Book Description
Concentrations of purgeable halocarbon and aromatic compounds detected in samples collected from 40 monitoring wells and Six Area D extraction wells exceeded state and federal drinking water standards. These 32 monitoring wells are located on base in Areas A, B, C, D, and Adjacent On-Base Areas, and off-base in the Northwest and Southwest Areas. There was no definable increase from the previous sampling period (1 April through 30 June, 1988). The Area D extraction system is effectively operating to change hydraulic gradients based on differences in hydraulic heads specified for the system. Contaminant concentrations continue to decrease in deep zone monitoring wells. Samples from several middle zone monitoring wells show and decreasing trend except for this sampling period when concentrations increased. Decreasing contaminant concentrations have recently stabilized in shallow zone monitoring wells located outside the extraction system well-field. (FR).