DSHW-1993-002626 - 0901a0688013ebb8

Michael O. Leavitt
Governor
Dianne R. Nielson, Ph.D.
Executive Director
F. Bumell Cordner
o Jtah
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF AIR QUALITY
150 North 1950 West
Salt Lake City, Utah 84114
[phone]
[phone] Fax
Director [phone] T.D.D.
MEMORANDUM
DSHW TN
1993.11246
Reply to: State of Utah
Division of Air Quality
P.O. Box 144820
Salt Lake City, Utah 84114^820
DAQT-073-93
DATE:
TO:
FROM:
SUBJECT:
''-'•' A
July 12, 1993
Lynn Menlove
Robert Swart
Dispersion Modeling for
Hercules Plant 1 NOTICE OF INTENT (NOI)
for remediation of fluorine cylinders
Modeling Performed by: Hercules
Re: E. Richard Anderson letter dated 10 June 1993
E. Richard Anderson letter dated 30 June 1993
This facility DOES NOT constitute A PSD SOURCE.
Background
Hercules desires to remediate fluorine and tetrafluorohydrazine (N2F4) cylinders by venting them
one-at-a-time with a small explosive charge placed on the valve of each cylinder.
Fluorine is considered an airborne toxic. As such, concentration of fluorine at fenceline cannot
exceed the TLV/100 (16 /ig/m^.
Estimated Emissions
Hercules proposes to remediate 54 fluorine and 10 N2F4 cylinders. The operation would be conducted
in an open field approximately 1265 meters (m) north of the closest Hercules property fenceline.
Fluorine cylinders will take approximately 25 seconds to vent across the valve orifice. After an
appropriate dispersal period (« ^A hour), another charge can be set. This would result in twelve (12)
cylinders being vented in a single day. The total daily fluorine load would be 12 cylinders/day x 8
lbs/cylinder = 96 pounds/day. The entire operation would take between 5 and 6 days.
Detonation products from N2F4 will include NO, and hydrogen fluoride (HF) gases. Mass balance
calculations show that a total of 9.6 pounds of hydrogen fluoride and 11.04 pounds of NO2 would be
produced from remediating the N2F4 cylinders.
Printed on recycled oaper
DAQT-073-93
Page 2
Dispersion Modeling
The EPA- approved model SCREEN was used to calculate a 1-hour concentration, which was then
compared to Threshold Limit Values (TLV) for fluorine to determine whether or not the fluorine
release is acceptable. The 1-hour concentration was converted to an 8-hour average by multiplying
by a factor of 0.7. The industrial hygiene TLV value for fluorine is 1.6 mg/m' as set by the
American Conference of Governmental Industrial Hygienists (ACGIH). The Utah ambient acceptable
limit (AAL) of TLV/100 is 0.016 mg/m', or 16 /xg/m'. The TLVs for NO2 and HF resulting from
detonation of the N2F4 cylinders are both higher than the TLV for fluorine. Therefore, modeling for
fluorine is sufficient to insure acceptable impacts from N2F4.
Listed in the following tables are the source parameters used in the modeling.
Table 2. Point Source Parameters
.PARAMKl'EK:
Source Type
Locatioii (UTM East, m)
Location (UTM North, m)
Emission rate (g/s)
Stack Height (m)
Stack Diameter (m)
Stack Velocity (m/s)
Stack Gas Temperature (°K)
Ambient Air Temperature (°K)
••••:'Kih>::#l--
P
00
00
1.513
1.0
1.0
1.0
293
293
The SCREEN model treats the fluorine emissions as an emission from a smokestack. A number of
SCREEN runs were made with variations in parameter values to determine their respective, relative
influences upon the magnitude of ground level concentrations. Varying the values had negligible
influences, with the exception of stack height and exit temperature; therefore, those two parameters
were set at values to insure the most conservative (maximum concentration) results.
Air Qualitv Impacts
The modeling analysis has been verified and found to be in accordance with EPA and Division policy,
and in accordance with pre-approved modeling protocol. The modeling shows that the maximum
8-hour, fenceline concentration for fluorine would be 49 /ig/m'; which exceeds the AAL. The
maximum fenceline concentration under neutral and unstable meteorological conditions was 14 /xg/m'.
Therefore, the applicant proposes to limit remediation operations to those days that would not consist
of stable (stability categories E and F) conditions. Although there is not a one-to-one correspondence
DAQT-073-93
Page 3
between stability classes and the clearing indices, it is assumed that a daytime clearing index greater
than 500 excludes stability classes E and F.
NAAOS Not applicable.
PSD Increment Not applicable.
Toxics The SCREEN model indicates that all ground level concentrations will be less than
Utah's AAL's for the toxics from the proposed operations.
Recommendation
The result of the modeling run shows that there should be no violations of the Utah's toxic AAL's
when operations are conducted with a daytime clearing index of 500 or greater. Based on these
results, it is recommended that an Approval Order be issued to Hercules for the remediation of
fluorine and N2F4 cylinders.
RS/jc
08-12-^
17:17 b/.
*** SCREEN-1.1 MODEL RUN ***
*** VERSION DATED 88300 ***
Pit 38, A Stability Class, 3,125 feet to fenceline
SIMPLE TERRAIN INPUTS:
SOURCE TYPE = POINT
EMISSION RATE (G/S) = .1260
STACK HEIGHT (M) = 1.00
STK INSIDE DIAM (M) = 1.00
STK EXIT VELOCITY (M/S)= 1.00
STK GAS EXIT TEMP (K) = 293.00
AMBIENT AIR TEMP (K) = 293.00
RECEPTOR HEIGHT (M) = .00
lOPT (1=URB,2=RUR) = 1
BUILDING HEIGHT (M) = .00
MIN HORIZ BLDG DIM (M) = .00
MAX HORIZ BLDG DIM (M) = .00
BUOY. FLUX = .00 M**4/S**3/ MOM. FLUX
*** STABILITY CLASS 1 ONLY ***
iiiiicii'k'k'k'k'k'k'k'k'k'k-k'k'k'k'k'kicic'k'kiic-k'k'k'kic'k'k-k-k
*** SCREEN AUTOMATED DISTANCES ***
**********************************
25 M**4/S**2.
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST
(M)
100.
200.
300.
400.
500.
600.
700.
800.
900.
1000.
.XI MUM
100.
CONC
(UG/M**
50.37
12.36
5.382
2.970
1.868
1.282
.9506
.7626
.6538
.5853
3) STAB
1
1
1
1
1
1
1
1
1
1
1-HR CONCENTRATION
50.37 1
UIOM
(M/S)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
AT OR
1.0
USTK
(M/S)
1.0
1.0
1.0
1,0
1.0
1.0
1.0
1.0
1.0
1.0
BEYOND
1.0
MIX HT
(M)
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
100. M:
320.0
PLUME
HT (M)
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
SIGMA
Y (M)
31.4
61.6
90.7
118.8
146.1
172.4
198.0
222.8
247.0
270.5
31.4
SIGMA
Z (M)
25.2
52.6
82.1
113.5
147.0
182.1
219.0
257.6
297.7
339.4
25.2
DWAS:
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH^NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
*********************************
*** SCREEN DISCRETE DISTANCES ***
*********************************
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST CONC
(M) (UG/M**3)
952 6148
UIOM
STAB (M/S)
1 1.0
USTK MIX HT
(M/S) (M)
1.0 320.0
PLUME
HT (M)
3.0
SIGMA
Y (M)
259.3
SIGMA
Z (M) DWASH
319.2 NO
DWASH= MEANS NO CALC MADE (CONC = 0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
*** SUMMARY OF SCREEN MODEL RESULTS ***
***************************************
CALCULATION
PROCEDURE
SIMPLE TERRAIN
MAX CONC
(UG/M**3)
50.37
DIST TO
MAX (M)
100.
TERRAIN
HT (M)
0.
***************************************************
** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS **
***************************************************
*** SCREEN-1.1 MODEL RUN ***
*** VERSION DATED 88300 ***
Pit 38, B Stability Class, 3,125 feet to fenceline
SIMPLE TERRAIN INPUTS:
SOURCE TYPE = POINT
EMISSION RATE (G/S) = .1260
STACK HEIGHT (M) = 1.00
STK INSIDE DIAM (M) = 1.00
STK EXIT VELOCITY (M/S)= 1.00
STK GAS EXIT TEMP (K) = 293.00
AMBIENT AIR TEMP (K) = 293.00
RECEPTOR HEIGHT (M) = .00
lOPT (1=URB,2=RUR) = 1
BUILDING HEIGHT (M) = .00
MIN HORIZ BLDG DIM (M) = .00
MAX HORIZ BLDG DIM (M) = .00
08-12-9:;
17:18:30
BUOY. FLUX = .00 M**4/S**3/ MOM. FLUX
*** STABILITY CLASS 2 ONLY ***
**********************************
*** SCREEN AUTOMATED DISTANCES ***
**********************************
,25 M**4/S**2
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST
(M)
100.
200.
300.
400.
500.
600.
700.
800.
900.
1000.
XI MUM
100.
CONC
(UG/M**
50.37
12.36
5.382
2.970
1.868
1.282
.9506
.7626
.6538
.5853
3) STAB
2
2
2
2
2
2
2
2
2
2
1-HR CONCENTRATION
50.37 2
UIOM
(M/S)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
AT OR
1.0
USTK
(M/S)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
BEYOND
1.0
MIX HT
(M)
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
100. M;
320.0
PLUME
HT (M)
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
SIGMA
Y (M)
31.4
61.6
90.7
118.8
146.1
172.4
198.0
222.8
247.0
270.5
31.4
SIGMA
Z (M)
25.2
52.6
82.1
113.6
147.0
182.1
219.0
257.6
297.7
339.4
25.2
DWAS
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
*********************************
*** SCREEN DISCRETE DISTANCES ***
*********************************
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST
(M)
952.
CONC
(UG/M**3)
.6148
UIOM USTK MIX HT
STAB (M/S) (M/S) (M)
1.0 1.0 320.0
PLUME
HT (M)
3.0
SIGMA
Y (M)
259.3
SIGMA
Z (M) DWASH
319.2 NO
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
***************************************
*** SUMMARY OF SCREEN MODEL RESULTS ***
***************************************
CALCULATION
PROCEDURE
SIMPLE TERRAIN
MAX CONC
(UG/M**3)
50.37
DIST TO
MAX (M)
100.
TERRAIN
HT (M)
0.
***************************************************
** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS **
***************************************************
17:27:2G
*** SCREEN-1.1 MODEL RUN ***
*** VERSION DATED 88300 ***
Pit 38, C Stability Class, 3,125 feet to fenceline
SIMPLE TERRAIN INPUTS:
SOURCE TYPE = POINT
EMISSION RATE (G/S) = .1260
STACK HEIGHT (M) = 1.00
STK INSIDE DIAM (M) = 1.00
STK EXIT VELOCITY (M/S)= 1.00
STK GAS EXIT TEMP (K) = 293.00
AMBIENT AIR TEMP (K) = 293.00
RECEPTOR HEIGHT (M) = .00
lOPT (1=URB,2=RUR) = 1
BUILDING HEIGHT (M) = .00
MIN HORIZ BLDG DIM (M) = .00
MAX HORIZ BLDG DIM (M) = .00
BUOY. FLUX = .00 M**4/S**3; MOM. FLUX
*** STABILITY CLASS 3 ONLY ***
.25 M**4/S**2
**********************************
*** SCREEN AUTOMATED DISTANCES ***
**********************************
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST
(M)
100.
200.
300.
400.
500.
600.
700.
800.
900.
1000.
MAXIMUM
100.
CONC
(UG/M**
91.76
23.61
10.70
6.131
3.992
2.819
2.104
1.637
1.317
1.091
3) STAB
3
3
3
3
3
3
3
3
3
3
1-HR CONCENTRATION
91.76 3
UIOM
(M/S)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
AT OR
1.0
USTK
(M/S)
1.0
1.0-
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
BEYOND
1.0
MIX HT
(M)
320.0
- 320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
100. M:
320.0
PLUME
HT (M)
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
SIGMA
Y (M)
21.6
42.3
62.4
81.7
100.4
118.5
136.1
153.2
169.8
185.9
21.6
SIGMA
Z (M)
20.0
40.0
60.0
80.0
100.0
120.0
140.0
160.0
180.0
200.0
20.0
DWASH
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
*********************************
*** SCREEN DISCRETE DISTANCES ***
*********************************
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST
(M)
952
CONC
(UG/M**3)
1.190
UIOM USTK MIX HT PLUME
STAB (M/S) (M/S) (M) HT (M)
1.0 1.0 320.0 3.0
SIGMA
Y (M)
178.2
SIGMA
Z (M) DWASH
190.4 NO
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
***************************************
*** SUMMARY OF SCREEN MODEL RESULTS ***
***************************************
CALCULATION
PROCEDURE
SIMPLE TERRAIN
MAX CONC
(UG/M**3)
91.76
DIST TO
MAX (M)
100.
TERRAIN
HT (M)
0.
***************************************************
** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS **
***************************************************
08-12-95
17:27:49
*** SCREEN-1.1 MODEL RUN ***
*** VERSION DATED 88300 ***
Pit 38, D Stability Class, 3,125 feet to fenceline
SIMPLE TERRAIN INPUTS:
SOURCE TYPE
EMISSION RATE (G/S)
STACK HEIGHT (M)
STK INSIDE DIAM (M)
STK EXIT VELOCITY (M/S)=
STK GAS EXIT TEMP (K)
AMBIENT AIR TEMP (K)
RECEPTOR HEIGHT (M)
lOPT (1=URB,2=RUR)
BUILDING HEIGHT (M)
MIN HORIZ BLDG DIM (M) =
MAX HORIZ BLDG DIM (M) =
POINT
.1260
00
00
00
293.00
293.00
.00
1
.00
.00
.00
BUOY. FLUX = .00 M**4/S**3/ MOM. FLUX
*** STABILITY CLASS 4 ONLY ***
25 M**4/S**2
**********************************
*** SCREEN AUTOMATED DISTANCES ***
**********************************
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST
(M)
100.
200.
300.
400.
500.
600.
700.
800.
900.
1000.
CONC
(UG/M**3)
180.4
47.56
21.91
12.73
8.403
5.011
4.545
3.577
2.904
2.415
STAB
4
4
4
4
4
4
4
4
4
4
UIOM
(M/S)
1.0
1.0
1.0
1.0
USTK MIX HT
(M/S) (M)
PLUME
HT (M)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
MAXIMUM 1-HR CONCENTRATION AT OR BEYOND
100. 180.4 4 1.0 1.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
320.0
100. M:
320.0
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
*********************************
*** SCREEN DISCRETE DISTANCES ***
*********************************
0
0
0
0
0
0
0
0
0
0
3.0
SIGMA
Y (M)
15.7
30.8
45.4
59.4
73.0
86.2
99.0
111.4
123.5
135.2
15.7
SIGMA
Z (M)
13.8
27.2
40
52
65
77
89
100
111
122
13.8
DWASH
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST
(M)
952.
CONC
(UG/M**3)
2.631
STAB
4
UIOM
(M/S)
1.0
USTK
(M/S)
1.0
MIX HT
(M)
320.0
PLUME
HT (M)
3.0
SIGMA
Y (M)
129.6
SIGMA
Z (M)
117.6
DWASH
NO
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
***************************************
*** SUMMARY OF SCREEN MODEL RESULTS ***
CALCULATION
PROCEDURE
SIMPLE TERRAIN
MAX CONC
(UG/M**3)
180.4
DIST TO
MAX (M)
100.
TERRAIN
HT (M)
0.
***************************************************
** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS **
***************************************************
08-12-93
17:59:56
*** SCREEN-1.1 MODEL RUN ***
*** VERSION DATED 88300 ***
Pit 38, E Stability Class, 3,125 feet to fenceline
SIMPLE TERRAIN INPUTS:
SOURCE TYPE
EMISSION RATE (G/S)
STACK HEIGHT (M)
STK INSIDE DIAM (M)
STK EXIT VELOCITY (M/S)=
STK GAS EXIT TEMP (K)
AMBIENT AIR TEMP (K)
RECEPTOR HEIGHT (M)
lOPT (1=URB,2=RUR)
BUILDING HEIGHT (M)
MIN HORIZ BLDG DIM (M) =
MAX HORIZ BLDG DIM (M) =
POINT
.1260
1
1
1
00
00
00
293.00
293.00
.00
1
.00
.00
.00
BUOY. FLUX = .00 M**4/S**3/ MOM. FLUX
*** STABILITY CLASS 5 ONLY ***
25 M**4/S**2
**********************************
*** SCREEN AUTOMATED DISTANCES ***
**********************************
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST
(M)
100.
200.
300.
400.
500.
500.
700.
800.
900.
1000.
CONC
(UG/M**3)
456.9
131.7
63.75
38.51
26.28
19.35
15.02
12.10
10.04
8.510
STAB
5
5.
5
5
5
5
5
5
5
5
UIOM
(M/S)
USTK
(M/S)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
MAXIMUM 1-HR CONCENTRATION AT OR BEYOND
100. 456.9 5 1.0 1.0
MIX HT
(M)
5000.0
5000.0 •
5000.0
5000.0
5000.0
5000.0
5000.0
5000.0
5000.0
5000.0
100. M:
5000.0
PLUME
HT (M)
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
iiieicizi^'k-k'k'k'kic'k'k'k'k'k-k'k'k'k'k'k'k'k'k'k'k'kic'k-k-k-k
*** SCREEN DISCRETE DISTANCES ***
*********************************
3.
3,
3,
3,
3,
3,
3,
3,
3,
3,
3.0
SIGMA
Y (M)
10.8
21.2
31
40
50
59
68
7 6.
84
2
9
2
3
1
6
9
93.0
10.8
SIGMA
Z (M)
7
14
19
25
30
39
43
34.8
47.0
50.6
7.5
DWASH
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***
DIST CONC UIOM USTK MIX HT PLUME
(M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M)
952. 9.189 5 1.0 1.0 5000.0 3.0
SIGMA SIGMA
Y (M) Z (M)
89.1 48.9
DWASH
NO
DWASH= MEANS NO CALC MADE (CONC =0.0)
DWASH=NO MEANS NO BUILDING DOWNWASH USED
DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED
DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED
DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB
***************************************
*** SUMMARY OF SCREEN MODEL RESULTS *** ***************************************
CALCULATION
PROCEDURE
SIMPLE TERRAIN
MAX CONC
(UG/M**3)
456.9
DIST TO
MAX (M)
100.
TERRAIN
HT (M)
y^^,^,^^^*********************************************
** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS **
***************************************************