Installation Restoration Program. Phase II. Confirmation/Quantification. Stage 1. Volume 1. Technical Report. Sections 4-7.

Abstract : A problem confirmation study was performed at Castle AFB and included 21 potential contaninant source sites identified in the Phase I Report as requiring field investigation. The potential source sites were grouped into 16 investigation sites including the area of a confirmed plume of TCE contamination in ground water. The field investigations, conducted from October 1984 to April 1985 included installation of 27 new monitor wells and 11 shallow lysimeters, collection of sediment samples for surface soil, shallow borings, and drainage ditches, geophysical surveys of three sites, two rounds of surface and groundwater sampling and water level measurements, and pilot test operations on a Base production well. Analytes include votaile organic compounds, TOC, TOX, oil and grease, as well as phenols, nitrate, metals, pesticide and herbicides at selected sites. Of the sixtreen sites investigated, twelve were recommended for further groundwater study, either through continued monitoring of existing wells, or through expansion of the monitoring network. The TCE plume in the shallow aquifer was delineated and recommended for immediate feasibility study; additional investigation to locate the source of the plume and to define its extend in off-Base areas and in an underlying aquifer have also been recommended. Contents of this vol,: Results and Conclusions; Alternatives; Recommendations; References.