A system was conceived of sprinkling the ground by employment of a "Rainmaker" sprinkler array while carrying out earth-moving operation, and a token quantity of this equipment was sent to the Jobsite for trial purposes. A demonstration proved highly successful, ani AEC officials gave unqualified approval. This method of preventing dust during the period of grading "shot areas" was used on all shot islands with excellent results, ani latent contamination ani radioactivity levels were reduced to well below tolerance. During these operations, continuous surveillance was exercised by "rad-safety monitors" for airborne radioactive particles and for radiation and no hazardous practices were tolerated. Educational lectures by rad-safety personnel to those engaged in the operation helped to avoid unwarranted fears and to engender respect for the safety procedures prescribed. As an additional precaution, all personnel entering or working in contaminated areas were required to wear protective clothing am carry standard film dosimeters. A record of all exposures to radio- activity was kept at the Los Alamos Scientific Laboratory. beyond tolerance were recorded. FI No exposures CTO A Fire Department was organized to provide fire protection and prevention, and was placed under the supervision of the Assistant Safety Engineer. The department had three units of mobile apparatus -—- two 1-1/2 ton Chevrolet trucks, one with a 500-gpm pump and the other pro- viding 300-gpm pumping capacity, and one American La France 4 x 2 Ford truck with 300-gpm pumping capacity. This equipment was located at Parry, Engebi, and Biijiri, where the greatest fire hazard existed. All buildings, structures, marine craft, and hazardous locations were provided with an adequate number of the appropriate type fire extinguishers. Four jeeps, obtained from the Army, were equipped with 150 pounds of COm and other fire-fighting equipment and stationed at the various air strips for use as crash trucks. One Fire Chief was utilised exclusively for making fire prevention inspections, checking fire extinguishers, etc., throughout the Jobsite. During the seventeen-month period (Jamary 1, 1950 through May 31, 1951) a total of forty-six fires occurred with a fire loss totaling $1,473.61. SANTTATION In view of the importance of insect control throughout the Atoll it 1s considered to be appropriate to set forward at length the steps followed in the insect control program. l. The daily spray of fog smoke was used at Parry Island to control flies. This spray was discharged through the exhaust of a specially equipped truck. "No Spray", an oil—base insecticide containing 5 per cent DDT, was used approximately one-half the time and a lindane insecticide solution of one part of insecticide to twenty parts of water was used the balance of the time. The two insecticides were used in order to avoid a build-up of insect resistance to either one. 10-6