Document G65aERXNddXDZ1ZD2d7yB1p2V
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Jitaie of (iHonlana ...
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,Siatp department of ^ealitj
Helena. Montana November 27, 1968
Hr. E. D. Lovick, Manager Libby Operations Zonolite Company Libby, Montana 59923
Dear Mr. Lovick:
Enclosed are additional results concerning sampling done at your plant some months in the past which we believe will be of some interest to you. This information indicates the need for continued vigilence in the reduction of dust concentrations at your Libby mill.
Sincerely yours
BFWrma Enc.
Benjamin F. Wake, Director Div. of Air Pollution Control and Industrial Hygiene
15162478
DEPARTMENT OF HEALTH. EDUCATION. AND WELFARE
PUBLIC HEALTH SERVICE
0604608^
NATIONAL CENTER TOR URBAN AND INDUSTRIAL HEALTH
I0t BROAOWAY CINCINNATI. OHIO 5202
October 17, 1968
REFER TO:
Hr, Benjamin F, Wake, Director Division of Air Pollution Control
and Industrial Hygiene State Department of Health Helena, Montana 59601
Dear Ben:
Enclosed are the last of the results from our survey of the W. R. Grace Co. Zonolite plant at Libby, Montana. The tremolite analysis by X-ray diffraction took some time since the vermiculite had a peak in the same area as the principle peak of tremolite. As you can see the airborne dust collected on Hi-Vol filters was high in tremolite while the product contains very little tremolite. This indicates that whatever tremolite is present in the ore is ending up in the air. The cyclone waste would probably be higher in tremolite if a more efficient collector were used.
Please let me know if I can give you any further assistance with this problem.
Sincerely yours
Enclosures
'^/Jeremiah R. Lynch Assist. Chief, Environmental Activities Field Studies Occupational Health Program
15162479
.
Field No.
Hi-Vol Filter Identification
Location
Total Dust
38-023 38-004 38-001 38-011 38-141 38-020
Dry Mill, 1st floor Dry Mill, 3rd floor Dry Mill, 3rd floor Dry Mill, 4th floot Verxite Plant Outside-near office
26.4 22.3 27.1 12.0
2.5 1.2
06046088
Tremolite
Z mg/m3
60 14.0 74 16.5 73 19.8 78 9.4 71 1.8 80 1.0
15162490
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Memorandum
TO ..tit:
FROM
issoci'wc Chi'-'f, .or 1-]I titu-'lcs, LA, Jeremiah J.ynch
Actin'; Chief, Laboratory oi .'hyslcal ^ Chemical Analysis,
DATE: October Id ">3
SUBJECT :
Results of the jc-tormin .tior. of Aichc!, Chromium, Cob : It,
ariose,
.in ;nesiun m:' V"c~iolito in 0 ..tnosoheric Just and 13 full: Jn-roles
(Lab. Nos. A5-rr.::* - A Vf>33/
The 0 atmospheric dust ampler, collected on l!i-Vol filters me' the 12 built samples nil collector! it Libby, Aontnna 'nvo boon analyze'! for nickel, chromium, cobalt, manganese and nut;nesiuii usin; atonic absorp tion spectrophotouctric procedures. ..11 of the above samples have also boen analyzed for the percent trenolite. uie sample of tremolite (lab.
number 45621; supplied by ,ir. hynch was used to prepare the stand ire curves and all samples -/ere compared to this material. The limit of detect-ibi-lity of 61 te X-ray diffraction is 3 percent; therefore, some of the samples will be reported in this manner as trcmolite ms not detected by x-ny analysis. fro results of these determinations are presented in the following t-.ble. (ieo `.ttached)
Hichard
4
J1T3TY1
HELP ELIMINATE WASTE
CCOfS- T REDUCTION PROGRAM
ITLSAAJ
15162481
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