Document OzpLgLLjE3KkNEbEZk59bV85M
I
* EH-1027 ^CV- -'
\
E. I. DU FONT DE NEMOURS S COMPANY
1
ifcoiwQAATxa
V/1LMINGTON, DELAWARE 19898
ENGINEERING DEPARTMENT
July 24, 1981
AR226-2140
CC; A.R. Behnke -PPS-Wasbington Wics A.C. Buston -PPS-Washington Hks P. Thistleton-PTO-Washington Wics H.L. Brooks -BSD E.H. Helmers BSD
I.C. 13-AQ&BE
J. G. I.OSCHIA2Q------
POL-niEK. PRODUCTS DEPAKniEMT WASHIHGTOH WOKSS
PPD - WASHINGTON WOBKS - TCTLON ABB. POU.UTIOB
GROUND LEVEL C-8 COMCEHTBAa'IOHS
In
your April
24,
1981
letter
to
me you
requested
determination of eight-hour emissions froia the TFE Building
time -weighted
(162)
PEP
C-8 concentrations that result Building (163). Subsequent to
from
that
letter
we
elected
to
evaluate
both
and maximum
eight-hour
and
annual mean
I
C~8
concentrations using five two cases for the n?E
years of
emissions.
hourly meteorology 1 is found in
for Parkersburg. examined
your April 24 letter as "After
May
Shutdown"
and
Case
1A
is
.
Case the same as Case 1
except
the two dryer Vent stacks are
15 ft
lower,
representing
the situation before the stacks were extended.
Superimposed
on
the
TPE
dryer
vents
were
C-8
emissions .from the baghouse
FEP area. vents) are
Basic
sum
data
for
these
two vents
(wet
finishing and eoagulator Behnke dated Hay 21,
1981.
I did not include
marized in a letter to me from A. R. the blender pit exhaust because C-8 emission
is
negligible
compared
to the other
Behnke *s
^
sources.' As you suggested, I used 50X of the emission, rates in A. R.
Sg
letter for this study.
o
Stack
and
emission
data
for
both
eight-hour
and
annual data
mean concentrations cover the five-year
ate period
^ o
listed
in Attachment
'1973
A (four pages). to December 31,
Meteorology 1977. Surface
data
are
for
Tarkersburg
and
o
from January 1, mixing heights from Dayton, OH.
Concentrations are computed for each hour and periods at each receptor (a point in space
tfhoernwahvicehragceodncoevnetrraetiiognht-ihsoucor mapnudteadn).nuaAl ll
eight-hour
ttoe
weighted AEL of
averages for
10 g/m3.
the entire five-year period are below the Haskell Laboratory
Tour May
12.
1981
letter
to me
specified
15 locations for which eight-hour and annual Table 1 is a sinamary of the highest" calcu
mean concentrations were lated C-8 concentrations
to be computed. for each of these
15
locations
over
the
five-year period of stack heights
record
for
Case
1
and
Case 1A. To reiterate. stack heights prior to
Case 1 represents current extension of the dryer vent
stacks
on
and
the
Case 1A represents TFE Building. The highest calculated
eight-hour value is
6.9 ug/m3,
at
the
Butacite Office Building (Case 1A).
EID079585
-2-
.
July 24, 1981
;
J. G. Loschiavo
Table 2 is a summary of the highest- one-hour concentrations for each receptor location for each of the five years. Although there 'is no established one-hour Idhnit for C~8, the one-hour values need to be calculated to determine eight-hour and annual -mean concentrations.
The highest eight-hour values are summarized in. Table 3. Hone of the values ex ceeds the Alii, of 10 ug/m3. Comparison with Table 1 indicates that maximum eighthour values are less than half the maximum one-hour values. This is due, of course, to the improbability of identical meteorological conditions persisting from hour to hour.
Annual mean values for each of the five years are summarized in Table 4. There is no annual mean limit for C-8 but annual values at a given location determine long term exposure to C-8 and, as suggested by Paul Thistleton, may be useful in corre lating with organic fluoride blood analyses done on selected plant employees.
Hone of the 15 receptors (except possibly Ho. 15) is downwind of the prevailing (W to SW) wind direction. "For this reason, I have made. additional annual mean
. determinations for a receptor grid of 2400 receptor points located 200 ft apart.
.Maximum annual values for these, runs are summarized in Table 5. As expected, the maximum values are somewhat higher than those determined from the 15 receptor plant network. Concentration contours for 1976, the year which exhibits the highest annual values, are drawn on figures 1 and 2. The maximTM concentrations,
as expected, fall to the northeast of .the plant.
The highest calculated eight-hour "concentrations, .for Case 1 and Case 1A, occur ac Butacite Office Building on June 4, 1977 from 8:00 AM to 4:00 TM. I have computed concentration contours for this period and have attached then'as Figures 3 and 4. These contours represent concentrations at a 2400 point receptor grid with the
points 50 ft. apart. Meteorological conditions for the critical eight-hour period
are listed in Attachment B.
Please note that "ground zero" for all of the concentration plots is a point half
way between the dryer stacks. I have only plotted "worst case" conditions; other
periods can be easily plotted if you so desire.
ENGINEEKJKG SERVICE DIVISION
Air Quality & Hazards Engineering
Kle^.
B.. I. Wevodau
Senior Consultant
RIW:cpr Attach.
EID079586