HOL ENGINE ee JOB: To:__De L. Narver,ine Bh Re:Station13/0WlevationChange, FROM: He Le Dietze oe DATE: . 30.October. 1953 Elevations of structures on Site Charlie were based on the level datum adopted during the High vide Line Survey of the island. The elevations of the footings of Station 1341, Site Delta was based on the datum adopted for Sites Able and Baker during the High Tide Line Surveys of these islands. The survey Department did not check the interrelation cf the elevation data until after the floor slab cof Station 131] was formed and the ree inforcing was being placed, Since ccnstruction was far advanced on Site Charlie, the datum on that isiend was adopted for Site Able and Baker, This resulted in a 1.3 foot discrepancy between the elevation of Station 1341 and the elevation of structures on Site Charlie, Tide observations subsequent to the above indicate that the Site Able and Baker datum is correct and tnat of Site Charlie is in error. The cause of the discrepancy was the location of the tide suage in en area where the water level is seriously affected by the formation of a reef. The remainder of the islands on Bikini on which structures requiring an elevation relationship are located, have been placed on a single adopted datum extended by level circuits. ‘this eliminates the possibility of any further discrepancies, WYSZ H. to Dietze, Resident Ensineer. HLD: hw . ces 1, ac nee REPOSITORY oS eorene COLLECTION &6.3<¢64 ATortic ENERGY COMIPSSION S vasto) BOX No £72664 (#608! Al633y 326 -6SV0I70 upvey NATIONAL ANCHIVES -FACIELC sev THWEST KEGIOv SURVEYS FOLDER AYCUS T f 4983 on DEPARTMENT OF ENERGY DECLASSIFICATION REVICWa ORTERMINATION (IPCLE Nut AER:oh 1, CLASSIFICATION RETAINED 2. CLASHAICATION CHANGCD TO: 3. CONTAINS hoNODot DOE CLASSIFIED INFO COORDINATE Draeneinnn | REVIEWE , NARAE: DATE: LASSIFICATION CANCELLED ney 7 . CLASSIFIED INFO BRACKETED an Se : LD agate davies wo ON? was : etine manti on ‘effec no ye epee t da ae ts of a Tinited Cintas Ff ‘ fa an - moa, . - . , . a , . re wt vee 279 abd vvd, my 3 che