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-S'1':N':' <br /> 4 . <br /> Inter-office Memorandum <br /> TO. Regional/Divisional Safety officera cc: QA/H 6 S staff <br /> FROM. George M. Crawford v DATE: 2 August 1908 <br /> PROJECT: 1x'p..NO.: <br /> SZIBJECT: Benzene Action LeVel Guideline <br /> ACTION: <br /> .As many of you are aware rulings by OSHA have resulted in a <br /> decrease in the Permissible Exposure Level (PED) for Benzene to <br /> 1.0 ppin. This ruling has resulted in a need to establi3h action <br /> level for job sites/activities where benzene :say be listed as a <br /> constituent o: the contamination suspected. These activities <br /> would incluCe bp_t not necessarily %>e limited to gasoline spill <br /> response, tank excavations, and drilling activities where <br /> gasoline or petroleum constituents are encountered. <br /> BENZENE ACTIO?l LEVEL GUIDEL114E <br /> 1) Monitor x_ujt,iLr Tto� contaminant concentrations with <br /> Direct Reading Instruments sensitive to aromatic compounds <br /> (eg. CVA, HM) . <br /> 2) It readings reach 1 to 5 units abovo background then Level <br /> c protection will be required. <br /> 3) When 5 units above background are reached with <br /> direct-reading instrumentation than levels must be <br /> monitored with colorimetric tube indicators sensitive to <br /> 0.5 ppm Benzene. <br /> 4) If colorimetric tube readings indicate less than 1.0 ppm <br /> then Level C operations can continue. Periodic <br /> surveillance with the colorimetric indicators should <br /> continuer <br /> i 5) If colorimetric tube readings indicate 1.0 ppm benzene or <br /> greater for two (2) successive readings taken 10 minutes <br /> apart then Level B protection must be effected. <br /> Nota: Irrespective of colorimetric tube indications Level B <br /> protection will be initiated should direct reading instrument <br /> corce-titrations reach 500 units above background during gasoline <br /> clean ups on tank excavations. -� <br />