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rations to lob placement, include a history of chronic shin should be taken during one workshift, and the highest of all disease.conawrent derniasatis,or meld nem-Nowlyuc anemia measurements taken is an estimate of the worker s exposure (e.g , mild iron-deficiency anemia) if the pends of maximum exposure are not clearly defined, • Periodic medicei screening and/or biologic monitonng a stausucal procedure which can be used as a peak exposure Occupational health interviews and physical examinations detection strategy is gives tit the Occupational Dposum Sam- should be performed at regular lnwrvals Additional Mamma- phng Stmegy Manual. tions may be necessary should a worker report symptoms that 0 Method may be aunbuted to exposure to benzene The umtervwas,ex Sampling and analysis may be perfvrrmed by collecting ben- animations.and appropriate medical screetung and/or biologic zene vapors with charcoal tubes foilowed by desorption with rtmonmtormng tests should be directed at identifying an excessive carbon disulfide and analysis by gas chromatography Direct- decrease or adverse vend in the wm%i ry and physiologic func- reading devices calibrated to measure berizene may also be used von of the skin, liver. and respiratory. nervous, and hema- if available.A detailed sampling and analytical method for bem- topownc (blood-cell-forming) systems as compared to the zone may be found in the NIOSHManual gfAnal}weal Medhnds baseline status of the individual worker or to expected values (method number 1500) for a suitable n*rence population.The follow mg tests should be used and interpreted according to standardized procedures PERSONAL PROTECTIVE EQUIPMENT and evaluation criteria recom mmied by MOSH and the ATS: stanidardized questionnaires and tests of lung funetian. Chemical protective clothing(CPC)should be selected after • Medical pracdcas nmow mended at no dine of job trans- uWaAng available performance data, consulting with the fer or termination. firer.and then evaluating the clotting under actual use The medical.environmental.and occupational history Timer- conditions. views,the physical etiarnmation,and selected physiologic aid Vfttas should be provided with and required to use CPC, laboratory tests which were midtnclW at rhe imam of pplaaern ent glmes,and atter appropnatc protective clothing ne ssary to should be repeated at the nine of job transfer or lamination. pmt skin contact with benzene. ' Any changes in the worker's health status should be compared to those expected for a suitable reiesaiae population.Because SANITATION occuupwonal exposure ui benzene may pause dtaeases of prolonged induction-latency.the need for nmedhcal s>ISW4<larmce Clothing winch is coniarnmated with benzene should be re- nW extend well beyond termination of employment. moved inmiediately and placed tm sealed containers for storage ' . Sendnel haft!Irint: uurtil it can be discarded or uum d pm+nsum is made for the I Acute SHE's include.Aciue myeloid leukemia and contact renwvai of benzene from the clothing if the clothing is to be and/or allergic derrmamm laundered or cleaned. the persona perfiornimg the operation 2 Delayedonset SHWs tacludew Decrrsse m the nmzber(neu- should be unformed of benzene's hazardous properties.Rmn- tropenia)or absence(agramilotyt w)of certain whim blood able clothing and ap q mems should be checked for residual cells in the peripheral circulation and/or in die bone marrow rotttattuma uan bdare rouse or storage. (aplasuc anemia)and can=of the red blood cells(esythro• A change roost with showers,washmg facilities,and lockers leukemia) that permit separation of street and work clodmes should be MONITORING AND MEASUREMENT pnwided PROCEDURES Workm should be required to showier toEowwg a wcauft ' and prior to pumng on timet clothes.Clean work elothcs diouid . 7WA exposure eroitmtios be provided daily Measurements to determune worker exposure to benzene Skin that becomes contaminated with benzene should be should be taken so that the TWA exposure n based on a smngie promptly vasvasbed with soap and water. ' entire workshift sample or m appivprm m urbu of comecu- tive samples collected during the cone omit Witt Under cer- Abrkers who handle berszeme should wash their fasces.hands, tarn conditions. it may be appropriate to collect several and(arcaims thotnughly with soap and water bdore eatnrig, short-term imwrval samples(up to 30 mumu ms out)to deter- smokmg,or usmg toilet bcdities mine the ova mp expo sum level.Air samples adionld be taken The storage.moa diapeesmg,or comsumptigm of food in the worker's breathn zone(au that maze Wady repmsemts or beveraps. the storage or application of cosnmeaca. the ' that inhaled by the worloer). storage or use of smoiang mmamuls,or that suaw or use of * Cek3iag eatisxntratiasi eseimaetion products for dme*v%should be prohibited in work areas. Measurements to determine worker exposure should be taiaen duringlicruxis' of�expected tions COMMON OPERATIONS AND CONTROLS of benzene.Fadi meas,mtmem to dMrmnme time MOSH REL (ceiling etposim)in the worker's bread nig zow(airdw moot Cararaon operations to which exposure to benzene may occas nearly repments that whaled by the worker)should consist and control amWwds which zany be dbmve in each case are ' of a 15-minute saimple. A Minimum of duce meas umnem fated inti Md)k 2. /SSS eettnno 3