Column 4 The following explanations apply to the columnsin Table B.3. The preblastelevation of reference mark Column 1 The station numbers are for Operation Greenhouse. (R.M.) was taken at a point indicated in the foregoing sketch, on the 3-in. steel plate. Column § The postblast ground elevations were taken 17 July 1951. Station 27a was not located at Column 2 that time. The distance of working point to Ground Zero is indicated in the following sketch. 128° 128° Column 8 ‘ | 9 = ° w.P. |___g- The postblast distance of the working point . to Ground Zero was taken to approximately the same point ag the preblast distance. All four aM M. concrete blocks were damagedbythe blast. ° —— - — TOGROUNDZERO Column 7 bre Q.73' eof . S The postblast elevation of the reference mark (R.M.) was taken to a point on the concrete block approximately 0.73 ft from the working point. ' ~ The steel plates were missing from all four | stations. / TABLE B.3 CRATERSURVEY,SITE C Prebiast To Ground Zero Elev. Station Distance (ft) Azimuth of R.M. (ft) (1) (2) (3) (4) 27a 27b 27e 27d 12.00 68.97 170.94 240.00 83°S0'02” 83°50'029 83°50'02" 83°50’02” 9.32 9.42 9.47 9.04 31 27