Cperatien Plan CTG 7.3 No, 1-53 the necessity for decontaminatien, The intcrier ef the ship is prcesetved in its "clean" strtus by setting ef the appreprintc damege central cendition ef readiness te seal the ship's envelope. hk. Sheuld the abeve method fail te prevent centaminatian, decont.minatien suits shall be wern te protect the damage contrel parties who must werk on the contaminated sectiens of the ship. In the use of water after the ship has been expesed to contamination, special techniques are required te centreol the centaminating sprey resulting from hosing cperetions. If passible, the hosing of an ebject should be carried en frem the upwind side se that the spray will net drift beck on the epersters. The most satisf-eter” opersting pesition is from 15 to 20 fect from the surface, vertical sur- faces, the water sheuld be directed to strike the surf*ce at an angle of 30 te 45 degrees, The cemplicatien cf a brisk wind can be partially offset by using a wind-break, For hosing down lerge cantamineted areas, a rate of appreximately 4 square feet per minute should be used, Svecial attention must be given to the drainage from these eperations to allow direct flew te dispesal peints over the side, c. Hesing is net the complete answer to decontemintion; serubbing techniques may have to be used, ad. ‘“Weoden surfaces, if cont»minated, can be decontaminated as outlined below under General Boat Decontrmin-tien Precedures, 5. Genersl Boat Deeentamination Procedures, a. If beet exterior, i,e., painted surfece, is contaminated frem p-ssage threugh contaminated water, hesing dewn and scrubbing if necessary should be sufficient te reduee any contamination te well below prescribed telerances, If boat is water-berne, drainage frem hesing down should present no vroblan, Dispersal of radieactive products in the lagoens is anticipated ta be sufficient te prevent recontaminetien of other beats, If interier ef beat is contaminated, hasing down end pumping out ever the side should suffice. Hewever, repeated use ef this method can concentrate some contamination in the bilge pump system which is not desirable, and this pump sheuld be especially monitered. b, Contamination can be intreduced inte beats by cent>minated passengers, radioactive "fall-out" from atcmic burst, er secpage of centaminated water inte bilges. It is considered most likely that any majer contamination int .. hoats will ceme fyem contamination an passengers and from sand unintentiosallr brough on board from centaminated beaches, Uspainted weed will net b*? as readily decentaminable as described sbove, ijiny contamin-tien should be G~III-4