CRATER SURVEY,SITE E The crater survey pipes were delivered to Holmes and Narver warehouse department 21 May 1952 with a request for shipment to Edward J. Zadina, Los Alamos Scientific Laboratory, P.O. Box 1663, Los Alamos, N. Mex. The postblast data were observed from 28 the center of the stake. All distances and elevations are in feet. Column 5 Preblast elevation was taken on the top of stake which was flush with surface. Postblast elevation was taken on the surface by stake. April 1952 to 12 May 1952. The following explanations apply to the columns in Table B.4. Column 6 Column 2 point of bend and the elevation recorded. The numberingof the stakes follows the order of listing in letter SDF-649 (Appendix A). The recovered stakes are tagged to correspond. Column 7 A file mark was made at the approximate Column 3 Bent deflection is reckoned clockwise from the line from the stake to Ground Zero, to the end of the bent portion. The azimuth is reckoned at the stake, from north clockwise to Ground Zero. Column 8 Column 4 Distance is measured from Ground Zero to Straight deflection is reckoned from a vertical line through the bottom of the straight portion of pipe.