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AUG-13--1993 OB:3-- FRChI PUBL I C HEALTH SERO 1 CES T17 94r x101.39 P.0^ FF'01^, CA I N T EG}?q t tJASTE MCAT 9127346 33>�e3 P. { T..FA Advisory #46 November 6, 1997 Page 5 of S coilected during the fire did not $bow elevated PCDD or PCDF concentrations. However_ tow :onceiTtratio3ts of both carnpoun6s were detected in vegetatior.coilected at 100 meters and 240 nieters fi•vm the site. PCDD and FCDE concentrations I the fofi _t doCreased with time but was still detestable for at least 240 days after the fire started.'YjX Potential Health Hazards To evaluate worker protection at tire tires,two cases must 6e id red poter3t' eX SUM while the fire is aurning and potential exposure after the fire is out. This evaluation considers what activities will be performed at the site and what substances are present A decision as to whet1w a health hazard ex;-sts is based an comparing emissions estimates with eststbiishod saf4 ieveis for those c�omposcz,ds. Based upon avaiiable information,the following chemical hazards are of occupational wncern. While the fire is still burning,the smoke plume may corrtain li=rdous substances that should not be ;nhaled or allowed to contact the skin. The two substaxWes fbr which excessive exposure risk exists ac believed to be polycyclic aromatic hydmcarbons and carbon monoxide.xx Poly-yoc clic aromatic hydrarbons(FAH)are a class of==pounds consisting of various arranger CUS and substitutions of multipie benzene rings. PAHs result mainly from the incamplae cautbustiun or high-temperature treatment of coal-derived materials. Since thers are av pubiisbcd impvsurc limits tv PAHs, coal tar pitch volatile exposure valass are used. The coal tar pitch volatile(CT7V)is a"benzene- solubie" fraction of total particulates that generally contains substances that have carcinogenic potential. Epideiniciogical studies of the cancer mortality rntes among those workers that have high PAA exposure show an association with increased mortality froth lung cancer. Benzene compounds may be produced as part of the thermal brCMJWOWU and refortnacion of molecules in the cool ing process. Benzene may cause adverse health effects tttrvugh itibalatiott,ingestion,or dermal contact. Acute exposure svmptoms include dizziness,euphoria.aitidiness,imdache, nausea.weakness, drowsiness,respiratory irritation,pulmonary edema,and pneturtonia. Bene can also cause irritation to the skin,eves,and mucous mernbrarm. Allowable Employee Exposure Levels Coal Tar Pitch 0.2 rnglm3 o.I mg/tn3 "` _ 4.2 mg/m3 ,-A1 - cyelohexarre actrsrtabis A1-cot�rmed htutiaa-c�v>� $enze,>ae I ppm gppm -01-rpm - -1 ppt°- 10 ppm,A2 A.2-wWectW human carcntagert Carbon Monac fie 25 ppm C200 ppm 35 ppm C200 ppm 50 Fpm 400 ppm Toluc e