Document Mo7Nbda8bx2xbZXoJ8EKOQRd7
FILE NAME Kelly Moore KM
DATE 1975 June
DOC KM022
DOCUMENT DESCRIPTION Report - Airborne Fiber Counts for Paco Textures Company
AIRBORNE FIBER COUNTS for
Paco Textures Company
Los Gatos California
Date Sampled June 12 1975 Date Reported June 30 1975
Samples Collected By H. B. Rhodes Union Carbide Corporation
gir
Samples Analyzed By B. L. Ingalls
Union Carbide Corporation
Reported By
H. B. Rhodes
Union Carbide Corporation
KM 01235
Union Carbide Corporation
Metals Division Niagara Falls New York
PLAINTIFF'S tabbies EXHIBIT
--"----,
OBJECTIVES
1. To measure the airborne asbestos fiber counts during the mixing and spraying of ceiling texture spray
2 To compare the asbestos fiber counts for products containing
Canadian grade 7M05 asbestos and Canadian HPO
DESCRIPTION OF OPERATION
The tests were carried out at two locations in Los Gatos CA. In each case ceiling texture formulations differing in the type of asbestos
used were sprayed by the same operator under very similar conditions The first series of tests was typical of the small custom operation while the second was more representative of large production type procedures
,
and equipment
In the first sequence Pyramid Painting and Drywall the operator added four pound bags of Decotex containing 5.2 of M 7M05 Canadian
asbesto ins to the top of a small Spray Force sprayer with a capacity
of 90 gallons Approximately half of the ceilings in a large single house were sprayed with this mixture The tank was then washed out and 4 bags of Decotex containing 4.1 of Calidria HPO were mixed and sprayed The mixture ran out before the spraying was completed and two more bags were
mixed
Personal samples were taken on the operator during each main mixing and during each spraying sequence The two bag supplementary mixing was not sampled The wiper was sampled during each spraying One area sample was taken in the opposite end of the house during the spraying of the Canadian containing material.and the initial part of the Calidria containing operation
The second sequence was run at another locatioinn Los Gatos with a large mounted spray unit Four bags of Decotex containi% ng HPO
were added to the mixer which was already partially filled The ceilings
in a complete house were sprayed A bag blenodf the Decotex blend of containing 2.5 Canadian 7M05 was then mixed and sprayed on the ceilings
a second house These blends contained an additional pound of styrofoam and
were thicker than that used in the first location There was some problem
with the spraying of the Canadian was reduced from 120 to 70 psig with the Calidria based product
containing
There was
and material working pressure
still more fine overspray than
;
Personal samples were collected on the spray operator during each ..
mix and during each spraying sequence Personal samples were collected on
the wiper during each spraying
KMX 00164
SAMPLE EQUIPMENT AND TEST PROCEDURES
_ Sampling and dust counting were carried out in accordance with OSHA
Regulation 1910.1001 using the Bayer Zummalde and Brown method for
Bureau counting asbestos fibers by phase contrast microscopy
Safety and Health Feb. 1969
of Occupational
Battery air pumps M.S.A. type calibrated to 2 liters per minute were used to collect personal breathing zone and environmental samples
on Millipore membrane filters of 0.8 micron porosity
. Fiber counting was performed on a Nikon phase contrast microscope
at 400X utilizing a Porton reticle for sizing and field definition
Two results have been reported for each sample - they are
1. Total Fiber - Any material longer than 5 microns having an aspect ratio greater than 3 This number will include the
asbestos fibers as well as other particles which meet the fore-
going criteria If tremolitic talc is present in the sample
the tremolite chips and anthophyllite impurities if present
would also be in this category
2. Chrysotile Asbestos Fiber - Any fiber longer than5 microns
having an aspect ratio greater than 3 which in the judgement
of an experienced operator could be chrysotile asbestos
COMMENTS
The OSHA regulations permit a maximum limit of 5 fibers greater than
cubic 5 microns in length per
weighted average TWA
centimeter of sampled on an hour timeThis allowable level be reduced to fibers
on July 1 1976. The formula C
+ C2T2 + CT describes the TWA where
/
= fiber count in fibers and T = time
.
The regulations also stipulate a ceiling concentration of 10 fibers
greater than 5 microns which is not to be exceedeadt any time
TEST RESULTS
collection The details of sample
in the attached table
and resultant fiber counts are listed
KMX 00165
SUMMARY OF FIBER COUNTS
Sample
No.
Air Sample
Time
Minutes
_
First Tests - Pyramid Paint
08
8 26-8 36am
10
- 02
8 40-8 56am
16
03
04am
8
Ak:
05
19am
11
;
i
one
15-9 16am
i
07
.
06
~
04
40-9
20
,
26am
24
07am
17
Operation Description
Airborne Fiber Count
fibers 5...
Total
Chrysotile
Asbestos
Personal sample Operator Ray
37
Struve mixing 4 bags of Decotex
ceiling spray Contained 5.2 of
Canadian 7M05 limestone California
talc kaolin clay and polystyrene
aggregate Actual handling of
asbestos took minutes Remainder
of time used in wetting and mixing
3.2
Personal sample Operator Ray
1.8
1.6
Struve during spraying Canadian
containing blend Spray on for 12
minutes Canadian asbestos
Personal sample Operator Ray
3.4
2.7
Struve mixing 4 bags of Decotex
ceiling spray Contained 4.1 of
Calidria asbestos HPO Other
ingredients same as for sample 08
.Personal sample Operator Ray
Struve spraying texture containing
HPO
-
_
Operator mixed two bags of HPO based material This operation was not
sampled .
---
0.9
No Sampled
Personal sample Helper Bill Under- 1.0 wood wiping overspray on walls Canadian asbestos containing spray
Same as 07 During spraoyf
0.7
material containing HPO
0.8
"
0.5
Area sample In opposite end of
0.6
0.4
house during spraying of Canadian
containing material between opera- ;
tions and the start of the Calidria
containing material
KMX 00166
7 Summary of Fiber Counts - Continued
-2-
|
Sample
No.
Air Sample
Time
Minutes
Second Tests
Operation
Description
Operation Description
Airborne Fiber Count
fibers 5...
Chrysotile
Total
Asbestos
67
53pm
23
Personal sample Spray operator
1.8
1.5
Bill Lowe mixing 4 bags of Decotex
containing 2.0 HPO More styrofoam
than AM samples Other ingredients
same as 08 Actual dumping took
~ minutes
1 53-2 30pm 35pm
89
36-3 12pm
97
~
34pm
100
25-3 16pm
27
Personal sample Operator spraying
1.2
one house 20 minutes spraying
14
Personal sample Spray operator
0.9
Bill Lowe mixing 12 bags of Decotex
containing 2.5 Canadian 7M05
asbestos More styrofoam than AM
samples Other ingredients the same
Actual dumping took 10 minutes
36
Personal sample Spray operator
1.6
Bill Lowe adjusting sprayer and
spraying second house with Decotex
containing Canadian asbestos About
27 minutes actual spraying
=
34
Personal sample Wiper Bill Brede-
1.1
hoft during spraying of HPO contain-
ing texture 1st house
_
51
Personal sample Wiper Bill Brede-
0.9
hoft during spraying Canadian .
asbestos containing texture 2nd house
0.9 0.8
1.0 0.8 0.7
KMX 00167