New Jersey Zinc/Mobil Chemical Site: You are invited to comment on the Proposed Pland [sic] and Other Remedies Considered for the South Ditch Sediments: Fact Sheet #8

              New Jersey Zinc/Mobil Chemical Site
You are invited to comment on
The Proposed Pland and Other Remedies Considered For The
South Ditch Sediments
Fact Sheet #8
September 2002
DePue, Illinois
What is the South Ditch? The South Ditch is a ditch
between the plant property of the New Jersey Zinc/Mobil
Chemical Superfund Site and Lake DePue. (For more
information on the site, see page 7.)
Historically, the ditch has received runoff from the former
plant property. Because of the nature of past plant
operations, the runoff contained high levels of metals that
contaminated sediments in the ditch. These contaminated
sediments are called "unnatural" sediments.
In 1995, the State of Illinois and the potentially responsible
parties (PRPs) 1 signed an interim consent order 2. One of
the requirements of that order was for the PRPs to
investigate the sediments in the South Ditch and, if necessary, construct a remedy for the sediments.
The PRPs completed the investigation in 1996.
Alternatives Studied for the South Ditch Sediments
The PRPs studied four main alternatives to remedy the South Ditch sediments. These alternatives are
described on the next two pages. The Illinois EPA has designated one alternative (4b) as the Illinois EPA
proposed plan. The public is invited to comment on all the studied alternatives as well as the proposed
plan.
Costs are given in 1997 dollars, because the study of alternatives was conducted in 1997. All
alternatives except Alternative 1 include institutional controls. In the short term, these controls would
include "No Trespassing" signs and limited fencing. Long-term institutional controls could include
restrictions on the deed of the property limiting certain activities such as excavation, swimming and
fishing.
The PRPs studied four main alternatives to remedy the South Ditch sediments. These alternatives are
described on the next two pages. The Illinois EPA has designated one alternative (4b) as the Illinois EPA
proposed plan. The public is invited to comment on all the studied alternatives as well as the proposed
plan.
Costs are given in 1997 dollars, because the study of alternatives was conducted in 1997. All
alternatives except Alternative 1 include institutional controls. In the short term, these controls would
include "No Trespassing" signs and limited fencing. Long-term institutional controls could include
restrictions on the deed of the property limiting certain activities such as excavation, swimming and
fishing.
Alternative 1 No Action/Natural Recovery.
This alternative is a passive form of action involving natural processes. In this case, the natural process
Fact Sheet #8 - New Jersey Zinc Site Page 1 of 7
http://www.epa.state.il.us/community-relations/fact-sheets/new-jersey-zinc/new-jersey-zin... 5/24/2012