Document ID: EPA-HQ-OPPT-2003-0012-0044
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2003-05-14T04:00Z

JANUARY
2003
BASELINE
C­
8
SAMPLING
DUPONT
FAYETTEVILLE
WORKS
FAYETTEVILLE,
NORTH
CAROLINA
Date:
March
2003
Project
No.:
18983753.00037
CORPORATE
REMEDIATION
GROUP
An
Alliance
between
DuPont
and
URS
Diamond
Barley
Mill
Plaza,
Building
27
Wilmington,
Delaware
19805
January
2003
Baseline
C­
8
Sampling
Fayetteville
Scope.
doc
Mar.
6,
03
1
Wilmington,
DE
Introduction
During
the
week
of
January
27th
2003,
groundwater
was
sampled
from
four
monitoring
wells
at
the
DuPont
Fayetteville
Works.
In
addition,
a
combined
surface
and
wastewater
sample
was
collected
above
Outfall­
002.
These
samples
were
collected
in
order
to
establish
baseline
conditions
at
the
facility
during
the
initial
activation
of
APFO
(
C­
8)
production.

C­
8
Sampling
Prior
to
initiating
sampling
activities,
well
locations
were
field
identified
and
sampling
locations
were
selected
based
on
site
coverage
and
accessibility.
Figure
1
(
attached)
shows
the
locations
of
the
four
wells
selected
for
sampling.
Before
sampling
activities
began,
depth
to
water
and
depth
to
bottom
were
measured
for
each
well
to
the
nearest
one
hundredth
of
a
foot.

Prior
to
sampling,
monitoring
wells
were
purged
using
low­
flow
sampling
methods
where
possible.
The
low­
flow
bladder
pump
was
gently
lowered
to
approximately
the
middle
of
the
screened
interval
in
the
well
and
the
well
was
purged.
During
low­
flow
purging,
pH,
specific
conductance,
dissolved
oxygen,
oxidation­
reduction
potential
and
temperature
were
monitored
approximately
every
three
minutes
using
a
flow­
through
monitoring
cell.
Purging
was
considered
complete
when
all
field
parameters
stabilized
(
variations
in
values
were
within
10
percent
of
each
other
for
three
consecutive
readings
three
minutes
apart).
Once
field
parameters
stabilized,
groundwater
was
sampled
directly
from
the
end
of
the
discharge
tubing.
Wells
SMW­
01,
NAF­
01
and
MW­
1S
were
sampled
using
this
low­
flow
sampling
method.

Alternatively,
if
low­
flow
purging
was
not
practical
due
to
field
conditions
(
i.
e.
too
little
water
in
the
well),
monitoring
wells
were
evacuated
using
a
disposable
bailer.
Well
evacuation
stopped
when
at
least
three
volumes
were
evacuated
and
three
consecutive
readings
of
pH
and
specific
conductance
were
stabilized
to
within
ten
percent.
After
evacuation
and
parameter
stabilization,
the
groundwater
was
sampled
directly
from
a
disposable
bailer.
Well
SMW­
02
was
sampled
using
this
method.

The
combined
surface
and
wastewater
sample
was
collected
approximately
ten
feet
upstream
from
Outfall­
002,
after
the
confluence
of
all
plant
discharges.
The
location
of
Outfall­
002
is
shown
on
Figure
1
(
attached).
The
water
sample
was
collected
by
submerging
the
sample
bottle
into
the
water
and
then
filling
the
bottle.
All
equipment
used
for
sampling
activities
was
pre­
cleaned
or
was
dedicated
as
per
the
Groundwater
Investigation
Quality
Assurance
Project
Plan
For
Washington
Works
Plant
(
QAPP),
dated
January
2002.
All
samples
were
collected
and
handled
in
a
manner
described
in
the
QAPP,
including
the
sample
collected
above
Outfall­
002.
January
2003
Baseline
C­
8
Sampling
Fayetteville
Scope.
doc
Mar.
6,
03
2
Wilmington,
DE
C­
8
Results
The
C­
8
results
for
the
four
wells
and
Outfall­
002
are
presented
in
Table
1
(
attached).
This
table
provides
the
sample
name
and
date
of
the
sample,
the
depth
to
water
and
depth
to
bottom
for
each
well,
the
measured
C­
8
result
in
ug/
l,
and
comments,
if
applicable.
The
groundwater
from
well
NAF­
01
is
the
only
sample
that
had
a
detectable
concentration
of
C­
8.
The
concentration
measured
in
this
well
was
0.0649
ug/
l.
Samples
from
the
other
wells
and
the
outfall
had
C­
8
concentrations
that
were
either
below
the
practical
quantification
limit
of
0.05
ug/
l
(
NQ)
or
nondetectable
(
less
than
0.01
ug/
l;
ND).
Table
1
January
2003
­
Baseline
C­
8
Sampling
DuPont
Fayetteville
Works
Fayetteville,
North
Carolina
Sample
Name
Date
Depth
to
Water
(
ft.)
Depth
to
Bottom
(
ft.)
C­
8(
ug/
L)
Comments
SMW­
01
1/
27/
2003
13.55
22.84
ND(<
0.01)
shallow
well
installed
1/
21/
03
for
C­
8
sampling
SMW­
02
1/
27/
2003
14.79
17.12
ND(<
0.01)
shallow
well
installed
1/
21/
03
for
C­
8
sampling,
well
bailed
due
to
low
water
level
NAF­
01
1/
27/
2003
7.14
18.31
0.0649
MW­
1S
1/
28/
2003
18.81
32.25
NQ(<
0.05)
MW­
1S­
2
1/
28/
2003
18.81
32.25
NQ(<
0.05)
duplicate
sample
Outfall­
002
1/
28/
2003
­
­
­
­
NQ(<
0.05)
water
is
very
foamy,
sample
collected
upstream
of
outfall
sampling
point
but
after
confluence
of
all
plant
discharges
3/
6/
2003
Page
1
fayetteville.
xls