Perchlorate Reconnaissance Sampling in Streams and Groundwater

Perchlorate samples were collected using methods that ensured representative surface-water and groundwater samples. For rivers and streams this means that any water-quality variability with depth or variability across the river was integrated into the sample. For groundwater this means that stagnant water in the well casing was removed before water from the aquifer was collected. Once the sample was obtained, appropriate filtration and preservation techniques were used to ensure that water quality did not change during transit to the laboratory.