Document 65j1BMKqXn7eMZJV1yDkzad4d
March 27, 1963
Mr. L. O, Griffith Jr. Works Manage? Pittsburgh Coming Co, Port Allegany, Pennsylvania 16743
Dear Mr. Griffith:
Tlia analysis of the air samples collected in your plant during our survey in April 1967 has been completed, and the results arc attached. The iopingcr sacplcs were counted during the survey using the American Conference of Governmental Industrial Hygienists* mettod. The membrane filters wore rendered transparent with a 50-50 mixture of diethyl oxalate, dimethyl phthalate and counted at 43GX magnification vlth phase contrast illumination.
The dust concentrations aa closured by implogcr exceeded the 5 million particico par cubic foot Threshold Limit Value currently in uev in a number of,locations. The membrane filter method is experimental and no standard has been-set for its interpretation in this country. (The British Occupational Hygiene Society has issued "Hygiene Standards for Garysotile Asbestos Bust" for the 5 ii + fiber counta in fibers/cc ae follows: Negligible, Less than 0,5; Lov, 0.5-2.0i Medium, 2.0-10.0; High, More than 10.0. They also recommend that "When it is necessary to work in a 'high dust* area an approved mask should be worn, .The standards are for three-snth averagea.) Some relationships between the itnpinger and filter measurement, and some reeulta of surveys of other as bestos product areas, aro discussed in the enclosed reprints.
Tour cooperation in this study is sincerely appreciated and the data gained from your plant is of considerable value,
Sincerely yours.
PLAINTIFF'S EXHIBIT
WV-09656
Enclosure cc: Br. loe Grant
Jeremiah R. Lynch Asst. Chief, Environmental
Activities Field Studies ' y^' f 1 Occupational Health Program
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Results of Air Gacples of April 1567 Pittsburgh Coming, Fort Allegany, Pennsylvania
*z:
Operation
Feeder *> `^Vvv
B P
Forraing^ Builder
G B
C
Iinplnftor Sample nooef
206 7.3 \ 116 11.0 j
103 1.9 m 2.1 . 114 2.4 A 128 9.8 222 5.6 203 2.6 142 24.3 /
125 8.6
Membrane Filter
Flbors/ce Sflmnl rt # Tatal 5.ai +
207
186.2
106.0
117
205
33.6
20.9
237 207.67 124.47
423 275.78 175.63
.n*
115
129
334.2
204.2 ^ mm
223
71.9
20,6 IS
209
91.8
41.7
-
143
113.0
59.4
*
200 202.29 118.69
201
74.7
48.7
i?
204
76.4
35.8
220
139.63
80.54
b:
234
140.40 74.12
-
235 315.71 201.41 ^
236 323.32 199.49
424 *' 136.67
72.67
425 170.31 93.31
y.
426
105.3
58.7
427 135.71 105.26
423 134,90 93.50
NOTES: B - Breathing zone simultaneous inkingor-membrane filter nancies.
? - Personal membrane filter sauries collected by a sampling pump worn by the worker.
G - General air samples
I:
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Pittsburgh Corning
, * Operation
* _______________________
Finishing Saw Operator
p
>. Material Handler
B G
Packine and Insaeetion
* Packer
B
Inspection Foreraan
Class Block Selector
Coating Machine Operator
Press Operator
Sealing Machine Operator
Spray Painter Polyurethane
Mixer
P P
B P P
P P
P
P
Itrolnftcr
Sagolft fl tnm>c
134 3.7
126 151 131
140 138
4.2
6.1 3.0
5.2 \ 5.1 j
232 0.4
Membrane Filter Fibers/cc
Sample # Total 5 ji +
135
44.4
21.6 U'"'
212
64.0
36.4
213
58.6
42.2
214
47.8
33.1 (S'
215
33.9
17.2
137
53.4
25.7
141 139 an 210
233 227 226
223 229
217
219
46.4 52.1
10.4
27.1
24.9 30.0 Is
6.2
13.4 -
0.0 6
. 0.0
0.0 .1
0.0
0.0 0.0 .5 .1
.1 .0 .2 .0
Pittsburgh Corning * Operation.
Polyurethane Hot Wire Machine Operator
. Saw Operator
B
P B P
Foaaglftse . Mold filler
B P
Band Sowyer (FAB)
>
B P
Foam Boa Builder
Packer (Piniahiog)
B B
P
Cutter
Stacker (FAB)
Block and Foma Weigher
P B B
- 3*
Ippirmar___________
Membrane Filter
Fibers/ce
Sample rnooci
Krtrunlp d Total 5 u +
224 1.6
225 5.5
1.2
230 0.3
216 .7
213 3.2 221 1.5
.2
1.2 .3
419 4.8 413 3.0
418 9.5
406 i.O 407 1.9
412 6.4
.3
.2 .7
1.6
401 14.4
402 5.0 403 3.4 409 22.5
421 417 423
415 233
12.8 \ 13.3 13.5 j
1.7 3.7
420 20.8
416 13.0 422 10.4
404 2.2 4X0 16.3
411 6.4 400 14,4
405 5.2 403 3.3
' * 414
rS.7--;
*' >
-.01;
i ,* r- -23,9-
5.6 * --
4.0 1.8 1.0 3.3
.a\
\i \ 1.4
.4 2.5 1.0 4.0
1.5 .3
0.7
.7