Document 7O26yJ9zmokQz943aOBnOezQj
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Interoffice Communication
to From
Date subject
c. E. Gremillion P. L. Fetzer January 25, 1977 Deregulation of Laboratory Regulated Area
The last corrective step to reduce the vinyl exposure to laboratory analyst was completed September 2, 1976. This consisted of enclosing the area above the west hood. To determine the Effectiveness of this corrective step a statistical analysis was undertaken. All data points from the fixed point monitor for a three week period prior to and after enclosing were tabulated. A frequency distribution for those points over 1 ppm, over 10 ppm and the average concentration were obtained. This information is shown on the attached table.
I recommend the laboratory be deregulated based on the following; 1) A 53.6% reduction in the frequency of consecutive points over 1 ppm 2) The average concentration, of 0.41 ppm, decreasing below the action level
The temporary enclosure above the hood should be reinstalled so that hood maintenance and lab light maintenance can be accomplished.
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P. L. Fetzer
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WC 000010009
BEFORE AFTER
No. of Total Data Points
2598
2460
Average Concentration ppm VCM
.71
.40
Frequency of Consecutive Points Over 1 ppm 2 3 4 5 6 8 9 10 12 13 14 18 35
37 15 14 8
3 1 53 22
4522
2
1 11 11
Percent of Time of Consecutive Point Over 1 ppm
12.32
5.73
BEFORE AFTER
No. of Total Data Points
2598
2460
Frequency of Consecutive Points Over 10 ppm 34 5
22 2 00
Percent of Time of Consecutive Point Over 10 ppm
0.92
0.41
TOTAL PERCENT OF TIME OF CONSECUTIVE VALUES OVER 1 ppm
BEFORE 13.24
AFTER 6.14
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0010010
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Interoffice Communication
To C. E. Gremillion
From P. L. Fetzer
Date March 9, 1977
subject Deregulation of the Laboratory Regulated Area
The tank car samples are normally analyzed between 0800 and 1200 hours each day there are shipments. The attached tables I, & II shows the in dividual fixed point monitoring data for the Laboratory during this time period. The four hour, one-hour and highest twenty minute averages are shown for each day that data was available. An asterisk indicates those days when tank cars were loaded.
This data shows the higest twenty minute average to be 2.1 ppm, well below the fifteen minute limit of 5.0 ppm. The highest value for any one hour exposure was 1.06 ppm and the four hour value was 0.41 ppm. These values indicates the high exposure previously experienced during the tank car analysis has been corrected.
The fixed point monitor hourly summary sheet was examined for January and February. Only six values out of 1416 data points exceed 1 ppm, the highest value being 4.0 ppm.
The number of Laboratory dosimeter testing during 1976 were tabulated for the time periods, January thru August, September thru December and January thru February for 1977. These periods correspond to the time prior and following enclosing the space above the vent hood. The data (see table III) shows that no exposures above 1 ppm has occurred since this corrective step was taken.
Based on the evaluation of this data, it is recommended that the Laboratory regulated area be deregulated.
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P. L. Ftzer
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TABLE I
LABORATORY FIXED POINT MONITORING DATA
JANUARY 1977-
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VVC 000010012
TABLE I I
LABORATORY FIXED POINT MONITOR DATA
FEBRUARY 1977-
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TABLE III LABORATORY PERSONNEL
DOSIMETER DATA
1976 Jan thru Aug (Before enclosing Hood) Aug thru Dec
1977 Jan thru Feb
No. Analyzed 20 9
4
No. Over 1 ppm 3 (1.66 highest value) 0
0
VVC 000010014
Interoffice Communication
to J. H. McCulley
From P. L. Fetzer
Date August 13, 1976
subject
Stream Sampling - EDC Exposure
Shown below are the results from the personnel dosimeter testings conducted while sampling the EDC streams in Blk I and II.
Date 8-6
Time-hr. 0.25 0.25 0.25 0.25
BLK I TO5! TUT~
0.0 1.6
1.25 36.9
BLK II TOI "TUT 0.87 0.0
0.0 0.0
8-9 0.25 0.25
0.01
0
0.01 2.00
8-10
7.0
2.45 1.51
8-11
0.50 0.25
0.0 0.0
1.64 0.0
CC: JAD, OF, JRH, CEG
VVC 000010015