Vertical Cross Sections Along the Longitudinal Axis of the Wastewater

Vertical cross sections along the longitudinal axis of the wastewater plume on Cape Cod, Massachusetts. Each cross section gives a snapshot of the concentration of dissolved oxygen (upper three, blue) and boron (lower three, green) during 1996, 2000, and 2004. Concentrations are given in micromolar (µM, micromoles/liter). These cross sections show that mobile constituents, such as boron, have been flushed away from the infiltration beds by fresh ground water (flow is from left to right) while dissolved oxygen concentrations have remained low. Black dots show the positions of well screens and multilevel-sampler ports. The cross sections are a modified version of figure 3 from Repert and others, 2006.