WEST LAKE LANDFILL

SUPERFUND SITE
(OPERABLE UNIT I)

This 200-acre site is located about one mile north of
the Interstate 70/270 interchange and four miles west
of Lambert-St. Louis International Airport.The landfill
received soil contaminated with radiological materials.

TIMELINE /g\

MARCH 2016 1^1

Bridgeton, Missouri

Visit: https://www3.epa.gov/region07/cleanup/west_lake_laridfill
Contact: Ben Washburn, Community Involvement Coordinator
washburn.ben@epa.gov | (913) 551-7364 | Toii-free: (800) 223-0425

https://www.facebook.com/WestLakeLandfillSuperfundSite $0 https://twitter.com/WestLakeSite



DISPOSAL &
DISCOVERY

8,700 tons of radiologically
contaminated material was mixed
with about 39,000 tons of soil and
transported to the Landfill.

This mixture was used as daily
cover in routine landfill operations.

1973-1979

REMEDIAL
INVESTIGATION
& FEASIBILITY
STUDY

An investigation of soil and
groundwater in the
radiologically-impacted areas was
completed and alternatives for remedial
action were evaluated.

2000-2006

A

SUPPLEMENTAL
FEASIBILITY STUDY

EPA required the responsible parties to provide
information regarding the steps for and cost of
full excavation of radiologically impacted materials
(RIM). EPA then evaluated the full excavation
option against the 2008 selected remedy and
decided additional studies and investigations were
needed.

2008-2011

REVISED
REMEDY
DECISION

If site's Record of Decision
needs updating, EPA will
publish a revised Remedy
Decision and ask for public
comment.

FUTURE

2=-
3 =-

FINALIZE
REMEDY
DECISION

Following consideration of public
comments on its proposed decision,
EPA will announce details regarding
the final selected remedy.

FUTURE

m

DESIGN &
CONSTRUCTION

Site remedy is put in place, from initial
activities through to completed
construction.

FUTURE

1990

PLACEMENT
ON NATIONAL
PRIORITIES
LIST

West Lake Landfill placed on EPA's
Superfund National Priority List.

r=-p

2008

OPERABLE UNIT I
RECORD OF
DECISION

A remedy was proposed and finalized for the
radiological area. A Record of Decision is a public
document that explains the cleanup method that
will be used at a Superfund site, based on EPA

studies, public comments, and community
concerns.The remedy included consolidation of
waste materials, an enhanced landfill cover and
prevention of future uses that are not appropriate
for a landfill.

2011-2016

REVISED REMEDY
EVALUATION

Additional soil and groundwater
sampling has been performed. The
results of that sampling will be used in
a revised evaluation of various remedial
options, including the 2008 selected
remedy, partial excavation, and full
excavation.

BOB

FUTURE

PUBLIC
COMMENT ON
PROPOSED
DECISION

EPA will publish its proposed decision
on whether or not to make changes
to the 2008 ROD. If changes are
proposed, EPA will announce the
changes and will ask for public
comment on its decision.

E#

FUTURE

CONSENT DECREE

EPA intends to negotiate an agreement with
the responsible parties to perform the cleanup

selected by EPA. That agreement would be
filed with the federal court and finalized after a
public comment period and approval by the

court. If agreement with the responsible
parties cannot be reached, EPA could issue a
Unilateral Administrative Order.

FUTURE

OPERATION &
MAINTENANCE

If hazardous substances remain on

site above levels that allow for
unrestricted use, five-year reviews
are generally required by CERCLA
to confirm that the remedy
remains protective.





COMPLETED

ONGOING

FUTURE

-------