When the location cannot be dissociated from the undertaking of the operation itself for technical reasons communicated by the location operator to the person mentioned in the first paragraph of I of Article R. 4412-97, the latter has the location carried out as the operation progresses under conditions specified, for each field of activity, by the orders mentioned in II of the same article. When it becomes apparent during the course of the operation that it falls wholly or partly within one of the cases mentioned in I of article R. 4412-97-3, the measures provided for in II of this article may be applied.