Document B8Qg0YLNMdVnBy0knm1mEzj7L

SOLVENTS INDURSTR1AL HYGIENE REPORT FOURTH QUARTER 1985 INTRODUCTION 1985 fourth quarter personnel monitoring surveys were conducted with the cooperation of 13 individuals working in Solvents. No particular job was emphasized, but sampling trended towards operations personnel particularly, outside operators (OT's and SOT's). Also included are surveys on the block millwright and laborer. Sampling techniques were revised in 1985 in an attempt to gather statistics that would correlate HEX blood levels to perchloroethylene exposure.1 The revision consisted of wearing two (2) sample pumps during the survey period, one monitoring for RCL's, the other for HEXES. In addition, there were two (2) excursion samples (T-94, crude V2 tank) and three (3) area samples (T-13 & T-26, D-13, C-59 OH exchanger vent to atmosphere) conducted, and their results are also listed in this report. All samples collected were analyzed for the following compounds: Carbon Tetrachloride Perchloroethylene Propylene Dichloride 2,3 Dichloropropene Ethylene Dichloride 1,1,2 Trichloroethane (B-Tri) The two (2) excursion samples were also analyzed for vinylidene chloride. 1. A separate report will be issued on this item. DO 076947 confiofnttai t MONITORING PROCEDURE Calibrated Sipin SP-1 Personal sampler pumps were employed to monitor Solvents Block personnel. A prepackaged 600 millimeter dual section activated charcoal glass tube* was attached to each pump by a V length of Tygon tubing. The Charcoal sampler tube was then attached to the lapel of the worker to monitor his breathing zone. Each person was required to wear two pumps, as noted in introduction. SAMPLE PREPARATION Samples were desorbed by transferring the activated charcoal from the front section of each tube into a 25 ml glass vial with a mininert valved top containing 10 ml carbon disulfide. Vials were then shaken for 2 minutes prior to analysis. SAMPLE ANALYSIS A Perkin-Elmer, Model 3920 B, gas chromatograph equipped with a flame ionization ddetector was used for the analysis. This chromatograph was interfaced to a Hewlet-Packard, Model 21 MX computer which determined concentrations based on the integrated peak area. Chromatographic constants are as follows: Column: 6' x 1/8" ss 20% tricreasol phosphate on Chromasorb P 60/80 mesh. Temperature: Oven Injector Detector 85C 150C 150C Carrier Gas: Helium Range: XI Sample Size: 2 microliters Elution Times: CS2 Carbon Tetrachloride Ethylene Dichloride Propylene Dichloride 2,3 Dichloropropene Perchloroethylene 1,1,2 Trichloroethane 1.92 minutes 3.62 minutes 6.69 minutes 7.81 minutes 8.51 minutes 10.61 minutes 19.66 minutes *SKC, Lot 107 charcoal tubes, 400 mg front section, 200 mg back section. DO 076948 OONFTDFNTTAl CALCULATIONS The parts per million of each chlorinated hydrocarbon were calculated by the Hewlett-Packard computer. The accuracy of these calculations was verified by daily calibration with known external standards. The parts per million by weight were then converted to parts per million time weighted average exposures by volume using a separate computer program which utilized the following equation: ppm (v) air (wt. of CSs(g)) (.0821)(K) (ppm from chromatogram) (HW) (L) Where: CS2 used for disorption in grams. .0821 gas constant (converts grams to liters). K degrees Kelvin (C + 273) predominant ambient temperature during monitoring period. MW molecular weight of the specific chlorinated hydrocarbon, L liters of air sampled RESULTS AND DISCUSSION The area and personnel time-weighed 8-hour average monitoring data indicated acceptable levels well below the established threshold limit value. More emphasis on excursion monitoring is recommended to better define problem areas and to insure that we are employing proper protective equipment. The data also would serve to encourage the proper use of the protective equipment. DO 076949 CONFTDFNTTAl R CL FOURTH QUARTER 1985 PERSONNEL MONITORING EIGHT HOURS TWA* NAME Chustz, G. Robique, R. McQuarter, J. Theriot, J. Landry. C. Arnold, B. Hotard, R. Anderson, A. Landry, R. Lee, E. Thibodeaux, W. White, H. Hines, W. TIME JOB PER TET PDC B-TRI EDC 2,3 DCP 8hrs P/T O.S. .029 N/D .016 N/D N/D N/D 8hrs Sample O.T. .374 N/D .037 N/D N/D N/D 8hrs P/T S.O.T. .158 N/D .044 N/D N/D N/D 8hrs 1,2,3 O.S. .079 N/D .066 N/D .090 N/D 8hrs Sample O.T. .670 N/D .352 N/D .087 N/D 8hrs 1,2,3 S.O.T .213 N/D .344 N/D N/D N/D 8hrs S/S .143 N/D .042 N/D .118 N/D 8hrs 1,2,3 S.O.T .772 N/D .193 N/D .108 N/D 8hrs Sample O.T. .562 N/D .053 N/D .079 N/D 8hrs 1,2,3 O.S. .216 .991 .125 N/D N/D N/D 8hrs CHL Maint. N/D *3.09 .188 N/D N/D N/D 8hrs Millwright .344 1.33 .481 N/D N/D N/D 8hrs Laborer .230 1.20 .159 N/D N/D N/D AVERAGE .292 .508 .162 N/D .037 N/D *NOTE: 50Z OF TLV IS CONSIDERED DANGER LEVEL, ONE SAMPLE IS AT THIS LEVEL!! DO 076950 nONFTDFNTTAI, R C L FOURTH QUARTER 1985 EIGHT HOURS IUA CONCENTRATION IN AIR (PPMV) AREA SAMPLES AREA TIME PER TET PDC B-TRI T-13 and 26 8hrs 1.76 N/D 1.2 N/D D-13 8hrs .073 .017 .041 N/D C-59 OH EXCH VENT 8hrs 2.53 N/D .793 N/D EOC 2,3 DCP N/D N/D N/D N/D N/D N/D EXCURSION SAMPLES AREA T-94-1 TIME PER 15 min N/D T-94-2 15 min N/D TET N/D N/D PDC N/D N/D B-TRI EDC 1091.68 N/D 282.27 N/D 2,3 DCP V2 N/D 106.43 N/D 57.24 1- Job was hydroblasting T-94, it was shutdown due to insufficient respiratory protection, but was restarted with breathing air gas masks & protective clothing. 2- Next day during hydroblasting 00 076951 CONFTDFNT JA! AVERAGE EMPLOYEE EXPOSURE 1980 - 1985 (Levels in PPM) V2 TET PDC 2,3 PER B-TRI EDC 1980 8.32* .48 .32 .11 .39 1.04 1981 .06 .12 .08 .01 .56 .02 1982 .07 .85 .66 .02 .39 .24 1983 .01 1984 *** 1985 TLV 5* .04 .06 .51 5 .11 .05 .16 75 .03 N/D N/D 1 .27 .15 .29 50 .02 N/D N/D 50 **.01 .04 10 *TLV lowered to 5 in 1985 **Not monitored for until 1984 ***Not monitored for since 1984 DO 07695? 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