four