Column 3 The following explanations apply to the columns in Table B.6. Distance is from working point to Ground Zero. Column 1 Column 4 The station numbers are for Operation Greenhouse. Elevation taken on corner of coverplate, Stations 27a to d, except as noted; on foundation of Stations 121a to e. Column 2 Column 5 Azimuth is reckoned at the station clockwise from North to Ground Zero. as preblast elevation. TABLE B.6 Elevation taken at approximately same point CRATER SURVEY,SITE E W.P. to Ground Zero Station Azimuth Distance (ft) (1) (2) (3) 27a 27b 27c¢ 27d 121a 121b 121c 121d 121le 191°38’16" 90°00'00" 73°39'12" 73°39'/129 96°00’00* 116°00’00" 136°00'00" 156°00'00” 176°00'00" 12.00 69.00 171.00 . 240.00 175.00 175.00 175.00 175.00 175.00 * Cover gone; elevation on concrete block. 37 Preblast Elevation (ft) (4) 7.57 7.19 7.71 8.38 7.52 7.44 7.34 7.43 7.47 °