Document KzJrgpg31p7EL96BwNGLmQN3x

4, UL '0-2 !*.' i hh l.)? C_/r.i.i. J, OI'U f.'.ETALS DIVISION P. 0- IIOX !)7G -1020 ROYAL AVE . NIAGARA f A L l S. NEW YORK KGU To: Messrs. G.R. Adams W.B. DeAtley R.L. Folkman E.W. Kantz+R.G. Beverly P.W. McDaniel J.L. Myers R.W. Rebholz+F.J. Shortsleeve G. Rouse J.B. Rouse J.J. Sibley A.G. Voress J.J. Whittlesey Originating Dept. June 4, 1980 "Calidria" Asbestos Answering letter date SuDject The attached report is pretty well self-explanitory but I will be glad to try to answer any questions you may have. The results show some fairly high exposures in the early days of our operations but also clearly demonstrate a long standing and effective program to reduce exposure. Although these are area concentrations, not personal exposures, they indi cate that our operations have generally been in compliance with the standards that were applicable at the time. This is not a particular issue here so it has not been emphasized in the discussion. These data are not the kind of thing we have ordinarily released in the past, but I feel the EPA has the power to obtain it if they feel it is worth the effort. It is not particularly sensitive information so it is recommended that we provide it. We are about two months past the time it had been expected that we would provide this information and are receiving weekly phone calls inquiring about its progress. It would be very much appreciated if you could get any comments you wish to make back to me on Friday, June 6 or to John Myers by noon on Monday, June 9 so we can release the report. Very truly yours, HBRrvs Attachment A00G4C PLAINTIFFS EXHIBIT UC-i440 : DRAFT June 4, 1980 Dr. Richard A. Ziskand Science Applications, Incorporated 1801 Avenue of the Stars, Suite 1205 Los Angeles, California 90067 Dear Dr. Ziskand: The attached report provides the information you requested regarding asbestos concentrations in the vicinity of the Union Carbide asbestos mine and mill in California. If you have any questions please let me know. We would be very interested to hear the results of your analysis of this data. Very truly yours, 7M JhUnA, H.B. Rhodes Technology Manager HBR:vs Attachments A0964 | DRAFT June 3, 1980 OUTDOOR AIRBORNE ASBESTOS CONCENTRATIONS AT THE UNION CARBIDE ASBESTOS MINING AND MILLING OPERATIONS IN CALIFORNIA Prepared at the request of: Science Applications, Incorporated 1801 Avenue of the Stars, Suite 1205 Los Angeles, California 90067 By H.B. Rhodes Union Carbide Corporation Metals Division Niagara Falls, New York 14302 A09Q42 INTRODUCTION Science Applications, Incorporated under contract from the Environmental Protection Agency is conducting a study of the impact of various asbestos sources in California on the surrounding population. Union Carbide Corporation was asked and agreed to provide, certain historical information on airborne asbestos at their mine and mill. Particular emphasis was placed on property line measurements in order to estimate general population exposures. BACKGROUND The Union Carbide asbestos mill near King City, California started up in 1963 and has been in essentially regular operation since that time. The mill uses a unique wet process which greatly facilitates control of both worker ex posure and environmental asbestos release. Ore is mined by a cut-and-bench procedure in the Diablo Mountains about 55 road miles away. Mining takes place for about a two-month period every three years with the mined material stockpiled at the mine. Ore is hauled to the mill by truck for about six months each summer. Sufficient material is stored at the mill to last through the winter when rain makes the mine site impassible. A comprehensive industrial hygiene program has been carried out at this location since 1963. The program includes worker exposure monitoring, regular medical surveillance, and worker safety and health training. Extensive efforts have been made to reduce both exposure and emissions. *09643 -2- ASBESTOS CONCENTRATION MEASUREMENTS The main emphasis in the industrial hygiene program was on worker pro tection so the great majority of the concentration measurements were made in the direct proximity to the workers and were generally within the mill. Rather limited sampling was included, however, at the fence lines and occasionally at various places closer to the mill building. These data provided. Seven sets of area samples have been collected over the years at the mine. With one exception, these were all in the immediate vicinity of active mining and milling operations. They are provided with the understanding that they are not property line measurements. From 1963 through early 1969 concentrations were measured with the midget impinger. The NIOSH phase contrast method was adopted in mid-1969 and is still in use. No measurements have been made with electron microscopy pro cedures. When the change from midget impinger to phase contrast microscopy was made in 1969, a rather crudely documented conversion factor of 2 fibers/cc >5u per million particles per cubic foot was developed from comparative measurements. It is both well known and obvious that the conversion from particles to fibers is not a universal factor but will be considerably influenced by the characteristics of the dust cloud being sampled. A wide range of factors have been proposed for this conversion. Since the value of 2 falls within this range and since there is not basis to adjust it to any other value, it has been used in reporting the present data. A 09 64 4 -3- RESULTS AND DISCUSSION The airborne concentrations measured from 1963 through the present in the vicinity around the mill are summarized in Table I and are shown graphically in Figure 1. A layout of the mill property is provided in Figure 2. Figure 1 gives the airborne concentrations, expressed as fibers/cc >5y, as a function of the month and year in which they were measured. The place where the measurement procedure was changed from midget impinger to optical phase contrast is also indicated. Most of the data were taken at the property boundry with that from the north fenceline indicated by an open circle and that from the south fence line by a triangle. For several of the later years a substantial number of samples were collected in close proximity to the mill and these results are shown by the solid circles. A very approximate trend line has been included on the Figure. It is immediately evident that a reduction in concentration of about three orders of magnitude has been made since the plant started up in the early 1960's. The fence line levels are now generally below 0.1 fiber/cc which NIOSH has designated as the detection limit for the method^. As might be expected, the levels directly around the mill tend to be higher than the fenceline but are still quite low. The data for the concentrations during the mining and hauling of asbestos ore are shown in Table 2 and Figure 3. It should be reiterated that these are not property line concentrations but were measured during active operations. Here there has been a reduction in concentration of approximately two orders of magni tude. The levels are now well below the current occupational standard of 2 fibers/ cc >5u. ^These data are included even though there'are serious technical reservations regarding the reliability of the measurement method at this apparent concentration level. This is not the place to address this critically important issue. 4 0Qr u^O 4 5 -CONCENTRATIONS UNION CARBIDE CORPORATION 9 fs< tj Mtimiii3M03 ]iii 3Kwmv I a09B4 6 lo* uca Figure 2 ($ NOtlVBlN13NO] B1MJ 3NBOOBIV CARBIDE CORPORATION ASBESTOS MIME H * 3 !tu + t 9 * r /9 6 * t U 7 /9 * S /9 * 9 1970 1971 /f? 4 /9 7 3 / 9 7+ /97J~ , q 7t /<?77 :j*s Sample location North Fence Lin* South Fence Lin* Mill Ore Stockpile Perking Lot Sample Location North Fence Lin* South Fence Line ,, SLerfcltt.. Mppcf11 1 f/CCU1 1.7 3.4 - TABLE i AIPDOPNE AREA FIBER CONCENTRATIONS .Jlainn. 1966____________________ UMaiMrckh Aa.o.n. _ 1967 IJ.a_n. list HPPCf ms. SEEef ms. Mppcf f/cc 22.7 45.8 24.1 48.2 3.8 7.6 7.0 14.0 m -. . 2.6 S.2 3.2 6.4 16.7 33.4 18.2 36.4 . * - -- 1968 Oec Mppcf ms 6.6 13.2 4.4 s.s Jan. Mppcf11*1 (3) f/cc 4.3 8.6 3.4 6.8 1969 Feb July Cf f/cc f/cct3> Aug. f/cc Sect. ms oct. "EecT ms itss -" 4.8 9.6 6 3 7.5 3 3.5 2.5 2 3.5 3 Jan. f/cc iEla. June ms ms 1970 Julv f/cc Auc. f/cc Sept. Oct. f/cc f/cc 1 2 2 1 0 1.5 2.5 1 1.5 1 1 2.5 2 Samele Location North Fence Lin* South Fence Line South Edge, Tailings Da* Southeiat Ed?*, Tailings D*a Product Storage Area Mill Or* Stockpile Apr. f/cc Aug. f/cc 1971 Sept. Oct. 77cc f7cc NOV. UK 2.S 2.5 4.0 6.0 2.0 3.0 2.5 4.0 3.5 2.0 1972 Pet,. Mar. Apr. Kay "Sept. Oct. Oec. T7cc T7cc T/ctT fltc 77cc 77cc 77cc 2.0 - 3.4 0.5 0.17 0.17 0.06 1.5 0.4 *5.1 0.3 0.07 0.06 0.24 1973 Jan. 0c~ f/cc f/cc 0.03 0.32 0.21 1974 Peb. Mar. Apr. May June July Sect. Oct. UK XZfii Liu. xto His ms ms ILLS . . m - 0.5 1.7 0 .17 0.19 0.31 0.2 ..... 0.2 . _ _ _ .... ................................................................................................................................................................................... -1.0 ..... ....... .. - 2.2 0.3 1.7 0.7 - Samole Location North Fenca Lin* South Fence Line 197$ ~ 0.02 0.07 Parking Lot Back of Malnt. Shop East Comer of Mill (RG-244) Nest Side of Mill (RG Surge Tenk) West Side of Mill (Main Baggtr) Southwest Corner (Gas Metar) Electric Substation North Loading Dock (S. Side) North Loading Dock (N. Side) 1976 zz 0.08 0.30* - August f/cc ms 0.08 0.1S 0.20 0.22 0.41 - 0.18 0.19 0.80 - 1 977 October UssVcz -ITcT"f/cc f/cc ' ~f7cc 0.07 0.04 0.04 0.02 0.06 0.06 0.09 0.03 1.17 0.08 0.07 0.07 - 0.19 0.20 0.78 - 0.05 0.09 - 0.08 0.25 0.07 - 0.12 0.10 - 0.10 0.06 - 1971 8 UK 1979 zAuzgk. 0.31 0.04 0.05 - 0.03 1980 Mar.' UK * - - 0.02 0.03 0.06 0.01 Near IMttr Tank 1. Mppcf Mill Ions of particles per cubic foot. Measured by midget impinger. Conversion factor of 2 fibers/cc -Su per million particles per cubic foot used. 2. f/cc Elbert longer than 5 microns per cubic centimeter, All counts after Julv 1969 are by tbe meetirane filter a Tff&e <9 TABLE II AIRBORNE CONCENTRATIONS DURING MINING ANO HAULING OPERATIONS Sampling Location and Operation SEPTEMBER. 1963 Remarks Mppcf^ ^ Alongside wobbler during loading trucks. Variable wind direction and speed so that sampling location is upwind of dust part of time. 4.2 3.8 3.3 3.9 Riding caterpillars cleaning mine site. Much large, nonrespirable material noted. 9.6 10.9 11.3 11.8 Walking across ore pile. Light breeze (5 mph) from west and south. 3.2 3.4 Riding pick-up with windows open on road from mine. Deep dust on portions of road. 4.7 6.0 JUNE. 1966 Beside operator of front loader (no cab) loading ore truck. Contractor operator. 26.0 Area around truck during loading. Visible dust. 15.4 General area around grizzly during truck loading. Much loose, finely divided ma terial on ground. 14.2 AUGUST, 1967 * Beside operator on caterpillar while loosening ore pile. Not visibly dusty nor very windy. 6.3 5.0 Beside operator on front loader while loading grizzly. Conveyor system operating. Visibly dusty but not very windy. 18.0 15.1 16.7 OCTOBER, 1967* Self-propelled. Short section of haul road dry and dusty, no wind. 4.4 Scraper, mining and stockpiling ore 4350 level. Road freshly watered, no wind. 2.9 Bulldozer ) Push loading scrapers) Ore, 4350 level ) Freshly exposed ore, not watered. no wind. 3.0 3.4 3.9 Bulldozer clearing rocks from pit floor. Pit floor, not watered, no wind. 4.0 Front end loader ) Feeding screening plant) Maneuvering area watered several hours earlier, very light breeze. ^ ^Millions of particles per cubic foot. (2)'Fibers/cc >5u. A conversion factor of 2 f/cc >5u per 3.7 3.0 f/cc(2) 8.4 7.6 6.6 7.8 19.2 21.8 22.6 23.6 6.4 6.8 9.4 12.0 52.0 30.8 28.4 12.6 10.0 36.0 30.2 33.4 8.8 5.8 6.0 6.8 7.8 8.0 7.4 6.0 TABLE II - Page 2 *The following description of dust control practices in effect was contained in the re port of this survey: "The sampling was conducted on the afternoon of October 25, 1967. All samples were collected adjacent the operator of the particular equipment while performing normal operations. All haul roads and the front end loader maneuvering area adjacent to the mine stock pile had been watered in accordance with standard practice during the mining operations. It has been practice to water down the front end loader maneuvering area on alternate days pending repair of the air conditioning system. During mining operations it is practice to have a water truck on duty continuously to water mine haul roads, dump areas and the loading area adjacent to the mine stock pile and screening plant. Scraper loading areas were not watered since the freshly exposed asbestos ore is damp. Watering overburden loading areas, however, was found at times to be necessary due to visible dust concentrations." Sample Location and Time 1. Front end loader screening ore - 10:10 a.m. 2. At picnic table - 10:19 a.m. 3. Same as #1 - 10:48 a.m. 4. Same as #2 - 10:55 a.m. 5. On Cat pushing ore. 6. By oil shed - 12:25 p.m. 7. Same as #6 - 12:25 p.m. JUNE, 1972 Conditions Slight overcast - wind 10-15 mph from north ground and ore damp cab open on loader - operator wear ing respirator - water truck work ing in area. 70F - cat working on pile. Same as #1. Filter stained by diesel smoke from loader. Same as #1. Same as #1. Filter stained, by diesel smoke from loader. Same as #1. Wind 10-15 mph fron north. No machinery operating - ground damp - 78F. Same as #6. f/Cc 1.14 0.42 0.86 0.68 0.86 0.48 0.50 A9GS7  TABLE- II Page 3 MAY. 1974 Location, Time, Min. of Sampling, & Temp. 1. Mine pit area, east side. 11:05 a.m., 65F, 30 min. 2. Mine pit area, west side. 11:45 a.m., 65F, 15 min. 3. Screening area, 12:35 p.m., 65F, 30 min. 4. Top of ore stockpile, 1:10 p.m., 65F, 30 min. 5. Top of future stockpile, 1:55 p.ra., 67F, 30 min. Conditions 1. Clear day with east-west intermittent wind about 5-10 mph. f/cc 1.70 2. Full mining operation. 3. Sampler hand carried around the area. 1. Same as above. 2.46 2. Sample was taken for 15 min. be cause mining operation was stop ped for lunch break. 1. Full screening operation. 0.90 2. Clear day with intermittent wind, east-west, at about 5-10 mph. 3. Sampler was hand-carried around the area: 0-10 min. -- Loading section 11-20 min. -- Screening section 21-30 min. -- Stockpile section 4. Full loading operation in hauling trucks. Note: Visible dusts were observed during the loading and screening operations, but the dust could be too big and heavy for the sampler to collect with face down. .1 Clear day with intermittent wind of about 5-10 mph, directions changed to west-east. 0.90 2. Full mining operation. .1 Same as above. 1.60 A TABLE II Page 4 AUGUST 9. 1977 Subject: Location: Conditions: Area Samples Joe 5 Minesite (see sketch for Location). 1) Full screening operations. II Dozer operation on stockpile. Ore truck loading. 4) Moving oversize material. 5) 2-10 mph intermittent vind (use vind meter). 6) Weather temperature of 92 F. Remarks: Die Joe 5 Mine area has been extremely dry since 8-1-77 because of the exhaustion of the "normal" year arround water supply. The Location of today's samples (see sketch) are such that maxi mum dust conditions exist whenever traffic passes. Sample No: Time Remarks 1-1 11:10 AM-12:10 PM 175A performing +1" rock removal; pick-up traffic, (none*) 1-2 12:10 PM- 1:10 PM Four ore trucks and 2 loaders passed; dusty conditions, (none*) 1-3 1:10 PM- 2:10 PM Two ore trucks passed; 125A loader perfor ming +12" rock removal, (none*) 1-4 2:10 PM- 3:10 PM 125A performing +12" rock removal, (none*) f/CC 0.23 0.65 0.70 0.29 Average :0.47 2-1 11:15 AM-12:15 PM 175A performing +1" rock removal; pick-up 0.30 traffic, (none*) 2-2 12:15 PM- 1:15 PM 5 ore trucks passed; 175A loader loading 0.61 trucks: possible Diesel exhaust with sample, (lots*) 2-3 1:15 PM- 2:15 PM 1 ore truck passed; same as above, (little 0.43 to lots*) 2-4 2:15 PM- 3:15 PM Light traffic (Pick-up), (none*) 0.37 Average: 0.43 (*) filter discolored from diesel smoke. Q es3 -TABLE- II Page 6 AUGUST 19. 1977 SubJ ec t: Location: Conditions: Area (3) air samples Joe 5 Pit (see sketch) 1. ) Full screening 4 Truckloading operation. 2. ) Dozer operation on stockpile. 3. ) Approximately 5 mph vind with gusty to 10 mph. 4. ) Temperature 90 F. Remarks Sample No. 3, upwind, approximately mile southeast of Joe 5 Pit center. Approx, elevation 4400'. Samole No. Time Remarks 1-1 11:20 AM- 12:20 PM No traffic. 1-2 12:20 PM- 13:20 PM Light traffic within 50'. 1-3 13:20 PM- 14:20 PM 11 11 it n 1-4 14:20 PM- 15:20 PM No traffic. 2-1 11:25 AM- 12:25 PM No traffic. 2-2 12:25 PM-13:25 PM Light traffic within 100'. 2-3 13:25 PM- 14:25 PM II II II II 2-4 14:25 PM- 15:25 TM No traffic. 3-1 3-2 3-3 3-4 11:40 AM- 12:40 PM 12:40 PM- 13:40 PM 13:40 PM- l4:40 PM 14:40 TM- 15:40 PM Dormant area. hill too. It If n ii it n n it n n ft n f/cc 0.27 0.38 0.20 0.14 Average: 0.25 0.12 0.13 0.34 0.29 Average: 0.22 0.16 0.10 0.12 0.05 Average: 0.11 4o0 June 12, 1980 OUTDOOR AIRBORNE ASBESTOS CONCENTRATIONS AT THE UNION CARBIDE ASBESTOS MINING AND HILLING OPERATIONS IN CALIFORNIA Prepared at the request of: Science Applications, Incorporated 1801 Avenue of the Stars, Suite 1205 Los Angeles, California 90067 By H.B. Rhodes Union Carbide Corporation Metals Division Niagara Falls, New York 14302 4065? INTRODUCTION Science Applications, Incorporated, under contract with the Environmental Protection Agency, is conducting a study of the impact of various asbestos sources in California on the surrounding population. Union Carbide Corporation was asked, and agreed to provide, certain historical information on airborne asbestos at its mine and mill. Particular emphasis was placed on property line measurements in order to estimate general population exposures. BACKGROUND The Union Carbide asbestos mill near King City, California started up in 1963 and has been in essentially regular operation since that time. The mill uses a unique wet process which greatly facilitates control of both worker ex posure and environmental asbestos release. Ore is mined by a cut-and-bench procedure in the Diablo Mountains about 55 road miles from King City. Mining takes place for about a two-month period every two years and the ore is stockpiled at the mine-site. Ore is hauled to the mill by truck for about six months each summer. Sufficient material is stored at the mill to last through the winter when weather conditions inhibit mining opera tions and hauling. A comprehensive industrial hygiene program has been carried out at this location since 1963. The program includes worker exposure monitoring, regular medical surveillance, and worker safety and health training. Extensive efforts have been made to reduce both exposure and emissions. 2- - ASBESTOS CONCENTRATION MEASUREMENTS The main emphasis of the industrial hygiene program is on worker pro tection so the great majority of the airborne measurements are made in the direct proximity to the workers and are generally within the mill. Rather limited sampling has been included, however, at the fence lines and occasionally at various places closer to the mill building. These external data are provided. Seven sets of area samples have been collected over the years at the mine. With one exception, these were all in the immediate vicinity of active mining and milling operations. They are provided with the understanding that they are not property line measurements. From 1963 through early 1969 concentrations were measured with the midget impinger. The NIOSH phase contrast method was adopted in mid-1969 and is still in use. No measurements have been made with electron microscopy pro cedures. When the change from midget impinger to phase contrast microscopy was made in 1969, a rather crudely documented conversion factor of 2 fibers/cc >5y per million particles per cubic foot was developed from comparative measurements. It is both well known and obvious that the conversion from particles to fibers is not a universal factor but will be considerably influenced by the characteristics of the dust cloud being sampled. A wide range of factors have been proposed for this conversion. Since the value of 2 falls within this range and since there is no basis to adjust it to any other value, it has been used in reporting the present data. AoBsa RESULTS AND DISCUSSION -3- The airborne concentrations measured from 1963 through the present in the vicinity around the mill are summarized in Table I and are shown graphically in Figure 1. A layout of the mill property is provided in Figure 2. Figure 1 gives the airborne concentrations, expressed as fibers/cc >5u. as a function of the month and year in which they were measured. The place where the measurement procedure was changed from midget impinger to optical phase contrast is also indicated. Most of the data were taken at the property boundary with that from the north fenceline indicated by an open circle and that from the south fence line by a triangle. For several of the later years a substantial number of samples were collected in close proximity to the mill and these results are shown by the solid circles. A very approximate trend line has been included on the Figure. It is immediately evident that a reduction in concentration of about three orders of magnitude has been made since the plant started up in the early 1960's. The fence line levels are now generally below 0.1 fiber/cc which NIOSH has designated as the detection limit for the method^As might be expected, the levels directly around the mill tend to be higher than the fenceline but are still quite low. The data for the concentrations during the mining and hauling of asbestos ore are shown in Table II and Figure 3. It should be reiterated that these are not property line concentrations but were measured during active operations. Here there has been a reduction in concentration of approximately two orders of magnitude. The levels are now well below the current occupational standard of 2 fibers/cc >5y. ^ ^These data are included even though there are serious technical reservations regarding the reliability of the measurement method at this apparent concentration level. This is not the place to address this critically important issue. t & 3 AOQqq| r Sample Location North Fence Lint Snuth Fence Line Mill Or. Stockpile Parking Lot Sarnie loc.tlon Nortti F.nct Lin. South Fence Lin. 13 Scot. Mppcf* w f/cc**' - - 1.7 1.4 -- TABIC T AIRBORNE AREA FIBER CONCENTRATIONS Jan. 1966 March Mppcf Usa Mppcf f/CC 22.7 24.1 - 4S.S 48.2 -- 1.8 7.6 7.0 14.0 2.6 5.2 3.2 6.4 m m 1967 Aun. Mppcf USS. m 16.7 18.2 33.4 36.4 m m Jan. 1968 Dec. Mppcf f/cc Mppcf US1 - 6.6 13.2 4.4 8.8 - __ mm m. Jan. HpocftT) f/cc(Z) 4.3 8.6 3.4 6.8 1969 feb July Mpxf lisa f/cc*31 4uo. Sept. lisa f/cc Act. f/cc Dec. f/cc 4.8 9.6 6 3 7.S 3 3.5 2.5 2 3.5 3 Jan. lisa i i kT f/CC 2 1 June usa 2 1.5 m 1970 July i i Aug. usa 0 i Sect. Act. f/cc usa 1.5 2.5 2.5 2 Sample Location North Fence Line South Fence Line South Edge, Tailings Dam Southeast Edge, Tailings Dam Product Storage Area Hill Ore Stockpile 1971 4ell Aug. Sept. Oct. NOV. f/cc Usa f/cc f/cc liss. 2.5 2.5 4.0 6.0 2.0 3.0 2.5 4.0 3.5 2.0 1972 MrFeb. Har. T7cc T7cc tit Sept. Oct. bee. f/cc Sec ZZsa 2.0 - 3.4 0.5 0.17 0.17 0.06 l.S 0.4 5.1 0.3 0.07 0.06 0.24 1973 Jan. Oct. ms. TUL 0.03 0.32 0.21 Feb. USS. . . Mar. ms. Apr. ms. . 0.5 1974 Sir June Ulc. T7cc m 1.7 0.17 July f/cc 0.19 Sept, f/cc Urn. 0.31 m m m1.0 2.2 0.3 1.7 0.7 Sample location North Fence Line South Fence Lint 1975 Usa 0.02 0.07 Perking Lot Beck of Melnt. Shop East Corntr of Hill (RG-244) Nett Side of Mill (RG Surge Tenk) West Side of Mill (Mein Begger) Southeast Corntr (Gas Mtttr) Electric Substation North Loading Dock (S. Side) North Loading Oock (N. Side) 1976 July Usa - 0.08 0.30* August f/cc f/cc 0.08 0.1S -0.20 0.22 0.41 0.18 0.19 0.80 - - T/CC 1977 October f/cc f/cc f/cc 0.07 0.04 0.04 0.09 - 0.03 0.02 1.17 0.07 0.07 - 0.19 0.20 0.78 - o.os 0.09 - 0.08 0.25 0.07 - - F/cc 0.06 - - 0.12 0.10 - F/cc 0.06 0.08 0.10 0.06 - - - 1978 Usa 1979 Aug. usa - - - - - 0.31 0.04 O.OS 0.03 1980 Mar. f/cc - - - - 0.02 0.03 0.04 0.01 Near Water Tank 1. Mppcf Hill Ions of particles per cubic foot. Measured by midget Inplnger. Conversion factor of 2 Mbers/cc -5w per million particles per cubic foot used. 2. f/cc Fibers longer than 5 Microns per cubic centimeter. 3. AH counts After July 1969 ere b> mrnt'rane filter method, A 09 662 io * ucc ?/V 409663 / n r / ,m 3 /qc+ <s> / f i r // 966 t r o t / i c f /q ro 9 7 / / ? / * /? 7 3 1974- 97s- /7 7 i 7 7 7 TABLE II AIRBORNE CONCENTRATIONS DURING MINING AND HAULING OPERATIONS Samplinq Location and Operation SEPTEMBER, 1963 Remarks Mppcf^ ^ f/cc( Alongside wobbler during loading trucks. Variable wind direction and speed so that sampling location is upwind of dust part of time. 4.2 3.8 3.3 3.9 8.4 7.6 6.e 7 . Riding caterpillars cleaning mine site. Much large, nonrespirable material noted. 9.6 10.9 11.3 11.8 19.2 21 .2 22. ( 23. ( Walking across ore pile. Light breeze (5 mph) from west and south. 3.2 3.4 6 .< 6.i Riding pick-up with windows open Deep dust on portions of road. 4.7 9.* on road from mine. 6.0 12.1 JUNE, 1966 Beside operator of front loader (no cab) loading ore truck. Contractor operator. 26.0 52.( Area around truck during loading. Visible dust. 15.4 30.1 General area around grizzly during truck loading. Much loose, finely divided material on ground. 14.2 28. AUGUST, 1967 Beside operator on caterpillar while loosening ore pile. Not visibly dusty nor very windy. 6.3 12.( 5.0 10.( Beside operator on front loader while loading grizzly. Conveyor system operating. Visibly dusty but not very windy. 18.0 15.1 16.7 36.i 30.; 33.- OCTOBER, 1967* Self-propelled. Short section of haul road dry and dusty, no wind. 4.4 8. Scraper, mining and stockpiling ore 4350 level. Road freshly watered, no wind. 2.9 5. Bulldozer ) Push loading scrapers) Ore, 4350 level ) Bulldozer clearing rocks from pit floor. Freshly exposed ore, not watered. no wind. Pit floor, not watered, no wind. 3.0 3.4 3.9 4.0 6. 6. 7. 8. Front end loader ) Feeding screening plant) Maneuvering area watered several hours earlier, very light breeze. ^Millions of particles per cubic foot. to\ ' 'Cihofc/rr A cr>nvpr<;ion factor nf ?. f/cc >5u per 3.7 7. 3.0 6. A066 t) TABLE 11 Page 2 (October 1967 - Continued) *The following description of dust control practices in effect was contained in the re port of this survey: "The sampling was conducted on the afternoon of October 25, 1967. All samples were collected adjacent to the operator of the particular equipment while performing normal operations. All haul roads and the front end loader maneuvering area adjacent to the mine stock pile had been watered in accordance with standard practice during the mining operations. It has been practice to water down the front end loader maneuvering area on alternate days pending repair of the air conditioning system. During mining operations it is practice to have a water truck on duty continuously to water mine haul roads, dump areas and the loading area adjacent to the mine stock pile and screening plant. Scraper loading areas were not watered since the freshly exposed asbestos ore is damp. Watering overburden loading areas, however, was found at times to be necessary due to visible dust concentrations." Sample Location and Time 1. Front end loader screening ore - 10:10 a.m. 2. At picnic table - 10:19 a.m. 3. Same as #1 - 10:48 a.m. 4. Same as #2 - 10:55 a.m. 5. On Cat pushing ore. 6. By oil shed - 12:25 p.m. 7. Same a: "5 - 12:25 p.m. JUNE, 1972 Conditions Slight overcast - wind 10-15 mph from north ground and ore damp cab open on loader - operator wear ing respirator - water truck work ing in area. 70F - cat working on pile. Same as #1. Filter stained by diesel smoke from loader. Same as #1 . Same as #1. Filter stained by diesel smoke from loader. Same as #1. Wind 10-15 mph fron north. No machinery operating - ground damp - 78F. Same as #6. f/cc 1.14 0.42 0.86 0.68 0.86 0.48 0.50 A TABLE II - Page 3 my. 1974 Location, Time, Min. of Sampling, & Temp. 1. Mine pit area, east side, 11:05 a.m., 65F, 30 min. Conditions .1 Clear day with east-west intermittent wind about 5-10 mph. f/cc 1 .70 2. Full mining operation. 2. Mine pit area, west side, 11:45 a.m., 65F, 15 min. 3. Screening area, 12:35 p.m. 65F, 30 min. 3. Sampler hand carried around the area. .1 Same as above. 2. Sample was taken for 15 min. be cause mining operation was stop ped for lunch break. .1 Full screening operation. 2. Clear day with intermittent wind, east-west, at about 5-10 mph. 2.46 -0.90 3. Sampler was hand-carried around the area: 0-10 min. -- Loading section 11-20 min. -- Screening section 21-30 min. -- Stockpile section 4. Full loading operation in hauling trucks. Note: Visible dusts were observed during the loading and screening operations, but the dust could be too big and heavy for the sampler to collect with face down. 4. Top of ore stockpile, 1:10 p.m., 65F, 30 min. 1. Clear day with intermittent wind of about 5-10 mph, directions changed to west-east. 0.90 2. Full mining operation. 5. Top of future stockpile, 1 :55 p.m., 67F, 30 min. 1. Same as above. 1.60 TABLE IT Page 4 AUGUST 9. 1977 Subject: Location: Conditions: Area Samples i . Joe 5 Minesite (see sketch for Location). s1) Full screening operations. Dozer operation on stockpile. Ore truck loading. 4) Moving oversize material. 5) 2-10 mph intermittent wind (use wind meter). 6) Weather temperature of 92 F. Remarks: The Joe 5 Mine area has been extremely dry since 8-1-77 because of the exhaustion of the "normal" year arround water supply. The Location of today's samples (see sketch) are such that maxi mum dust conditions exist whenever traffic passes. Sample No: Time Remarks 1-1 11:10 AM-12:10 PM 175A performing +1" rock removal; pick-up traffic, (none*) 1-2 12:10 PM- 1:10 PM Four ore trucks and 2 loaders passed; dusty conditions, (none*) 1-3 1:10 PM- 2:10 PM T^o ore trucks passed; 125A loader perfor ming +12" rock removal, (none*) 1-4 2:10 PM- 3:10 PM 125A performing +12" rock removal, (none*) f/cc 0.23 0.65 0.70 0.29 Average :0.U7 2-1 11:15 AM-12:15 PM 175A performing +1" rock removal; pick-up 0.30 traffic, (none*) 2-2 12:15 PM- 1:15 PM 5 ore trucks passed; 175A loader loading 0.6l trucks: possible Diesel exhaust with sample, (lots*) 2-3 1:15 PM- 2:15 PM 1 ore truck passed; same as above, (little 0.43 to lots*) 2-4 2:15 PM- 3:15 PM Light traffic (Pick-up), (none*) 0.37 Average: 0.43 (*) filter discolored from diesel smoke. A0eea Sa m \PUs -fe te /o a . T i . ^ Ife Pus,T1qo . A) TABLE II - Page 6 AUGUST 19. 1977 Subject: Location: Conditions: Area (3) air samples Joe 5 Pit (see sketch) 1.) Full screening & Truckloading operation. 2.) Dozer operation on stockpile. 53. Approximately 5 mph wind with gusty to 10 mph. 4.) Temperature 90 F* Remarks: Sample No. 3, upwind, approximately mile southeast of Joe 5 Pit center. Approx, elevation 4400'. Sami '1 e No. Time Remarks 1-1 11:20 AM- 12:20 PM No traffic. 1-2 12:20 PM- 13:20 PM Light traffic within 50'. 1-3 13:20 PM- 14:20 PM II M II II 1-4 l4:20 PM- 15:20 PM No traffic. 2-1 11:25 AM- 12:25 PM No traffic. 2-2 12:25 Hi-13:25 PM Light traffic within 100'. 2-3 13:25 PM- l4:25 PM II It II II 2-4 14:25 PM- 15:25 Hi No traffic. 3-1 3-2 3-3 3-4 11:40 AM- 12:40 PM 12:40 Hi- 13:40 PM 13:40 PM- l4:40 PM \4: >40 PM- 15:40 PM Dormant area. hill ton. II It II II It 11 If ft ft II II f/cc 0.27 0.38 0.20 0.14 Average: 0.25 0.12 0.13 0.34 2i?2 Average: 0.22 0.16 0.10 0.12 0.05 Average: 0.11 (JC ! 40-2 SNTERNAL CORRESPONDENCE METALS DIVISION To (Name) R. E. Byrne, Jr. Division G. L. Dickson Location T. P. Norris J. E. Walsh Copy to B. L. Ingalls J. J. Sibley F. L. Smith H. B. Rhodes File P. 0. BOX 579 * 4625 ROYAL AVE.. NIAGARA FALLS, NEW YORK 1- Oate July 29, 1980 Originating Dept, "Calidria" Asbestos Answering letter date Subject Dust Count Reports Effective immediately, all dust count reports for your customers will be sent to you for distribution to the appropriate person in the company involved. It is desirable that you hand deliver the report rather than mail it. Upon delivery of the report, please send a letter to Blair, with a copy to me, confirming the date of delivery and the person to whom the report was delivered. Blair will file your letter with the dust count report and my copy will be placed in the "permanent" file. A copy of Blair's or Fred's letter transmitting the report to you will also be placed in the "permanent" file. JLMidal A09672 To: R. E. Byrne, Jr. B. L. Ingalls^ J. L. Mye^*^ Copies: Fil TECHNICAL SERVICE REPORT Union Carbide Corporation Metals Division P. 0. Box 579 Niagara Falls, New York 14302 Date: July 18, 1980 Author: F. L. Smith NB File No.: 2332-42-44 Fiber Identification as a Function of Sampling Time Introduction REVISED 7/30/80 Interest has been generated in ascertaining the effect of long term air monitoring (up to ^16 hours) on mi Hi pore filter loading and readability in determining airborne mineral fiber identification. The following aspects were investigated: 1) Filter background particulate interference on samples collected outdoors at UCC Metals, Niagara Falls, NY, for periods of 4, 8", and 16 hours. 2) Filter background particulate interference on samples collected indoors at UCC Metals, Niagara Falls, NY, for periods of 8 and 16 hours. Summary and Conclusions Samples collected- by the membrane filter method outdoors are limited to hours sampling time. Due to extraneous airborne dusts and organic material the filter background density increases to the point the mineral fiber may be obscured. Samples collected indoors in two selected laboratories at UCC Metals, however, show a lower density of background particulate and exhibit better clarity. Fiber identification is possible with sampling times approaching 16 hours. FLS:dal Attachment 409673 i Samp! e F-44 F-39 F-48 H-18 F-49 H-l 1 F-29 Summary of Air Monitorings Location Outdoors - South fench of research parking area. Same as F-44. Time 255 min, 4.25 hrs. 445 min. 7.4 hrs. Same as F-44 948 min. 15.8 hrs. Indoors - dust count lab #205. Located above air conditioning control. Same as H-18. Indoors - Lab #118. Located above-cowles mixer, north side of room. Same as H-l1. 450 min. 7.5 hrs. 865 min. 14.45 hrs. 443 min. 7.4 hrs. 865 min. 14.45 hrs. Remarks Very lightly loaded. Density * ^50 particles/ field Moderately loaded but readable. Density = 50-200 parti cles/field. Many spherical parti cles evenly distributed. Density = >300 particles/ field Mineral fiber difficult with this loading. Very lightly loaded. Density =<15 particles/ field Many fine particles but readable. Density = ^200-300 particles/field Very 1 ightly loaded. Density = <15 particles/ field Many particles but readable. Density = ''-200-300 particles/field