Ground water is the principal source of drinking water in the
vicinity of the Ciba-Geigy Superfund site near Toms River, Ocean County,
New Jersey. The presence of earlier identified point sources of
organic-compound and, to a lesser extent, metals contamination dt the
Ciba-Geigy Toms River Chemical Company Plant has resulted-in severe
degradation of ground-water quality and has increased the potentiil for
water-supply problems (NUS Corporation, 1988). The point sources of
contamination include a manufacturing area, a backfilled-lagoons area, a
former fire-prevention training area, several sludge-disposal areas, and
a drum-disposal area. A borrow area also is considered a potential
source of contamination (Camp Dresser 6 McKee, Inc., 1989).
The U.S. Environmental Protection Agency requested that the U.S.
Geological Survey evaluate the hydrogeologic conditions in the Kirkwood-
Cohansey aquifer system (Zapecza, 1989) and the extent of ground-water
contamination on the property of the plant (which includes the Superfund
site) and in Winding River Park, which borders the Toms River
immediately to the east of the Superfund site (Barton, 1989). This
investigation included an electromagnetic-induction survey covering
45 line miles throughout the site and a ground-penetrating-radar survey
in part of the borrow area.
The quality assurance/quality control plan (QA/QC) for the
electromagnetic-induction survey established guidelines for performance,
system audits, and data validation, and set control limits for
instrument and procedural precision. The QA/QC plan for the groundpenetrating-
radar survey sets guidelines for performance and system
audits.
