\
eft
ENGINEERING
TECHNICAL
FIELD
INFORMATION
TECHNICAL
NOTES
DATA
RETRIEVAL
REPORTS
TEXTS
CURRENT AWARENESS
SYSTEM
PPIP
Notes
Field
Distribution of Culvert
Camber
Joints
Visual Aids for Compaction
Bridging the
Wet Spots
Advanced Technical
Training Program
Washington Office Engineering News
FOREST SERVICE
U.S.
OCTOBER
DEPARTMENT OF AGRICULTURE
1975
ýI.
ENGINEERING FIELD NOTES
This
publication
The
Forest
text
This
The
exchange
to
technical or administrative
must
the
monthly
is
not
not
be
is
construed
of
type
nature
Department
interpretation
or
of
the
in
each
read
the
by
except
publication
issue
or
FSM
all
however
exclusively for engineers.
published
for distribution
this
Service and
no
assumes
Agriculture
use
as
of
opinions
recommended
or policy
material
should
Department of Agriculture-Forest
of
personal
instructions
technicians
intended
newsletter
the
represents
mandatory
of
Because
publication
U.S.
and
and engineering
engineers
the
publication
procedures
references.
this
the
author
approved
a
published
Service personnel.
in
respective
newsletter
and ideas of
information
engineering
among
monthly
a
is
information
employees of
to
its
retirees
responsibility
by
other
only.
the
for
than
its
own
employees.
The
use of trade firm or corporation
convenience
evaluation
any product
of
the
reader.
conclusion
or service
Such
use
names
is
does
not
recommendation
to
the exclusion
for
the information
constitute
endorsement
of others
or
an
official
approval
which may be
and
of
suitable.
CAMBER TO THE
DISTRIBUTION OF CULVERT
JOINTS
Jim Rousey
Engineering Technician
Siuslaw
National
Forest
Region 6
When
placing
culvert
to
Since
line.
camber
under high
culverts
must
be
Obtaining camber
of
bend
at
normally necessary
is
being
must often be quite loose
a
and
been developed
chart has
following
are approximately the
culvert sections
It
joints.
required
not
differ
of the
in
distance
the
with
the culvert
frequently
is
resulting in
such
at
joints
which can contribute
to
camber
to
proportion
by more than four
length
when
The bands
the total
which the culvert
in
recommended
is
culvert
fill.
installation
It
apart.
the
the flow
capability
the
especially
bend
uniformly
to
a sag
in
joint.
difficult
can be used on any
same
in
often inadequate
those joints and possible failure
each of the culvert
prevent
curve
gentle
camber
to
bending
only one or two joints.
at
allow for the
to
is
to
a limited
each banded
the culvert bed
applied
has
can be
during construction
most of the camber
at
produce
to
applied
eye balling
long. Merely
The
it
CMP
metal pipe
corrugated
approximately equal amounts
leakage
fills
allow for future settlement of the foundation
that
the
joints
individual
feet.
CAMBER FACTOR
No.
of
Secs
of
At Upper
CMP
Outlet
End
2
1
of
CMP
Section
4
3
5
7
6
8
2
0.00
1.00
3
0.00
1.00
1.00
0.00
4
0.00
0.75
1.00
0.75
0.00
5
0.00
0.67
1.00
1.00
0.67
0.00
6
0.00
0.56
0.89
1.00
0.89
0.56
0.00
7
0.00
0.50
0.83
1.00
1.00
0.83
0.50
0.00
8
0.00
0.44
0.75
0.94
1.00
0.94
0.75
0.44
0.00
9
0.00
0.40
0.70
0.90
1.00
1.00
0.90
0.70
0.40
0.00
INSTRUCTIONS
1.
Determine
2.
Divide
3.
Determine
4.
5.
Multiply
by
total
no.
total
camber
Add camber
rise
of
of secs
amount
by
CMP from
of
CMP
to
for
rise
outlet
to
compute
of camber
factor
for section
9
inlet.
rise
engineers
upper end
for that
of
at
end
of
each
section.
judgement.
each
section
section
to
determine camber
determine cambered
to
1
rise
for that
for that
section.
section.
0.00
The
total
amount
consideration
the
so
nd depth to rock
generally not less t
The
determined
is
flow line gradient
supporting
inlet
connecting
camber
of
of the
/2 of
a
and
1%
1.
Rise of culvert
2.
Number
height
stratum.
or supporting
of the total
length
how
chart
from outlet to
of sections
a.
Rise per
b.
Culvert
of
section
feet
Rise
is
used.
sections
From
Outlet
to
5.
2 feet
per section
Upper
End
2
4
3
6 feet
of Section
feet
8 feet
10
1
Total
feet
foot
Camber
Camber
Camber
Factor
Rise
1
1
x
0.67
2
1
x
1.00
1.00
3
1
x
1.00
1.00
4
1
x
0.67
0.67
5
1
x
0.00
0.00
Culvert
Section
1
2
3
4
5
Rise from Outlet
to
Upper
Camber
End
Rise
0.67
2.00
Total
to
Upper
0.67
Rise
from Outlet
End
Incl.
2.67
5.00
4.00
1.00
6.00
1.00
7.00
0.67
8.67
8.00
0.00
10.00
2
on
of
camber
2 feet
Camber
Section
total
5
5
5
4.
The
10 feet.
inlet
culvert
10
Section
the
4
Total
based
aracteristics
c
of culvert above the straight
1
3.
a tent
jud
of fill compressive
outlet.
example shows
following
by engineering
10.00
Camber
is
line
VISUAL AIDS FOR COMPACTION CONTROL
W.
Leland
Sperry
Engineering Technician
Materials
Forest
Allegheny National
9
Region
Compaction of
Mr.
R.
R.
moisture
also
is
showed
that
and the degree
content
showed that
one
long been a critical
has
soils
Proctor
moisture
a specific
for
there
factor in highway construction.
a
is
definite
of dry density to which a soil
amount
of compactive effort
content
on the soil and second
field
as
making
density to laboratory density
a field
applied
density
laboratory
test
density
after
Mr.
obtained.
is
compaction
The
compaction.
termed relative compaction and
is
soil
the soil there
to
standard
Proctors findings are applied
the
may be compacted. He
maximum
optimum at
by first making a
which
1933
In
between
relationship
is
test
ratio
of
always given
a percentage.
The
original
ASTM
Spec.
standard
698-70.
years but the same
Proctor
test
now
is
been
principle has
defined
AASHTO
by
Spec.
T99-74
of this test have been developed
Several modifications
utilized
in
and
recent
each modification.
with
encoun-tered
Since
optimum
the
natural
moisture
the
Much
National
optimum by
major problem
content
for
time and
of
a soil
of the soil in the field
identifying that
in visually
on the Allegheny
exceed
moisture
content
optimum
Forest the
ten percent
or greater.
have been wasted
vary
several
has
a problem
moisture
natural
our inspection personnel
effort
may
value
moisture
This
contents
and the involved
of the
Here
soils
may
always presented
contractors
a
personnel.
materials
compact
to
been
during construction.
difference has
attempting
from the
percent
always
that
were
just too wet.
Many
of our soils on this Forest
than they do when
observed
they
have a different appearance
wet or dry. False
are excessively
at
Many
and improper control values have been used unawarely.
problems have occurred
For the past
1-11/2
because of
moisture-density
control curve
moisture
have been
construction
deficiency.
this
years a new method
been successfully used on the
optimum
identifications
ideal
for identifying
Allegheny.
During
the
laboratory
for a soil a sample of the
3
moisture
known
content
preparation
moisture
has
of the
content
has
been retained
a transparent
in
sample was purposely
optimum
moisture
contractors
is
to
bagged
desired
make
necessary for easy compaction.
person
can
sample and
The
select
moisture-proof
marketed
Nasco
by
Whirl-Pak.
half
approximately
is
seal.
moisture-proof
months and
with
bag
the plastic
puncture
soil
detected
loss
been caused
by an improper
all
loss
is
to
and handling
have
can
if
an
these
been
this
bags
18-oz.
name
brand
the
several
in
of
After the bag
times
form
to
manner
for
a
several
the bags are used and stored
From
and
do
accomplish
initial
of less than
loss
is
the
affected
of the
upon
initial
the
its
work.
may
rate
characteristics
that
moisture content
the
initial
a
be
the
seal of the
loss
is
An
and recording
by weighing
the
initial
at
let stand
24 hours
for
it
they
help
in
means
better
Both parties have a quick
4
if
or the
new
desired.
a
making the decision as
much more uniform and
information
more
the samples have
instances
uniformity
and used
operations the sample bags have been
viewpoint
contractor
In some
loss
not
over
any future time therefore the moisture
equal weight of water may be added to the bag
weight
content
compaction.
Most
is
occur
to
The moisture
loss.
test. In most cases this ensures
To
Contrasting
only 0.4%.
polyethylene
definite
sample and
moisture
the
Since
by several
composition the
size
lost
the
may have
are properly managed.
inspectors
to
result.
this
their
2%.
a
loss
preparation.
has
and
loss
This
can be expected
loss
be monitored
easily
moisture
when
economical end
to
the
for ten months
both inspection and contractors
useful.
where
in
for moisture
months.
of the sample can be readily calculated
content
Considering
when
can
bag sample and
attain the original
quite
influence
a significant problem.
never
seal
loss
soil
the
characteristics
of moisture
of the
moisture
to
each sample. The
of storage
minimized
to
bag
transparent
to escape.
fourteen
moisture
a slight
does appear that the
It
common
method
loss
when
With more monitoring experience
of time.
established.
The
whirled
is
after
sample monitored
another
absolutely moisture-proof
weight
have
under
been monitored
of the samples monitored have shown a
bag
it
moisture
been 4.5%
has
however
sample
with this
allowing the
our samples have
of
percent
maximum
are
Wisconsin
has been very slight
loss
the
curves.
wires and tape framing the opening.
the
moisture
at room temperature when not being used in the field. Some
when handling the samples because sharp-edged fragments may
care has to be taken
period
with
have retained samples prepared
the moisture
with that
well as the inexperienced
as
procedure
this
Atkinson
Fort
full
We
in
generally be the
the field by our inspection
to
contents
control
Although
level.
steel cabinet
properly
Twelve
of
bag has double
This
moisture
used
bags
plastic
reference. This
will
of the field moisture
The experienced
workable
moisture-density
proper
above optimum
been taken
has
a visual comparison
identify
future
for
near optimum moisture content
at
content
quickly
bag
plastic
the field slightly
in
The bagged sample
choice.
people and used
moisture-proof
on
accurate
answered
the
how
and
means
to
question
should we
to
try
convinced
contractors
obtained
simply
construction
without
testing
that
on the basis of comparing
project control.
If
actual
construction
has
a sample not previously encountered
This
in
is
in
new
identifying the
not an endorsement for
the field.
the
The
specified
material
in
Forest
has
successfully
density can or cannot be
sample bags
to
on the
that
site.
Generally the sample bags are prepared
very helpful
today
embankment
construct
A
similar plastic
in
advance
begun and
on a
specific
of construction
it
for purposes
becomes necessary
project
the bag
to
of
evaluate
samples become
soil.
Nasco
or
bag of equal
5
Whirl-Pak
but a description of
quality would produce the
same
its
use
results.
BRIDGINGTHE WET SPOTS
Durray Dailey
Forest
Engineer
Sierra National
Forest
5
Region
Trail crossings
through
1. The
result
mudholes
easily
to avoid
Several
on
Engineer
the
would provide
The
wet areas.
The
replaced.
the
in
liners were
fiberglass
A
was made near Elkhart
Wilderness
through
an
They
Bridger
a
designed
were
natural
Forest
respectively
made
trail liner
the
impeding
flow
4
Region
for
of fiberglass
of water
liners
place see
fig.
of the liner
3.
as
that
through
see
fig.
2. Log
two
to
in
be manufactured
in
the Sierra National
some beige-color
of
the
to
mold.
Wildernesses.
This
31/2
feet
needing
trail
is
be
feet
difficulty.
and curved
surface
the liners in
on top of the
placed
to
wide and 6
of the liners without
on top of the
the
trails
flat
portion
4.
the trail users view
The
trail liners.
without
sections
feet
see
of colors to blend in with
a variety
corduroy. The sections were
Miarets
lies
in
into the
that
for constructing
poles are set under the ridges to hold
cost was
See
figs.
$35 for each
figure
installed
7
detailed
on several
summer Forest
trails
5 and
6. The
different soil types.
with a local fiberglass
Forest negotiated
original
100 linear
three inches of soil
figure
Only the ridges are exposed
to
trails
proved
test
of use
years
five
This
method
economical
which
Then
shown
Forest.
are fabricated
80
of a flat section
consists
National
have withstood
trail liners
fiberglass
Park on one of the main access
and
effective
pack animal can transport
ridges on both sides
cost
be used.
will
Trail Coordinator
and
Forest
and cannot be
areas.
Bridger
The
National
The two men
a dry trail tred without
first trial
long.
who
Housley and Jim Wise
Bridger
a better idea.
developed
boggy
Donald
ago
years
where they
site to
to build
fig.
The
of natural
walkways
these
from the construction
transported
see
and damage to protective vegetation.
problems has been to construct
materials above the wet zones. These structures are expensive
way
standard
crews. These moist
use by horse and foot traffic
under repeated
water pollution
erosion
is
a high water
other areas with
hikers and trail maintenance
table have always been a problem to
areas quickly turn into
meadows and
mountain
high
fabricator
six-foot
section
drawing
leading
of
can
Last year
to manufacture
including
fiberglass
into the John
Service employees will observe
6
liners
the
trail
Muir and
trail
users
the test sections
the fiberglass
trails as
ordering
liners
a means
anticipated
determine the reaction
these tests
pass
in
for
they will be installed
the
trail liner
sections
along
J
Y..
reducing
I
$w
t
4
significantly
tflr
a
J
S
U
ý
I
a
s
a
ý
Figure
1.-Site
Figure
y
ý
7
trail
Z
1
ýý
ray
dý
ý
selected for liner to
2.-Fiberglass
fJ
be
tread
rf
installed.
liner.
It
is
reduced by
i
ý S
yy
wilderness
erosion.
larger quantities.
ýfM1Y
a
be
will
by
new method.
widely
and
trails
are eliminated
trails
of trail users to the
wet and muddy
of eliminating
that unit costs
them
wet spots on the
r
If
if the
I
the liners and to
determine
to
I
crossing
ý
unnoticeable.
making
8
almost installation
edge
outside
up grow will vegetation
against
time
6.-In
Figure
1t
use.
Ow.
141
-
liner.
of part
flat
on laced p 4.-Cushion
i
for ready
section
5.-Completed
-
Fr
gýx
Figure
Wiz
Figure
0
cushion.
or two-
of placing
installed liner tread
-
_
Hn
three-inch
for ready
trail
and
3.-Fiberglass
Figure
At
pr.
yS92
ý
rý
ý
ýý
pax.
fat
WATERBAR
SECTION
C9
COLOR-BEIGE
/
In
1/8
PLAN
SIDE ELEVATION
NO SCALE
NO SCALE
TURNPIKE
SECTION
COLOR-BEIGE
io
tv
io
I
5-11-3/4
-
END ELEVATION
PLAN
SCALE
NO
Figure
7.-Detailed
-I 4
NO
drawing of fiberglass
9
trail
corduroy.
SCALE
ADVANCED TECHNICAL TRAINING PROGRAM
R.
number
This year the
Deleissegues
Recruitment
Technical
and Development
selected for the Transportation
of candidates
meet the increasing demand
order to
in
Systems Analysis
and Layout Program was substantially
Program and the Logging Systems Planning
increased
Engineer
for
with
personnel
skills
in
these
fields.
The
California
The Program
Berkeley.
at
Analysis and the second
core subjects
With
included
that
and Wildland
In addition
Engineering
there
Engineering.
It
Analysis option
same
for
is
there
Analysis
City and
recommended
that
in
preparation
in
our
The
experience
candidates
and
Program
in
Corvallis
objectives
Basically
Oregon
6
in
role
and
studying
this
length
a
on
the
logging
the
impact
two-year
of the total
upon the needs
the
systems and the requirements
from Region
the
essentially
Changes
according
to
in
their
of
logging
Region
in
practices
State
on
other
nine
of
of planned
on-the-job
his
Forest
10
vary
for
in
engineering
of
silvicultural
forest
months
values.
of
formal
development.
each participant
past training and experience
Service.
Dave
University
logging
consisting
will
5
8.
accomplishment
in
engineer
Systems Analysis
from Region
Oregon
at
skills
strengthening
program
months
of the
Civil
Transportation
is
Transportation
and Bob Sutton
Lewis
training program
of his sponsoring
and
and training has included
be considered
will
for the
Clapham
and Charlton
studies and fifteen
graduate-level
actual
is
of
Budgeting
follow
Program
Operations
courses.
September
Alfred
concentrates
the
Traffic
the core subjects
The Logging Systems Planning and Layout Program
developing
With
education
that field. Course work
that enrolled
and
are available.
order to maintain the objectives of the program.
Program are Ted Berkebile
have
Policy
and
Research
candidates
previous
and undergraduate
Nordegren from Region
major options
the
Statistics.
these programs that are proposed by the students
previous
Transportation
Transportation
Operations
and
Research
Operations
unless an individuals
both options
are
Planning
Regional
are
of
University
and Planning.
within
subjects
is
Systems Analysis
Characteristics
Probability
Economics
alternative
Transportation
significant
of
the
at
first
Both study options
Engineering.
Stream
Traffic
Resource
the core
to
Budgeting
Traffic Operations
is
offered
is
two options the
includes
Engineering Concepts
Transportation
Planning
Program
Systems Analysis
Transportation
The
depending
in
logging
The
objective of this Program
logging
starting
is
programs with
sales
5
and
relationships
2
3
guidelines
and
for
4
efficiently
train others
to
to solve
guidelines for
develop
do the job
to
1
capabilities
to
to prepare
systems
logging
differing
of these systems using the latest technology
understand cost and production
to
develop
skills.
The core subjects
Mechanics
Systems
Technology
This
participants
and existing sales
systems problems on planned
application
their
the
to develop
Forest
in
September
in
the
academic
Road
Analysis and Advanced
Engineering
candidates
enrolled
in
consist
program
Forest
Systems
Transportation
the following
of the
portion
of Logging
Advanced
Design
Forest
the Logging
Hydrology.
Systems Planning
and Layout Program Bob McRae and Ed Stryker of Region 1 Bob Ohmstede from
Region 2 Tom Ortman from Region 4 Jim Benson of Region 5 and Ron Iff of
Region
6.
Academic
graduate
Accreditation
available under both
student however
advanced
academic
Those interested
Fall
is
in
either
applying
Regions - probably
and
coordinators
as
candidates
in
late
instructions
of these
A
for
Transportation
Analysis
-
Berkeley
Tel
415
Group
Forest
Engineering.
will
be distributed
brief descriptions
information
Systems Planning
Sciences
Attn John
Box 245
486-3624
further
Logging
Odendahl
California
Forest
or as a
toward an
of these programs for the. 1976
provides
For
credit
to
the
of course
contact
the
programs
Systems Analysis Program
Wm.
USFS PO
in
Announcement
- which
applying.
a special student
as
degree
for either
Vacancy
October
Transportation
Attn
programs
can lead to graduate
degree or to an undergraduate
semester are urged to do so.
content
enrollment
Corvallis
FTS
Tel
11
503
Laboratory
Sessions
3200 Jefferson
94701
Layout Program
Way
Oregon 97331
752-4420
or
-4206
FTS
WASHINGTON
NEWS
OFFICE ENGINEERING
OPERATIONS
Harold
Strickland
L.
Assistant Director
ENGINEERING CERTIFICATION PROGRAM
of the Regions and the Washington
Representatives
August 24
The
29 to review
-
the examinations
scoring
The examinations
that
A
Denver Colorado
man-hours
examinations
presently
will
used
be prepared
in
this
answer sheet that can be graded rapidly
methods
will
most
often
be used.
be the
will
These are Roads
answers.
multiple-choice
written
standard
held
are
reduce the
to
as a result
or by machine
by template
accommodate
and
format.
year in multiple-choice
either
need
emphasized the
discussion
Office met in
Engineering Certification Program.
the
first
ones
rewritten
to
Administration Asphalt
Sampling and Testing and Aggregate Base and Surfacing.
and clearly described for the
Performance Requirements JPR will be reviewed
to the
above categories. This information will be issued as a supplement or revision
will
be
to
the
JPR.
For
book
Examination
current JPR
EM-7115-1.
questions
keyed
Job
examinations a passing score
the written
oral
examinations
examinations
at
for
material
for those
Training
the
is
performance
this
may
assignments
The
Forest
additional
who
the
pass
either
Pass
study
is
are noted
on-the-job
training
This
information
for those
immediate
employees
action
is
by the
courses special
be
fail.
supervisor.
scheduled
formal classroom
who
for
will
When
supervisor
details
and
and similar programs.
ee Career Development
Supervisor
and education
as
on the JPR
recommendations
with
required
remedial
Based on review of the
be given information
examinations as well
the
maximum possible
of the
Fail.
or
will
Supervisors
of
responsibility
deficiencies
include
to
Region
which
as
Forest
be 75 percent
performance based on the oral examinations.
strengthening
provided
be scored
will
the
will
uses
t
at
Plan
plan
that will contribute
to
Form
m
6100-2
schedule
to the employees
12
is
required
of
for
eac
em loyee.ý
erT
manner
the
career-and
enhance
his
ari
training
value
to
the Forest
The
Service.
an important part
Career
be met
may
assistance
request
the
at
Forest
and
development
data
the
Supervisor
each
developing
in
in
the
constructing
Region
will
Office will coordinate
a
develop
Service-wide
become
Employee
needs
cannot
training program
training
the lesson plan
plan will include
This
when such
training plans
The Washington
level.
assigned Certification category.
an
in
plan
and
references
and other materials.
of available training courses
lists
uses
Plan.
Development
Forests
of the Certification Program examinations will
results
of the
PRECONSTRUCTION CERTIFICATION
These Regions are developing
are basically the
categories
Office during the
Washington
Region
working
is
provided
is
JPR
material
for
below
and Support
Assistance
Primary Responsibility
Category
Regions 3 and 6
10
Route Location
Region
Surveying
Region 5
Region
8
Road Design
Road Design
Region
1
Region
9
Region
9
Region
1
Computer System
Region 2
Basic
Advanced
RDS
The
certification.
preconstruction
recommended by a task force which met in the
week of May 20. The category on which each respective
items
Region 4
Application
The JPR
are scheduled
Regions
for
programs
use
their
material
into the
new JPR
the
Service-wide
ENGINEERING
SKILLS
An
Skills
Engineering
in
developed
provided
Regions
Region
by Forests
that
and
material
Regional program. This
establish
30
completion by April
completion
the
prior to
will
program
for
Those
review.
1976 and
develop
will
the
such
a smooth
to
process
transition of
new
program.
certification
preconstruction
all
Service-wide
a
certification
existing
process will ensure
to
certification
preconstruction
implementation of
and
be forwarded
INVENTORY PROGRAM
Program
Inventory
which
now
is
operational
2 by Jim Hogan and Al Groven. Input
and
and Regions
hopefully
it
will
records
for
to this
include
has
system
all
been
will
be
Engineering
personnel.
In
addition
programs
providing
to
this
development of
The
to
Regional
facilitate
Inventory
skills
a
means
will
of keeping
improvement
permit
and recruiting within
Offices will furnish the
the
Forest
the
various
13
to the
planning
Service.
necessary forms and instructions
development of necessary input
certification
manpower
in
Inventory
Program.
to the
Forests
TECHNOLOGICAL IMPROVEMENTS
Heyward
T.
Taylor
Assistant Director
In the
16 1975
April
Education
and
and
meters
for
NIOSH.
Health
and
accuracy
American National
Rob Harrison
that
because
requiring
only
SAE
the
that
meter
vehicle
noise
requirements
response
will
SDEDC
for
is
to
meter
with
instrument
preparing
an
NIOSH
the
response times.
a
of sound
list
fast
of
a
suitable
for
Engineers
and
as
meter
response
not
Inc.
slow
as
they are precise
meter
on
slow
that will be acceptable
meters
level
Service field needs. This
list
will
be sent to the
field
as
for
all
soon
as
available.
have obtained
National
copies of the
AC
Transportation
DOT/FAA
This book contains
pertinent
reference
and
be available
will
for the
in
Circular
dated
June
Utility
Air Access
24 1975
ten
and
should
to
copies
Office.
and current information
Forest
the
Advisory
No. 150/5300-4B
be distributed to each Regional
valuable
STANDARDS
Weller
C. R.
will
is
Automotive
The use
Service
levels of vehicles.
noise
CONSULTATION
We
slow
methods. The terms
test
reported
requirements such
weighted
of
in
S1.4-1971.
SDEDC
characteristics
Society
level
contained
meet Forest
not
meters are more than mere descriptors
grossly undermeasure
is
may
minimum NIOSH
meet
accepted
Service
A
list
sound
the
test
Center
Development
for
of Occupational
ANSI
specification
certification
have
only
under
level
general purpose Forest
it
have
would
Health
of
requirements
Institute
for such meters
to criteria
ANSI
Institute
Department
outlining
NIOSH
plan
according
NIOSH
proposal
by the National
Dimas Equipment
and proposed Forest
used with the sound
The
only
A
characteristic.
assessing
they
the
the
Register
a
meters
Under
Standards
of the San
Federal
published
level
reliability
on the proposed
meters
needs
HEW
of industrial sound
certification
Safety
issue of the
Welfare
Service.
Washington
It
is
on
airfields
being converted
Office Technical
to
it
microfiche
Information
be a
format
Center.
14
GPO 896-134