Downloaded from https://www.everyspec.com FM 34-54 CHECKLIST-UNDERGROUND FACILITIES 1. IDENTIFICATION. Native name, military designation, and tunnel number. 2. LOCATION OF PORTALS. a. Map reference. Include series and sheet numbers of both tactical and air-ground series. b. Political unit, kilometer points, UTM coordinates, and geographic coordinates. c. Landmark reference. Description and location of landmark, and azimuth and distance from landmark to nearest portal. 3. LENGTH (portal to portal). 4. TYPE. TGSS. 5. CROSS-SECTION. a. Shape (semicircular, elliptical, horseshoe, square with arched ceiling). b. Width of traveled way. c. Width at widest part. d. Height of widest part. e.
Height of ceiling at center. f. Height of ceiling at edge of traveled way. g. Rise of arch. 6. CONSTRUCTIONS (HORIZONTAL AND VERTICAL). Type, least clearance, and location (meters from nearest portal). 7. RAILROAD TRACKS. a. Number for which tunnel was designed. b. Number in use. c. Gage. d. Center-to-center spacing. e. Cross-reference to railway collection file. 8. HIGHWAY. a. Wearing surface (material, thickness, and condition). b. Base course. c. Subgrade. d. Cross-reference to highway collection file. Figure I-6. Checklist-Underground Facilities. I-18