MEMORANDUM FOR: SUBJECT: CJTF SEVEN . 10 March 1954 Report on “Soil and Wator Sampling Mission \ 1. In compliance with your oral instructions, the undersigned visited Not: . Erilmb, Maloclap, Wotho, Majuro Atolls in the Marshall Islands through 7 March 1954 for the purpose of obtaining carth and drinking water samplos, and of moasur:ing gamma ray dosc rates, and also checked the radiological condition of the S.S., ROQUE on its arrival at Majuro 7 March 1954, 2. The first four atolls wore visited by Marshallese intcorprctor Takushi and the writcr by means of an UF-] amphibious aircraft. Majuro was roached by C47. Erikub might have beon omitted since it was not inhabited, boing property of the Wotjo tribe which goes thoro only occasionally to gather copra. unknowm until after the visit.) (This ms 3. At cach atoll, oly the principal inhabitod island was visited, at cach visitcd island an cffort was made to compose a roproscntative soil avcrago by collceting into a single container sovcral samplcs, cach approximtoly one squarc foot of arca and onc inch depth. Water samples woro collectcd from the principal sources currently in usc. The gamma dose ratcs aro avoragos for the inpabited AarcasSe . ' 4&4. With regard to certain minor discrepancies between the survey methods us~ by Major R. D. Crea and the writcr; it was originally planned to perform the survjointly, and when it became advisable to scparate and survey diffcrent atolls, no time remaincd for discussion of details of techniques, 5. Gamma-ray dose ratcs on Wotje and on Erikub are oach the average of MX-5 and AN/PDR=39 avorage readings which agreed reasonably woll., The MK-5 was rondcer inoperative when the rubber life raft was swamped by surf on the first attompt to launch from the beach at Erikub. Following tho Wotho survey, the PDR-39 develope: a temperaturc-dependent reading of 0.4 - 2 orfhr, so that later readings in this range arc of very dubious reliability. 6. The following tabulation summarizcs the atoll survoy. S is Sail, Wis Water Sample: oo rg Sr Ake ATOLL ISLAND DATE TRE SAMPLE NO WOTJE ORMED 5 Mar 1600 $5 ERIKUB ERIKUB 5 Mar 1715 MR/HR & SAMPLING 3.5 mrfhr, lebeach, 3-mid-vill age, l-back village. w6 4 well plus 4 catch basin. sé 1.5 m/hr. l-mid-village, 1 on path to beach. No inhabit— ants, no water supply found.