Document jBzy46aVp6JogXLXbq2n0zE1p

FILE NAME: Phenolic Resins (PHR) DATE: 1972 Feb DOC#: PHR049 DOCUMENT DESCRIPTION: NIOSH Report - Special Asbestos Dust & Preliminary Industrial Hygiene Survey; from ABEX File SPECIAL ASBESTOS DUST PRELIMINARY INDUSTRIAL HYGIENE SURVEY ABEX CORPORATION American Brakeblok Division Winchester, V irginia Survey Conducted By: John Dement Patrick Shuler Ralph Zumwalde Report Prepared By: John Dement Patrick Shuler Environmental Investigations Branch Division o f F ie ld Studies and C lin ica l Investigations Rational In stitu te for Occupational Safety and Health. 1014 Broadway Cincinnati, Ohio 45203 February 7-11, 1972 INTRODUCTION During the week o f February 7-11, 1972, a special asbestos dust survey and a preliminary in d ustrial hygiene were conducted at the American Brakeblok Division o f the Abex Corporation, Winchester, V irg in ia. The main purpose o f the asbestos dust survey was to evaluate the asbestos sampling technique used by the U .S. Public Health Service. To date, the samples which were collected have not been analyzed; how ever, from past U .S .P .H .S . surveys and the present in d ustrial hygiene survey, several conclusions can be drawn. The following paragraphs discuss plant operations and in d u strial hygiene practices along with conclusions and recommendations. DESCRIPTION OF THE PLANT The plant is located south o f the c ity of Winchester and employs approx imately 655 blue co lla r workers and 119 white c o lla r workers. There is a doctor employed by Abex Corporation but he only v is its th is f a c il it y once or twice a year. A nurse is on duty f u l l time however. A complete pre-employment physical is given and is repeated every two years. Chest X-rays are taken every year. Blood and urine samples are taken twice a year from those in the mixing area to check fo r lead. Abex employs an in d u strial hygienist f u ll time. The Personnel Manager acts as the Safety Director and works through the foremen to implement safety programs. The plant was constructed by Abex in 1947 for the purpose o f manufacturing asbestos fr ic tio n products. The to ta l plant s ite consists o f 44 acres with four main buildings amounting to 440,000 square fe e t. The buildings are two story structures with the mixing operations and dust co llectors being located on the upper le v e l. Products o f the plant include automotive, a ir c r a ft and in d u strial braking m aterials, ABK in d u strial bearings, and sin tered .m eta llic material for production o f m etallic fr ic tio n products. Approximately 50 d ifferen t braking material mixes are made by the company in order to comply with varying customer needs and s p e c ific a tio n s. DESCRIPTION OF THE PROCESSES Both extruded and dry process brake lin in gs are made along with ABIC bear ing m aterial. Sintered m etallic m aterials are made in a separate building and does not involve the use o f asbestos. The following paragraphs give a b r ie f description o f the operations which make use o f asbestos fib e r s . A. Dry Process Brake Linings The process by which dry process brake lin in gs are made consists o f the following steps: 1. Mixing 2. Preforming and Blending 3. Hot Pressing 4. Cutting and Trimming 5. Curing 6. Final Grinding and D r illin g Raw material mixing is done on the second flo o r . The various raw m aterials used in each mixture are dumped into a "Nauta" type mixer which thoroughly mixes the materials and empties to conveying carts on the f i r s t flo o r . A fter the m aterials are mixed they are taken to preform stations where i n it i a l forming takes place. Preforming consists of placing a pre scribed amount o f mix into a mold and pressing with a hydraulic press u n til the m aterials clin g together as one mass. Following the preforming operations, the brake blocks are placed in a hot press for a period o f approximately two hours. Hot pressing serves the purpose of allowing the resins to further bond the materials into a rig id body. F in a lly , the blocks are ground to the proper thickness, d rille d with the proper h oles, inspected and packaged fo r shipment. Blocks are labeled with a brander machine. B. Extruded Brake Linings Extruded brake lin in gs are made in the following steps: 1. Raw Material Mixing Grinding . 2. Extruding 3. Baking . 4. Cutting 5. Final Curing 6. Final Grinding and D r illin g Raw material mixing is done in a manner sim ilar to dry process lin in g productions, the only d ifference being that o ils are added to form a damp paste. A fter the m aterials are mixed, they are emptied into conveying carts on the ground flo o r . A fter mixing, the raw m aterials are extruded in the form of a tape which is wound into a c o il. The co il is then placed in an oven for in itia l curing. Following the i n it i a l curing operation, the co ils are surface ground and cut to length on band saws. Depending on customer sp e c ific a tio n s, the lin in g may undergo another curing operation. F in a lly the lin in gs are d rille d with the proper holes, fin ish ground, inspected, and packaged fo r shipment. C. ABK Indu strial Bearings ABK in d u strial bearings are special wear and heat resistan t bear ing made by the company. The bearings are made by f i r s t impregnating a cloth with various resins and then winding th is cloth or hot press ing i t to form the product. These bearings are used quite extensively in iron and stee l foundries. SURVEY PROCEDURES The main purpose o f the asbestos dust survey conducted at the plant was to evaluate the asbestos sampling technique currently used by the U .S. Public Health. Service. To do .th is , simultaneous samples were taken C'85 p airs on the same side o f the man and 23 sets on opposite sides) to check the rep ro d u cib ility o f the asbestos sampling under fie ld conditions with r e la tiv e ly low concentrations. The majority o f the sampling_was conducted at the same machines in the cutting, grinding and d r illin g o f auto lin in gs fo r three consecutive days on the f i r s t and second s h ift in order to also supply data on variations o f concentration o f asbestos with the s h ift and day of week. The remainder o f the samples came from the preforming and hot press, areas. A special study was done to determine the e ffe c t o f heavy background on sample re s u lts . A preliminary in d u strial hygiene survey of the plant was also conducted to try to evaluate general housekeeping and v e n tila tio n system s.. INSPECTION OF THE PLANT Potential Health Hazards: The major potential h e alth hazards encountered were ; 1. Exposure to asbestos dust 2. Exposure to lead from mixing operations Caution needs to be exercised toward some of the raw m aterials (see Table 1) that are encountered. Indiscrim inate use o f such things as carbon black, lith a rg e , and hexamethylenetetramine would be haz ardous. Also, noise levels could be excessive in some areas. Personal Protection: The only worker in the plant seen wearing a respirator was in the hot press area. Safety clothing such as rubber aprons and ear protection are provided where appropriate. Safety glasses are required o f everyone inside the manufacturing area. There is a program to finance the purchase of safety shoes, but th is is voluntary. V en tilatio n : Local exhaust ven tilatio n is used quite extensively with ductwork at almost a ll operations. The contaminated a ir is vented to 22 American A ir F ilte r "Roto-Clone" type "N" wet dust co llecto rs with a to ta l design capacity of 314,740 cfm. Design sp ecificatio n s are given in Table 3. None of th is a ir is recycled. The sludge from the wet co llecto rs is taken through a series o f three s e ttlin g ponds to clear the water. A pumping station is located at the la s t pond to recycle some water. The water is evaporated and absorbed so none of i t is allowe outside company property. Sludge is cleaned from the ponds about once a year and piled in mounds on company property. W o l ' O t i v \ > I 'lU lV W fc* pressure inside the plant. 155,000 cfm from 10 u n its. t not enough to prevent a noticeable negai The- to ta l capacity o f the make-up a ir is V en tilatio n layouts o f areas sampled during the special survey are shown in diagrams 2 and 3. Table 4 gives the resu lts o f the ven tilatio n survey. The method used to make the mixes is good in that raw m aterials are not handled by hand. A cart goes down a r a il and under a series o f hoppers each containing a part o f the mix. The mixer stops the cart at the appropriate hopper and puts in that chemical. Each hopper is ventilated in d iv id u ally . The nice part about th is system is that the chemicals are loaded by vacuum lines into the hoppers. Unfortunately asbestos cannot be included in th is method since i t is not a loose powder and is broken in to the mix cart at the end by hand. I t appeared that the co lle ctio n and disposal part o f the ven tilatio n system is adequate and performing as designed, but improvements could _ be made in the duct work and esp ecially the hooding. The duct v e lo c itie s are quite high, but more emphasis should be placed on using enclosed or flanged hooding as near the source o f dust evolution as p o ssib le. Housekeeping: In general the housekeeping was good. There is usually s u ffic ie n t space in the aisleways. Painting and a general cleanup was in progress during the time o f the survey. Brooms and a large vacuum floorsweeper were used for cleaning. The major problem in housekeeping was the frequent use o f compressed a ir to blow o ff machinery. CONCLUSIONS AND RECOMMENDATIONS From th is and past surveys, i t appears that the areas of p o ten tia lly excessive asbestos dust exposures are the mixing and preforming areas. The following are recommendations for some changes which are necessary to improve conditions at the plant: 1. A method needs to be developed for loading asbestos into the mixers which would eliminate hand loading. Until such a method is developed, asbestos mixers should wear Bureau of Mines approved respirators. I 12*4 2. V en tilation improvements are indicated at the preforming statio n s. One such improvement would be to place hoods closer to the area of dust generation and use a more enclosing type hood. Another method would be to automate the block preforming operation as has been done for disc brake preforming. . 3. More make-up a ir should be provided to prevent ven tilatio n systems from being starved for a ir . 4. Once the m odifications have been done on the ven tila tio n systems and the systems are balanced, a ll b la st gates should be welded in position to prevent them from being altered . TABLE 4 1 2 3 4 5 APPEN D I X TITLE P o ten tially Hazardous Raw Materials Abbreviations Used in V en tilation Diagrams Dust C ollector Design Data Results o f V en tilation Survey Results of Past Surveys ' FIGURE # 1 2 3 ' TITLE Diagram o f Plant Layout V en tilation in Preform Area Ventilation in Finishing Area TABLE I POTENTIALLY HAZARDOUS RAW MATERIALS USED BY ABEX CORPORATION AMERICAN BRAKEBLOK DIVISION 1. Asbestos Fiber 2. Litharge 3. Lead Powder 4. Hexamethylenetetramine 5. Phenolic Resin 8 Polyrez Resin 6. Paints 7. Carbon Black 8. Coal 9. Zinc Dust 8 Zinc Powder 10. Nuisance Dusts ' TABLE I I ABBREVIATIONS USED IN VENTILATION DIAGRAMS Abbreviation DP EG MD PF R S SG Meaning D r ill Press Edge Grinder Multipress D rill Preforming Station Ripper Band Saw Surface Grinder The following ventilation diagrams use the above codes and denote where the sampling was done during the special survey at Winchester in the preforming and finishing area. TABLE I I I WIHCT'ESTER DUST COLLECTORS " 1" " ----------~~~ See P5-W404____________ . . . . J5NGIMEEDIHG BULLETik - vL9_____ - . .............. #A"4L'J.Vj ii Co fl\oJTt'i! ______ :______________ ----- ----------- -- / Po Department rUJ Served a Co p O 3757 i Balcony 5.3 K 6 -------i- 2nd 6JE7 3 2nd 8 J':i9 4 2nd hjr.9 5 2nd c.iiOJ * 2nd 10 Q:lL 1 V Balcony IC q u l1 o Balconv i 9 GZZA7 Strip Fin ish in g It II Wet Compounding C ld le ) ' J Co.mounding Block Compounding Block Preform ing Block . F in is h in g 0N) 1i iH | <D p` & h !! \rc 16M 60 11 60 i: 50 it 50 20W 40 16N 50 16N . 60 16N 60 16N 50 K otor PU 1200 1200 1800 1800 1200 1200 1200 1200 1750 ii 16:: -17 l!-=- _ T3l'Q14 A. B .K . P ilo t .. 20 k 75 I!;----\-?- T23nd:ij n r PC]ondn t 12W 10 13 Grinding 6K 15 1 12ADAE1 s B lan k et ! 14 Preform ing 1.6M 50 7ZZA8 Clock i 13 Fin 5.si lin g 16M 50 | GZZA7 Hock ! io i Fin i sh in s Il j"7ZZ7vo aldcu i 17 Fini ailing i j oC0 / c r ip 1 18 l Balcony F in is h in g `i Blam-tet 1 20 M 60 20M 60 2CM |so i1 1F> ! j P reform in g 16N |50 1750 1160 1725 1750 865 1750 1750 1800 1800 O =""t rl to ^ i-1 o ' r-* ~u Vj Uo Cj o <1 H O pi 8- }A *<-1 Fan U-t o l \A i4CtO -U -HO AV Q<LZ W,A H<D 4J -d>f C<u`.i Mp rUo ___in> Pump raA Pi COJ P2 75 18 1042 16.000 6 .1 5 2L6-CDQ 5 70 1042 1 6 ,0 0 0 6 .3 4 B-6-6 5 66 60 1039 1015 16,000 5 .0 l 2L6-CDO 5 15,000 3.5 B -6 -6 3 1430 9.200 5 .4 G ra v ity 65 1074 15,000 5 .0 B -6 -6 5 65 8 1160 1 5,9 40 5 .2 K 2 65 8 1008 16,500 3 .6 4 B -6 -6 5 63 17 1060 16,000 7 .2 5 G r a v it y Drag 90 1 1 2 1 _ 2 2.0 00 .6,JLiL_. 8... O u t_____ 12- 2150 3.000 4 ,1 G ra v ity 14 1480 5,500 6 .0 2L6-CDQ 5 65 16 1042 1 6,0 00 4 .8 6 7 2I.6-CDQ 5 52 17 1039 16,000 3 .8 8 9 G r a v it y 68 17 _1.07.1_ 2 3 ,0 0 0 5 .8 4 __ .16 G r a v ity . 58 17 1073 2 0,3 00 5 .0 4 6 G r a v it y 18 1073 2 0,3 00 6 .4 2 1/7 2L6-CDQ C J 55 16 1042 1 6,0 00 5 .4 2 10 l2L6-j|CDQ 5 ii !iit . ii JR S . ^ !' F i l e sC 1 ' # 06 t W-10 1200 950 1800 !,- l l J i 1 ! i -lie i ! -11D 1800 I -11 .. 950 ' 1200 . 1200 i 1 - 1 1 _ V i'i -11 1 j -11 1 -11F -H E -U A i 1800 -10 1200 -14 -15 li ! -16 1 1r.164 1200 | -16B 1200 j -160 r-i &0 UO -rP4 UC cd * OO (vd* uy U228 Sh 6 1 W228 Sh 3 V7228 Sh .4____ W223 Sh 3 H IT W2 2 8 Sh 5 It II i 1 o O TC3J 1( P o -3 c %< J; p* tc H C U H j--J o ^ 5 e--g i a. c > Ta-l 4nJ o i rO-l rU) i;ii| ^o c r-l 0 S oc o if n jr---- a :---- =r.V1 ra ^ j " =:` !i W405 Sh 24-3 '7 0 j '61 W405 Sh 2 ' 70 1 '60 O :. H405 Sh 3 >1 '70 '55 3 5 M214 Sh 1 '55 W219 SU .,2 .^ J.5 5 If A . ! _'_55 !! , J . _ !i!i . *55 W405 Sh ] 9 '55 >..'405 Sh 13 '6 7 W405 Sh 14 . : 67 VJ405 x / S.h,. J-6__ .. 1.67 W26o SBlJ L . . _ `-55. ' 1 i ' 59 W405 Sh 7 '67 >3405 . Sh 14 ` 67 H / /55 / ' 64 -16.6_155 159 '63 '63 ! 5 ! -l ! - 3 !! 9 l ..10.) L ai! Laj 1 ! !i 1 15 1 1 l II VJ4D3~ Sh 2 ic4 Sh 7 J-.67 !. ! i I i ji 1 167 1 166 ULll! '7 0 ! *70 ! i s : * ; '67 | '66 Collector it Location TABLE I I I (continued) Type Motor H.P. Fan C.F. M. Design In let Static 20 New Addition 16 N 50 16,000 4,69 21 M etallic Sintering Building 4 N 4,000 2.50 22 New Addition 20 N 60 20,000 4- 6 Total Designed Exhuast Volume - 314j 740 afin TABLE I V RESULTS OF VENTILATION SURVEY Machine Machine Code M ultiple D r ill #4 M ultiple D r ill #5 M ultiple D r ill #6 D r ill Press #5 D r ill Press #8 Surface Grinder #4 Edge Grinder #1 Surface Grinder #5 Surface Grinder #6 Lining Ripper #1 C u t-O ff Saw #1 C ut-O ff Saw' #3 C ut-O ff Saw #4 Preform Station #1 Weigh Station Overhead Preform Station #20 Weigh Station Overhead MD- 4 MD- 5 MD- 6 DP- 5 DP- 8 SG- 4 EG- 1 SG- 5 SG- 6 R- 1 S- 1 S - 3 S - 4 PF- 1 PF-20 ' Hood Type Volume CFM Duct Diameter Vented to Collector $ Underneath Underneath Underneath At D r ill At D r ill Wheel Underneath Underneath At Wheel 8 t J ~ -L-I-- . u u u v x iic a h i At Wheel 8 Underneath Underneath Blade 8 Underneath Blade 8 Underneath Blade 8 Underneath Slot Grate Slot Grate 315 438 411 151 151 223 751 771 680 --- 813 1297 522 1269 166 416 250 700 5" 2 5" 2 5" 2 4" 18 4" 18 46"" 18 6" 18 7" 18 7" ' 18 5" 2 5" 3 5" 3 5" 3 110"" Xx 1155"" . 19 110"" Xx 1155"" 19 TABLE V Arx-rlesn Uni Chea Ccerpany , pCSI& t oi` A ir Evrnles ci' Uo^t-osuer# l'in cbcsto r, VAripii'da Friction Operation 7:~rv '\"cr Sssaple i{ rrysxf! '^.r'br'r.r:'! FAIter Caspio ii- Tc-tai a* lA >5y FSirir." ft Cestne Ga;::r>ouridc:r-*33 116 0.7 107 0.2 202 0.2 12? C 3 Pc:rcon?X Y7ocior~I.7* 10 o.U 200 0.7 Percolai Auto H eller Cpc: 3Z Person*;! 0 .3 *`o E3 f 106 203 130 2? 70 20$ 206 209 U 201 3 8 207 Uh 22 2$ 20 27 23 0 0 0 . 0 1,9 0,$ C ,6 0.5 Od). V'2 7.0 3.1 0.6 0.5 0.2 1 .6 1.2 C..$ 0,3 0.2 0,J. 0.2 0.1 C*1 0 0 6 ,8 2,5? 0.7 0.7 0 .? 1 ,1 1.4 0.6 0,2 0.6 0.2 3 .0 2.5 l.U 1 1 .0 0.0 1 .5 1 .2 O.7. 1 .3 1.0 o . r 0 .5 0.4 0.2 2.9 2.4 0,8 0 .7 0 .6 O.ij H ES CSI AKJarTX-'vTlOT Personal" rotors to "e i!p"n ye tea's '<.o brer, vi'an ,;6cr:." r c lc r s te \r\r.o~c .s i sradico cn rconbrono f i l t r o ,, _ s ycr.olc:'. by companion ir x tr r o r <i nu~.*i~ -r-l.-o -.-?,AU '.r '.1 ',,.Ai * ,, f-ir tia 'e lif cUmcUicr.b 2 American EraJ;y Shoe Coi. any Operation ;V'07? SciaplC }r lTTPn?c* * '/. .* >v f . v * r >5p Kisdns & Coating - Continued Auto H olier C-psr* -- Re:rsonal (Cor t `d.) Hand R o lle r-- Personal Sv!?oepr.r--Pers oriel S ervice ran-- Personal Q u a lity Control-- Ferrer * Preform-- Personal Forming Hand E o ll Operator--32 13? Radius R o ll-- PC 353 2?1 Personal Preform Operator-- B3 ft 137 . - ' 153 125190 211 212 13 212; 19 20 21 7 0 .4 DiO o.H 3?4 0 .6 '49?. 293 297 3U3 1 .3 52 1 .2 136 0 .1 0 .3 0 .0 0 0.0 0 25 .0 0.9 0 .1 n.9 2 .li 1 .6 0 .5 osO',.th,\r\j Pol 0 .5 \r.i * 35*6 1.1 0 .1 0 .6 0.6 0 .2 0 .7 0 .6 C.h "--2 .1 .0 0 .3 . 1 .1 1.0 0 .6 2 .5 0 .6 1 2.9 3 .3 3 .1 o.-'i 2 .7 2.0 1 .0 U.2 1 -4 0 .7 1 .5 o.s 0 .3 3 .1 1 .0 7 .6 1 .6 3 /acricen rako hoo Cwspcny Operation i'rc'.rcle // nppcf Forcing (Confcinnsd) Froi'orc 0perafccr3 (c cr,u *d) Xk7 1.9 163 OjLt 176 3.9 r cnal 0 0 Csyr Hand E o li 0pcrator-~3Z 139 O.U E&clius Eoll" *>2 353 Spi JtCr 0C-..X Prefera Operator--S3 51 1.3 137 1.2 lii7 1.9 162 O.U 176 3.9 oaqpxo 6* pi!5 `.e r T/V; le ta l -X) I1 "r >5y DiB 163 177 t1,0 lU k -11. < 1i 3ti3i. lo lo i UO 3ih 292 293 237 3h3 32 I 3S 133 163 177 11.5 h.5 0 0 3.6 1.0 16.9 9.6 3.9 7.7 Ji.B 5.4 3.5 j t <. V ,/ k.O 3.1 ' D.U 7.0 O*O/ 6 ^ 5.5 3-0 7.1 6.1 r (*1 1.5 1.7 1*0 10,3 9.5 li *6 7.5 6-3 9 2.5 - U 12.9 Jr. t-*'i n C*u 2.7 2- *} ft*"i U.2 1-4 0 .? 1.5 - 5 nw ts 0*. 3.1 7.6 1,0 *1 11.5 k5 0 0 3.6 1.0 rkj I > li * American Brake Shoe Ccspary Operation J 1....I..m......i.r - o r S s a le ir tropc toxrns (Continued) Preform Operator--Personal , Ko;"`errano F ilic i' - i* <" Sample P otar le 1i V >5y W*l 1 !i2 . M 155 l';6 153 i.;3.~f.i4 Xl'J 157 ito l6 i 3.6.9 9.6 3.9 7.7 5.4 3.2 l i .8 3.5 2 .5 l i .8 3.1 1.6 Q Ji 7.0 2,9 6.3 5.5 3.0 7.1 6-1 2.7 1.5 1 0 .- 1-7 111. .%0r'sS 7.5 6.3 ?-,? iot Pressing . Sx.p.c'per--Pcrc cnal C cr^ ccaan --Personal Cinchina Forms" Personal (l'ClP P it toi*) ABK & Press Cmor.--B2 U Book Press C p tr.--*B2 3.85 (Hot). Personal Service lan, Kot Press , Co 9 180 0,1 1 * 1 .. . iiC2 83 Ito ' ie i mi H>3 0 0.1 0.0 .6 -1 .0 0*7 2.8 IcO 1.5 !* 2 0 .? 0 0 1 .6 0.9 5 .3 4.0 1 .5 2.7 1.4 0.6 3? 1.4 0.5 A jerie an Brsfcc Shoe Ceqper&r Operatici' ` 5 * Hot Frcooinr; ( Continued ) Hot J^eso Opor*~"BS 63 l.o ? 3 o .l Personal airing Oven 0n';V~'3w 2l Cc-srvcycj.i* Personal Oven Cpsr. -"Personal U 'V nvnlc # Vi n i '"f'y* ; ..r:y/ .Oi/' 1 1 { >5y a, 7h $3 5? 61 6.2 ' 63 6 5A VO 71 72 79 80 Cl 2 lc3 220 10-i i~o/-r, U03 lo u 0 0 0 .6 0.U 1*8 1.5 3.U 2.5 2 ,5 1.8 rV 0 .1 ri/n/ 5 .0 '2 ,p 2.1 j. *h 1 z 0 2 .2 1..6 0.7 3.3 1.6 W * 3.8 1;.3 3.6 l . J 1.4 U c^> 0 .1 ^1 2 .2 1 .0 0 ,7 0 .5 0 ,0 nc. tOr\ r> C; o5 0 .9 0k, 3/; r.f 1*6 R .2 0 ,6 0 o .a C Ji C .O 1 .2 0 .6 1 .9 1.4 o5 3 .1 jLe2 0 .5 0 .3 O cl I*27lrG2! EM r-~* V %Aw-i iVi. *tj**\ 6 *1'S**+*A`-K `+ **& M *t,***> Chipio ' ppeX r*-*\ v\*1.*.+\+ -. -w mtr-f?-**!*<'*! wW^- .^ . >5y '4* M3<pXJ-v*e5/WUWVtar* .c^ ,c.0:.},j r ii 0-VX,,i .y V***"4-* ^ ^ *'**-w* <*;vv v*w***-*>* /-' 1**,,**'.**;. C-V7'* - 51' ?vwv*.*t/ T"'*<*- P"V''V ^ . "Vt "-.-i Vio*w^a.5-wvi. *.> vi'-/ 2s& x^ria-c;: n ?4253 GpindW K 02 '4^Vv,-v*fc-rif W.N*.*.*'*' 703 Ait- CrArxlo? VY1 TV* -/- '* f^P C c6 C& p Ac3V* 3SI . c r ^ ' W W 4 w>_5*. e t r ip F.tiri>^:'Ci'C.C:-L Turner Q ^ * ~ ? < xcg& . <* f* r < w > CVa /-, *1 V t>X K ,nc O rC 17 1*2 le ? 3 .7 237 r-,Vr. ^2 ( 2 *>- '"v * *> ^ `v/ .r ? ' / r\ '*fv t*(,'/<w0 10 '2 1 i **Vr 0 .0 O J* 355 258 25? *^V / '-i 350 0 ,0 .^* Cvr^' 1 .3 3*2 X e-^ 5 i> 2*1 0 2 ,1 0 ,2 $, I i **-*' iN O W v* ll > **> L* 0 \ 0 .6 b r X ^ 3 .? ?v0 V '** A rv *' C *0 +1 5 .3 3 1 11 0 . 1 .3 0 .9 C .7 1 3 .5 1 .3 121 . 3 .0 3 .5 2 .1 1 . 0 W.' * >' .' 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