Document ID: EPA-HQ-OW-2003-0074-0550
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2003-12-24T05:00Z

­
1
­
PETROLEUM
CONTAMINATED
WATER
­
General
Permit
FACT
SHEET
WPDES
Permit
No.
WI­
0046531­
3
April
2001
GENERAL
PERMIT
COVERAGE
General
Permits
(
GP)
are
designed
to
cover
discharges
from
a
class
of
facilities
or
industries
that
are
similar
in
nature.
When
a
GP
is
issued,
all
facilities
meeting
its
requirements
are
covered
by
the
GP.
GP's
currently
exist
for
groundwater
remediation,
noncontact
cooling
water,
swimming
pools,
and
numerous
other
types
of
facilities.
For
facilities
that
are
eligible
for
coverage
under
a
GP,
the
Department
sends
a
cover
letter
and
a
copy
of
the
permit
to
the
facility.
The
cover
letter
includes
the
Department's
determination
that
a
facility's
discharge
is
covered
under
the
GP
and
may
specify
alternate
requirements
outlined
in
the
permit
such
as
modified
sampling
frequencies
for
certain
parameters
or
the
inclusion
of
monitoring
for
parameters
in
addition
to
those
requiring
regular
monitoring.

MORE
THAN
ONE
GP
CAN
APPLY
A
facility
may
need
to
be
covered
under
more
than
one
GP,
depending
on
the
different
types
of
wastestreams
that
a
facility
discharges.
A
facility
that
manufacturers
concrete
block
could
also
mine
gravel
on
site.
The
wastewater
from
the
concrete
block
operation
could
be
discharged
in
compliance
with
one
GP
and
the
wastewater
from
the
gravel
mining
operation
could
be
discharged
in
compliance
with
a
different
GP.
However,
a
facility
that
requires
an
individual
permit
for
any
part
of
its
discharge
may
have
all
of
its
discharges
covered
under
an
individual
permit.
An
exception
would
be
for
a
facility
that
commences
a
discharge
that
is
eligible
for
a
GP,
after
a
specific
permit
has
already
been
issued
or
reissued
for
the
facility.
For
example,
a
facility
that
currently
has
an
individual
permit
may
begin
a
process
that
results
in
the
discharge
of
noncontact
cooling
water.
The
noncontact
cooling
water
discharge
can
be
covered
under
a
GP,
as
long
as
it
meets
the
requirements
of
the
GP,
until
the
individual
permit
can
be
reissued
or
modified
to
include
the
noncontact
cooling
water
discharge.
Storm
water
GPs
may
always
be
kept
separate
from
an
individual
permit
and
not
combined
with
it.

GENERAL
DESCRIPTION
OF
OPERATIONS
COVERED
UNDER
THIS
GP
This
General
Permit
(
GP)
is
applicable
to
point
source
discharges
of
wastewater
that
has
been
contaminated
with
petroleum.
Petroleum
products
may
include,
but
are
not
limited
to:
gasoline,
diesel
fuel,
aircraft
fuel,
jet
fuel,
heating
oils,
and
lubrication
oils.
Three
types
of
water
contaminated
by
petroleum
products
may
be
discharged
under
this
permit
as
described
below:

A.
Petroleum
Contact
Water
(
excluding
tank
bottom
water)

The
transfer
of
petroleum
products
and
the
general
operation
of
equipment
at
these
facilities
typically
result
in
small
spills
and
drippings
of
petroleum
products
that
become
commingled
with
water
from
natural
and
artificial
sources.
In
addition,
storm
water
that
falls
within
containment
areas
at
facilities
storing
these
types
of
fuels
may
become
contaminated
with
petroleum
products.
These
contaminated
waters
contain
free
phase
(
not
emulsified
or
dissolved)
petroleum
products
and
may
be
covered
by
this
GP.
Examples
of
facilities
that
may
be
regulated
by
this
GP
include
vehicular
fueling,
railroad
yards,
airports,
and
petroleum
tank
farm
operations.
A
standard
treatment
system
for
the
removal
of
free
phase
petroleum
products
consists
of
an
oil/
water
separator.

B.
Tank
Bottom
Water
Water
collects
in
petroleum
storage
tanks
due
to
condensation
and
infiltration
of
rain
and
snow.
The
volume
of
water
collected
in
a
tank
over
time
depends
on
the
tank
design,
precipitation,
ambient
temperature,
and
other
factors.
The
wastewater
drained
from
the
storage
tanks
requires
collection
and
treatment
prior
to
discharge.
The
largest
volumes
of
wastewaters
will
come
from
the
bulk
petroleum
­
2
­
storage
tank
facilities;
these
are
the
facilities
anticipated
to
be
regulated
by
this
GP.
However,
this
GP
may
be
appropriate
for
regulating
other
facilities
that
store
petroleum
products
and
drain
the
water
from
the
storage
tanks.

When
water
is
removed
from
a
tank,
it
has
usually
been
in
contact
with
petroleum
products
for
an
extended
period
of
time.
The
waste
removed
from
the
bottom
of
the
tanks
(
tank
bottoms)
contains
a
limited,
and
usually
small,
amount
of
free
product,
water
saturated
with
dissolved
petroleum
products,
and
sometimes
water
with
emulsified
petroleum
products.
The
water
removed
from
petroleum
storage
tanks
requires
more
extensive
treatment
than
other
wastewaters
contaminated
with
petroleum
products
because
of
the
dissolved
and
emulsified
petroleum
products.
Commonly,
oil/
water
separators
are
used
as
pretreatment
to
remove
free
product
from
the
wastewater.
Treatment
for
removal
of
dissolved
petroleum
products
may
include:
stripping,
activated
carbon,
activated
clays,
and
distillation.
Treatment
for
removal
of
emulsified
petroleum
products
may
include
thermal
or
chemical
treatment.

C.
Scrap
and
Waste
Storage
Area
Oily
Water
Storage
areas
for
scrap
and
waste
materials,
especially
scrap
metal,
may
generate
an
"
oily
wastewater"
from
storm
water
contacting
the
material
during
storage.
This
petroleum
contaminated
storm
water
may
not
be
discharged
to
waters
of
the
state
unless
it
is
treated
and
complies
with
the
treatment
technology
based
effluent
limits
contained
in
this
permit.
This
contaminated
wastewater
may
contain
a
combination
of
free
product
and
dissolved
petroleum
products,
depending
upon
the
exposure
time
Facilities
in
the
business
of
recycling
of
scrap
and
waste
materials
are
typically
covered
under
one
of
two
general
storm
water
permits,
either
the
"
Recycling
of
Scrap
and
Waste
Materials"
permit
WI­
S058831,
or
the
"
Tier
1"
industrial
permit"
WI­
S067849.
When
treatment
of
the
"
oil
wastewater"
is
necessary,
because
best
management
practices
can
not
control
the
petroleum
product
contamination,
the
facility
must
obtain
coverage
under
this
permit
to
discharge
from
the
treatment
system.
Treatment
for
removal
of
the
"
oily
wastewater"
may
include
an
oil/
water
separator
and
activated
carbon
absorption
system.

A
facility
is
not
eligible
for
coverage
under
this
general
permit
to
discharge
process
wastewater
that
may
contaminate
storm
water.
Process
wastewater
would
include
discharges
from
oily
scrap
waste
processing
areas
such
as
metal
shredding,
washing,
or
engine
block
breaking.
When
processing
is
involved,
metal
contamination
of
the
wastewater
is
likely,
that
requires
treatment.
An
individual
industrial
WPDES
permit
is
necessary
for
process
wastewater
discharges,
which
would
contain
site
specific
effluent
limits
for
a
discharge.

RATIONALE
FOR
PERMIT
REQUIREMENTS
A.
APPLICABILITY
CRITERIA
(
1)
Facilities
Covered
The
permit
is
applicable
to
discharges
of
wastewater
contaminated
with
petroleum
products,
including
discharges
from
vehicular
fueling,
railroad
yards,
airports,
and
petroleum
tank
farms.
The
previous
issuance
of
this
permit
did
not
specifically
cover
discharges
from
scrap
metal
storage
areas.
The
"
oily
wastewater"
that
may
be
generated
by
facility
that
recycle
scrap
and
waste
materials,
is
now
eligible
for
coverage
under
this
general
permit,
which
will
regulate
the
discharge.

(
2)
Facilities
not
covered
Contaminated
Groundwater:
This
permit
does
not
apply
to
discharges
of
contaminated
groundwater.
Discharges
of
treated
contaminated
groundwater
may
be
eligible
for
the
remedial
action
GP
(
WI­
0046566­
3).
­
3
­
Wetlands:
Discharges
covered
under
this
permit
shall
meet
the
wetland
protection
requirements
of
ch.
NR
103,
Wis.
Adm.
Code,
and
shall
not
significantly
adversely
impact
wetlands.
For
discharges
that
impact
wetlands,
a
facility
will
need
to
submit
information
that
allows
the
Department
to
determine
if
a
discharge
meets
code
requirements.

Outstanding
and
Exceptional
Resource
Waters:
Discharges
to
outstanding
and
exceptional
resource
waters
are
not
authorized
by
this
permit.
Regulation
of
discharges
to
outstanding
and
exceptional
resource
waters
requires
an
individual
permit
which
provides
the
oversight
and
discharge
limitations
necessary
to
protect
these
types
of
receiving
waters.

Surface
Water
and
Groundwater
Standards:
The
discharges
from
facilities
eligible
for
this
permit
are
not
expected
to
exceed
any
surface
water
or
groundwater
standards.
Facilities
with
discharges
that
may
violate
surface
water
quality
standards
or
groundwater
quality
standards
require
the
oversight
available
under
an
individual
permit.

Bioaccumulating
Toxic
Substances:
The
discharges
from
facilities
eligible
for
this
permit
are
not
expected
to
contain
any
of
the
21
bioaccumulating
toxic
substances.
This
permit
categorically
does
not
authorize
a
discharge
that
would
add
detectable
quantities
of
any
of
the
21
bioaccumulating
toxic
substances
listed
in
the
permit.
Regulation
of
these
substances
requires
an
individual
permit.

B.
REQUIREMENTS
FOR
ALL
COVERED
FACILITIES
(
1)
Required
Treatment:
All
wastewater
contaminated
with
petroleum
products
requires
treatment
to
protect
surface
water
and
groundwater.
Facilities
without
treatment
equipment
will
be
unable
to
control
the
discharge
quality
and
will
not
be
in
compliance
with
this
GP.
A
possible
exception
may
be
discharges
of
secondary
containment
water
from
petroleum
bulk
stations
and
terminals.
Precipitation
must
be
taken
into
account
for
exposed
settling
systems.
Ch.
NR
205,
Wis.
Adm.
Code
identifies
the
design
rainfall
amount
and
probable
intensity
of
10­
year
and
25­
year,
24­
hour
rainfall
events
for
locations
in
Wisconsin.
This
permit
only
requires
that
treatment
systems
be
capable
of
handling
the
water
resulting
from
a
storm
having
a
10­
year,
24­
hour
event
frequency
that
falls
within
or
flows
into
the
area
of
the
treatment/
disposal
system.
This
design
parameter
is
common
to
industrial
treatment
facilities
in
Wisconsin.
Treatment
systems
must
have
sufficient
capacity
to
allow
adequate
retention
time
for
treatment.

(
a)
Petroleum
Contact
Water
(
excluding
tank
bottom
water):
Wastewater
regulated
by
this
section
of
the
GP
will
contain
oil
&
grease.
The
permit
requires
treatment
by
an
adequately
sized,
designed,
and
functioning
oil/
water
separator,
except
for
certain
types
of
discharges
from
petroleum
bulk
stations
and
terminals.
This
provides
simple,
un­
aided,
gravity
separation
of
the
oil
from
collected
water.
A
few
important
common
features
of
oil/
water
separators
include:
a
small
inlet
under­
flow
baffle
extending
a
short
distance
under
the
operating
level
of
the
wastewater
for
distribution
of
the
incoming
wastewater
across
the
cross
section
of
the
separator,
a
large
outlet
under­
flow
baffle
that
extends
far
below
the
water
surface
to
prevent
separated
oil
from
exiting
the
device,
and
a
method
for
removal
of
the
collected
oil
from
the
surface
of
the
water
in
the
body
of
the
oil/
water
separator.
Some
of
the
methods
for
removal
of
petroleum
products
from
the
body
of
the
oil/
water
separator
include:
rope
skimmers,
paddle
skimmers,
semi­
permeable
membranes,
absorbents,
and
manual
removal.
Oil/
water
separator
equipment
may
also
include:
extensive
baffle
systems,
inclined
plates,
coalescing
media,
and
air
flotation
systems.
The
separated
petroleum
products
are
usually
stored
in
slop
tanks
for
recycle.

(
b)
Tank
Bottom
Water:
Wastewater
regulated
by
this
section
of
the
GP
will
contain
dissolved
or
emulsified
petroleum
products
that
cannot
be
removed
by
an
oil/
water
separator.
Methods
for
removing
dissolved
or
emulsified
petroleum
products
from
water
include
stripping,
chemical
addition,
dissolved
air
floatation
(
DAF),
activated
carbon,
activated
clays,
thermal
treatment,
and
distillation.
Activated
clays
or
carbon
units
(
or
tanks)
are
used
to
remove
­
4
­
contaminants
from
water
resulting
from
contact
with
the
heavier
end
hydrocarbons.
To
protect
against
contaminants
breaking
through
carbon
or
clay
units,
two
units
are
required
in
series
when
this
type
of
treatment
is
used.
The
activated
clays
and
carbon
will
remove
insoluble
organics
and
color.
Hydrocarbons
are
adsorbed
in
the
following
order:
unsaturates,
aromatics,
naphthenes,
and
paraffins.
In
each
series,
the
high
molecular
weight
hydrocarbons
are
adsorbed
more
readily.
Resinous
and
asphaltic
substances
are
actively
adsorbed.
Since
wastewater
contaminated
strictly
with
gasoline
mostly
contains
low
molecular
weight,
saturated,
paraffin
hydrocarbons,
these
wastewaters
are
usually
not
treated
by
activated
clay
or
carbon
filters;
rather
air
stripping
is
used
to
volatilize
contaminants
from
the
water.

(
c)
Scrap
and
Waste
Storage
Area
Oily
Water:
Wastewater
regulated
by
this
section
of
the
GP
will
contain
oil
and
grease,
and
dissolved
or
emulsified
petroleum
products
that
cannot
all
be
removed
by
an
oil/
water
separator.
Methods
for
removing
dissolved
or
emulsified
petroleum
products
from
water
would
be
similar
to
the
tank
bottom
water
described
above.

(
2)
Discharges
of
Wastewater
Collected
in
Secondary
Containment
Structures
from
Petroleum
Bulk
Stations
and
Terminals:
In
some
cases,
this
wastewater
is
basically
storm
water
that
either
may
not
contain
petroleum
products
or
may
contain
such
low
concentrations
that
treatment
is
not
necessary
prior
to
discharge.
The
permit
takes
this
into
account
by
allowing
wastewater
collected
in
secondary
containment
structures
that
meets
criteria
[
some
of
which
are
outlined
in
the
Spill
Prevention
Control
and
Countermeasure
(
SPCC)
requirements
in
40
CFR
112.7(
e)(
2)(
iii)],
may
be
discharged
without
treatment
and
only
annual
monitoring
for
flow,
oil
and
grease,
total
BETX,
and
PAH's.
The
main
criterion
is
that
the
wastewater
cannot
contain
a
visible
oil
sheen
or
film,
in
which
case
it
would
comply
with
the
15
mg/
L
limit
for
oil
and
grease.
Wastewater
that
does
not
meet
the
criteria
must
be
treated
and
monitored
as
specified
in
Table
1
or
Table
2.

(
3)
Treatment
System
Usage
Restrictions:
Treatment
system
equipment
can
only
be
used
for
treatment
of
petroleum
product
contact
water.
Facilities
that
use
treatment
equipment
for
other
purposes
will
not
be
able
to
meet
permit
requirements.
For
example,
if
an
oil/
water
separator
is
used
to
store
waste
oils
and
spills,
any
contact
water
entering
the
oil/
water
separator
would
result
in
the
discharge
of
oil
and
grease
in
exceedance
of
permit
limits.

(
4)
Treatment
System
Inspection
and
Maintenance:
Inspection
and
maintenance
of
treatment
equipment
is
at
least
as
important
as
analytical
monitoring
of
the
discharge.
Treatment
equipment
must
be
operating
effectively
and
efficiently
to
insure
that
permit
limits
are
met.
This
can
only
be
accomplished
through
regularly
scheduled
maintenance
and
cleaning.

(
5)
Disposal
of
Sludges
and
Solids
Removed
from
Treatment
Systems:
Documentation
of
waste
oil
and
grease
disposal
from
the
treatment
system
and
the
facility
will
provide
information
as
to
the
cleanliness
of
the
operation,
and
that
wastes
are
properly
disposed
of.
Large
amounts
of
waste
oil
and
grease
for
disposal
may
indicate
excessive
spills,
dumping,
and
possible
discharges
of
oil
that
may
not
be
identified
by
analytical
monitoring.

(
6)
Reporting
of
Tank
Bottom
Water
Disposal:
Facilities
regulated
by
this
GP
that
do
not
discharge
tank
bottom
water
to
surface
water
or
groundwater
are
required
to
report
where
they
dispose
of
this
wastewater.
Instead
of
treating
and
discharging
tank
bottoms,
facilities
may
decide
to
dispose
of
the
wastewater
by
hauling
to
sewage
treatment
plants,
hauling
to
refineries,
or
by
other
means.
Since
tank
bottom
water
contains
hazardous
pollutants,
it
is
appropriate
that
all
facilities
regulated
by
this
GP
report
to
the
Department
where
this
water
is
being
disposed.

(
7)
Test
Methods:
The
permit
specifies
the
test
methods
that
shall
be
used
for
analyzing
parameters
associated
with
discharges
covered
by
this
GP.
The
Department
may
approve
an
alternate
test
method
as
long
as
it
provides
accurate
results
and
has
a
level
of
detection
that
is
similar
to
the
method
specified
in
the
permit.
If
the
facility
wishes
to
use
an
alternate
method,
it
must
be
approved
by
the
Department
in
writing
prior
to
use.
­
5
­
(
8)
Dikes
and
Berms:
Leakage
through
dikes
must
be
prevented.

C.
REQUIREMENTS
FOR
GROUNDWATER
DISCHARGES
A
discharge
to
groundwater
in
Wisconsin
includes
wastewater
infiltration
from
irrigation,
drain
fields,
ditches,
and
absorption
ponds.
The
effluent
quality
is
regulated
to
prevent
negative
impacts
to
the
water
beneath
the
ground
surface.
Table
1
in
the
permit
lists
the
discharge
limitations
and
monitoring
requirements
for
groundwater
discharges
for
three
categories
of
petroleum
contaminated
wastewater.
The
monitoring
parameters
consist
of
the
following:

1.
Petroleum
Contact
Water
(
excluding
tank
bottom
water)

Flow:
An
estimate
of
the
average
daily
flow
performed
quarterly
will
be
sufficient
to
assure
that
the
facility
is
aware
of
the
discharge
amount.
An
estimate
means
a
reasonable
approximation
of
flow
based
on
any
of
the
following:
(
a)
water
balance,
(
b)
an
uncalibrated
weir,
(
c)
calculations
from
the
velocity
and
cross
section
of
the
discharge,
(
d)
intake
water
meter
readings
where
the
intake,
or
a
specific
portion
of
it,
is
discharged,
(
e)
discharge
water
meter
readings,
and
(
f)
any
of
the
more
complex
methods
listed
in
s.
NR
218.05(
1),
Wis.
Adm.
Code.
The
Department
may
approve
additional
methods
for
estimating
flow.

Oil
and
Grease:
Wastewater
contaminated
with
free
petroleum
product
can
be
discharged
to
seepage
areas
after
removal
of
the
free
petroleum
product.
The
oil
and
grease
daily
maximum
effluent
limit
is
15
mg/
l,
which
is
a
treatment
technology
based
limit
that
reflects
the
ability
of
simple
oil/
water
separation
equipment
to
easily
remove
oil
and
grease
from
the
discharge.
Oil
and
grease
monitoring
is
required
on
a
quarterly
basis
using
a
grab
sample.

Total
BETX
and
Polynuclear
Aromatic
Hydrocarbons
(
PAH's):
These
are
parameters
requiring
only
monitoring
on
an
annual
basis
using
a
grab
sample.
Monitoring
for
these
parameters
is
designed
to
gather
information
on
their
levels
in
discharges
covered
under
this
permit.
These
compounds
are
usually
only
associated
with
the
tank
bottom
water.
Limits
are
not
included
for
the
BETX
compounds
(
benzene,
ethylbenzene,
toluene,
and
xylene)
because
they
should
be
at
concentrations
below
levels
of
concern,
and
there
no
groundwater
standards
currently
in
place
for
PAH's.

2.
Tank
Bottom
Water
Flow,
Oil
and
Grease,
and
PAH's:
These
parameters
are
monitored
the
same
as
the
petroleum
contact
water
described
above.

Benzo(
a)
pyrene,
Naphthalene,
Benzene,
Ethylbenzene,
Toluene,
and
Total
BETX:
Monitoring
for
these
parameters,
which
are
found
in
petroleum
products,
is
required
on
a
quarterly
basis
using
a
grab
sample.
Water
that
may
collect
at
the
bottom
of
a
petroleum
storage
tank
is
subject
to
long
term
exposure,
causing
it
to
become
contaminated
with
dissolved
or
emulsified
petroleum
products.
The
discharge
limitations
are
based
on
the
Preventive
Action
Limits
(
PAL's)
contained
in
ch.
NR
140,
Wis.
Adm.
Code.
Setting
the
discharge
limitations
at
the
PAL's,
and
expressing
them
as
daily
maximum
limits
is
designed
to
ensure
groundwater
standards
are
not
exceeded.
The
BETX
components
are
monitored
individually
except
for
xylene.
A
Total
BETX
limit
of
750
µ
g/
L
will
apply
as
a
treatment
technology
based
limit.

3.
Scrap
and
Waste
Storage
Area
Oily
Water
Flow,
Oil
and
Grease,
PAH's,
Benzo(
a)
pyrene,
Naphthalene,
Benzene,
Ethylbenzene,
Toluene,
and
Total
BETX:
These
parameters
are
monitored
the
same
as
the
tank
bottom
water
described
above.

Total
Suspended
Solids:
Solids
may
be
a
contaminate
in
the
storm
water
runoff
that
enters
scrap
and
waste
storage
areas,
so
it
was
added
as
a
potential
parameter
of
concern.
Included
is
a
treatment
technology
based
limit
of
40
mg/
L
expressed
as
a
daily
maximum.
­
6
­
In
addition
to
the
discharge
limitations
and
monitoring
requirements
in
Table
1,
there
is
one
condition
related
to
the
operation
of
the
treatment
systems.

(
1)
Solids
Removal:
Occasional
removal
of
solids
from
seepage
areas
is
necessary
to
insure
that
these
areas
can
continue
to
absorb
wastewater.
Solids
in
wastewater
can
cover
soils
and
clog
spaces
between
soil
particles,
resulting
in
decreased
seepage
capacity.

D.
REQUIREMENTS
FOR
SURFACE
WATER
DISCHARGES
Surface
water
discharges
include
ditches,
storm
sewers
and
pipes
that
convey
wastewater
to
creeks,
streams,
rivers
and
lakes
in
Wisconsin.
The
effluent
quality
is
regulated
to
prevent
negative
impacts
to
surface
water.
Table
2
in
the
permit
lists
the
discharge
limitations
and
monitoring
requirements
for
surface
water
discharges
for
three
categories
of
petroleum
contaminated
wastewater.
The
previous
permit
made
a
distinction
between
public
water
supply
and
non­
public
water
supply
receiving
waters.
This
has
been
eliminated
because
the
general
permit
typically
is
not
issued
to
discharges
to
public
water
supplies.
The
limits
are
also
treatment
technology
based,
not
water
quality
based.
If
a
surface
water
needs
protection
beyond
the
general
permit,
an
individual
permit
with
site
specific
limits
must
be
issued.
The
monitoring
parameters
consist
of
the
following:

1.
Petroleum
Contact
Water
(
excluding
tank
bottom
water)

Flow,
Oil
and
Grease,
and
PAH's
and
Total
BETX:
These
parameters
are
monitored
the
same
as
the
petroleum
contact
water
in
Table
1
described
above
in
Section
C.

Biochemical
Oxygen
Demand
(
BOD5):
This
parameter
is
monitored
annually
to
gather
information
on
BOD5
levels
in
discharges
to
surface
water.
This
monitoring
is
not
applicable
to
groundwater
discharges.

2.
Tank
Bottom
Water
Flow,
Oil
and
Grease,
PAH's,
Total
BETX,
and
BOD5:
These
parameters
are
monitored
the
same
as
the
petroleum
contact
water
described
above.
Because
contamination
may
be
more
likely
for
the
tank
bottom
water,
included
are
treatment
technology
based
limits
of
0.1
µ
g/
L
for
PAH's
as
a
monthly
average,
and
750
µ
g/
L
for
Total
BETX
as
a
daily
maximum.
Because
the
concentration
limit
for
total
BETX
is
high
and
should
be
met,
the
limit
is
expressed
as
a
daily
maximum
to
be
more
protective
than
a
monthly
average.

Benzo(
a)
pyrene
and
Benzene:
In
addition,
these
two
parameters
were
added
as
petroleum
contaminant
indicators
for
the
tank
bottom
water.
Included
are
treatment
technology
based
limits
of
0.1
µ
g/
L
for
benzo(
a)
pyrene
and
50
µ
g/
L
for
benzene,
which
are
both
expressed
as
a
monthly
average.

3.
Scrap
and
Waste
Storage
Area
Oily
Water
Flow,
Oil
and
Grease,
PAH's,
Total
BETEX,
Benzo(
a)
pyrene,
Benzene,
and
BOD5:
These
parameters
are
monitored
and
limited
the
same
as
the
tank
bottom
water
described
above.

Naphthalene
and
Total
Suspended
Solids:
These
parameters
were
added
as
potential
substances
of
concern.
Included
are
treatment
technology
based
limits
of
70
µ
g/
L
for
Naphthalene
as
a
monthly
average,
and
40
mg/
L
for
total
suspended
solids
as
a
daily
maximum.
Because
the
concentration
limit
for
total
suspended
solids
is
high
and
should
be
met,
the
limit
is
express
as
a
daily
maximum
to
be
more
protective
than
a
monthly
average.

In
addition
to
the
discharge
limitations
and
monitoring
requirements
in
Table
2,
there
is
one
condition
related
to
the
operation
of
the
treatment
systems.
­
7
­
(
1)
Floating
Solids
and
Foam:
This
is
a
Best
Professional
Judgment
(
BPJ)
condition
dating
back
to
the
Refuse
Act
Permit
Program
and
the
Corps.
of
Engineer's
River
and
Harbor
Act
of
1899.
This
condition
is
achievable
by
application
of
best
practicable
control
technology.

E.
STANDARD
REQUIREMENTS
These
requirements
apply
to
all
permittees,
and
reflect
the
general
conditions
contained
in
ch.
NR
205,
Wis.
Adm.
Code.
They
consist
of
permittee
obligations
and
reporting
requirements.

CHANGES
FROM
THE
PREVIOUS
GENERAL
PERMIT
REISSUANCE
The
substance
of
the
permit
remains
same
similar
to
the
current
permit.
Revisions
where
made
where
necessary
to
clarify
or
reflect
changes
to
administrative
codes.

The
discharge
limits
for
toluene
and
xylene
were
changed
from
the
previous
permit
to
reflect
revisions
to
the
ch.
NR
140,
Wis.
Adm.
Code,
groundwater
standards
the
permit
limits
are
designed
to
protect.
The
toluene
limit
is
proposed
to
be
increased
to
200
µ
g/
L.
The
xylene
groundwater
standard
increased
from
124
µ
g/
L
to
1000
µ
g/
L,
which
is
higher
than
the
treatment
technology
based
limit.
Consequently,
where
xylene
was
previously
limited,
it
was
replaced
with
monitoring
for
total
BETX
and
a
treatment
technology
based
limit
of
750
µ
g/
L.

A
new
wastewater
category
was
added
to
the
permit
to
cover
"
scrap
and
waste
storage
area
oily
water",
which
may
significantly
contaminate
storm
water
with
petroleum
products.
Previously,
the
permit
covered
petroleum
contact
water
and
tank
bottom
water.
The
"
scrap
and
waste
storage
oily
water"
didn't
fit
well
into
either
of
these
categories.
This
type
oily
water
is
often
associated
with
scrap
metal
recycling
yards.
The
general
permit
needed
to
clearly
state
that
these
facilities
could
be
covered
under
this
general
permit.
Because
this
oily
water
may
be
contaminated
similar
to
both
the
petroleum
contact
water
and
tank
bottom
water,
the
requirements
for
it
are
a
composite
of
the
two.
Separate
sections
in
Tables
1
and
2
list
the
monitoring
requirements
and
limits
for
this
category
of
wastewater.

A
change
was
made
to
the
applicability
criteria
in
Section
A(
2)(
g)
relating
to
the
21
bioaccumulators.
Previous
permit
language
excluding
discharges
from
coverage
under
this
GP
for
"
containing"
any
of
the
21
bioaccumulators
has
been
changed
to
exclude
discharges
"
adding
detectable
quantities"
of
any
of
the
21
bioaccumulators.
The
list
of
21
bioaccumulators
included
in
the
previous
permit
has
been
changed
to
reflect
the
current
list
as
defined
by
the
Great
Lakes
Initiative
(
GLI­
Federal
register
dated
March
23,
1995).
Updates
to
the
list
added
delta
BHC,
4'
4'­
DDD,
4'
4'­
DDE,
Mirex,
Photomirex,
Hexachlorobutadiene,
Octacholorostyrene,
and
1,2,3,4
Tetrachlorobenzene.
Removed
from
the
list
were
Acrolein,
Tech.­
BHC,
3,3'­
Dichlorobenzidine,
Endosulfan,
Endrin,
Fluoranthene,
Heptachlor
and
2,4,6­
Trichlorophenol.

Attachment:
Permit
Monitoring
Requirements
Tables
1
and
2
­
8
­
Table
1
Limitations
for
Groundwater
Discharges
Monitoring
Requirements
Parameter
Daily
Maximum
Sample
(
a)

Frequency
Sample
(
b,
c)

Type
Petroleum
Contact
Water
(
excluding
tank
bottom
water)

Flow
­­
Gal/
Day
Quarterly
Estimate
Oil
and
Grease
15
mg/
l
Quarterly
Grab
Total
BETX
(
d)
­­
mg/
L
Annually
Grab
Polynuclear
Aromatic
Hydrocarbons
(
PAH's)
(
e)
­­
µ
g/
L
Annually
Grab
Tank
Bottom
Water
Flow
­­
Gal/
Day
Quarterly
Estimate
Oil
and
Grease
15
mg/
L
Quarterly
Grab
Benzo(
a)
pyrene
0.02
µ
g/
L
Quarterly
Grab
Naphthalene
8
µ
g/
L
Quarterly
Grab
Benzene
0.5
µ
g/
L
Quarterly
Grab
Ethylbenzene
140
µ
g/
L
Quarterly
Grab
Toluene
200
µ
g/
L
Quarterly
Grab
Total
BETX
750
µ
g/
L
Quarterly
Grab
Polynuclear
Aromatic
Hydrocarbons
(
PAH's)
(
e)
0.1
µ
g/
L
Annually
Grab
Scrap
and
Waste
Storage
Area
Oily
Water
Flow
­­
Gal/
Day
Quarterly
Estimate
Oil
and
Grease
15
mg/
L
Quarterly
Grab
Polynuclear
Aromatic
Hydrocarbons
(
PAH's)
(
e)
0.1
µ
g/
L
Quarterly
Grab
Benzo(
a)
pyrene
0.02
µ
g/
L
Quarterly
Grab
Benzene
0.5
µ
g/
L
Quarterly
Grab
Ethylbenzene
140
µ
g/
L
Quarterly
Grab
Toluene
200
µ
g/
L
Quarterly
Grab
Total
BETX
750
µ
g/
L
Quarterly
Grab
Naphthalene
8
µ
g/
L
Quarterly
Grab
Total
Suspended
Solids
40
mg/
L
Quarterly
Grab
­
9
­
Table
2
Limitations
for
Surface
Water
Discharges
Monitoring
Requirements
Parameter
Monthly
Average
Sample
(
a)

Frequency
Sample
(
b,
c)

Type
Petroleum
Contact
Water
(
excluding
tank
bottom
water)

Flow
­­
Gal/
Day
Quarterly
Estimate
Oil
and
Grease
15
mg/
l
(
d)
Quarterly
Grab
Polynuclear
Aromatic
Hydrocarbons
(
PAH's)
(
f)
­­
µ
g/
L
Annually
Grab
Total
BETX
(
e)
­­
µ
g/
L
Annually
Grab
BOD5
­­
mg/
L
Annually
Grab
Tank
Bottom
Water
Flow
­­
Gal/
Day
Quarterly
Estimate
Oil
and
Grease
15
mg/
L
(
d)
Quarterly
Grab
Polynuclear
Aromatic
Hydrocarbons
(
PAH's)
(
f)
0.1
µ
g/
L
Quarterly
Grab
Benzo(
a)
pyrene,
0.1
µ
g/
L
Quarterly
Grab
Benzene
50
µ
g/
L
Quarterly
Grab
Total
BETX
(
e)
750
µ
g/
L
(
d)
Quarterly
Grab
BOD5
­­
mg/
L
Annually
Grab
Scrap
and
Waste
Storage
Area
Oily
Water
Flow
­­
Gal/
Day
Quarterly
Estimate
Oil
and
Grease
15
mg/
L
(
d)
Quarterly
Grab
Polynuclear
Aromatic
Hydrocarbons
(
PAH's)
(
f)
0.1
µ
g/
L
Quarterly
Grab
Benzo(
a)
pyrene
0.1
µ
g/
L
Quarterly
Grab
Benzene
50
µ
g/
L
Quarterly
Grab
Total
BETX
(
e)
750
µ
g/
L
(
d)
Quarterly
Grab
Naphthalene
70
µ
g/
L
Quarterly
Grab
Total
Suspended
Solids
40
mg/
L
(
d)
Quarterly
Grab
BOD5
­­
mg/
L
Quarterly
Grab