Ground-Water Age, Flow and Quality Near a Landfill, and Changes in Ground-WaterConditions from 1976 to 1996 in the Swinomish Indian Reservation, Northwestern Washington

摘要

The purpose of this report is to describe the results of two related studies: astudy of ground-water age, flow, and quality near a landfill in the south-central part of the Swinomish Indian Reservation; and a study changes in ground-water conditions for the entire reservation from 1976 to 1996. To provide background information for understanding the results of the two studies, the ground-water flow system of the study area was briefly described using existing data and information and data collected for the two studies. The scope of the study at the ground water near the landfill was to collect water samples from existing wells near the landfill and to analyze the samples for constituents related to ground-water age, flow, and quality. The ground-water conditions that are important to the Swinomish Indian Tribal Authority and that were most suitable for comparison were ground-water discharge, ground-water levels, and extent of seawater intrusion.