This report summarizes the contamination observed at the Hanford Works and vicinity for the period October, November, and December, 1947. Trend charts showing trend of contamination for the various sampling locations are only included where a true trend can be established for the three month period; a thorough analysis of all trends will be considered in detail in the annual report from this section. The report is divided into the following topic sections: Meteorological -- dissolving data; beta contamination in the air and the radiation levels in air; alpha and beta contamination in the Columbia River; beta contamination in the rain and snow; alpha and beta contamination in drinking water; beta contamination on vegetation; and alpha and beta contamination in Hanford Wastes. An appraisal and review of all the results is considered in detail for each section. Statistical analysis is used whenever possible to determine significant values and differences in levels of contamination measured.