Environmental Monitoring Report on the Status of Ground Water Beneath the Hanford Site,January--December 1977.

摘要

An evaluation of the status of ground-water contamination resulting from Hanford's onsite discharges is presented. Data collected during 1977describe the movement of the major plumes (beta /sub t/,exp 3 H,NO exp -3 ) that respond to the influences of ground-water flow,ionic dispersion and radioactive decay. The total beta plume continues to recede. A continuation of the study to ascertain the contributors to this plume indicates that the suspected highly mobile species do not exist. The tritium plume continues to expand and is mapped as having reached the Columbia River,although its contribution to the river cannot be distinguished from that attributable to atmospheric fallout. Nitrate concentrations in the vicinity of the 100-H Area have risen rapidly due to a leaking evaporation facility. The results of a study to determine the vertical distribution of contaminants in the Hanford ground-water system indicate that the vast majority of contaminants are stratified in the upper portions of the unconfined aquifer. (ERA citation 03:041535)