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5 <br /> Ur <br /> = r +i, <br /> !i'Section No 6 <br /> 3' <br /> 1 <br /> 1 <br /> , Revis ion'No 10 <br /> Date September 5, 1991 <br /> Page 7 ,of 55 <br /> ` � , f. , Lf e,y 1, �w..p , ,a . F , i ,�i V q � i L r •• r , <br /> ■ i i Confined Space or' Personnel Air,Samples may pbe collected for purpose <br /> __9fmonitoring,specificrexposure�of personnel Sampling_stations <br /> will be located relative to potential, emission sources, air flow <br /> patterns, and personnel` as, in <br /> 'de'scribed , {r the sampling and analysis <br /> plan 11 ' <br /> ■ Subsurface 'Air -Samplesl may,�'be collected from either temporary or <br /> permanent subsurface monitor's as specified in the ' sampling and <br /> analysis plan <br /> .,Depending on the' `requirements specified in ;the sampling and analysis <br /> plan,' gas ' samples may be collected by either active or passive means <br /> Collection_o£_air_sam les b an active means-,depends on_inducin pressure <br /> r P , Y - g a P ' - <br /> gradient' between the sample source_rand ,the sample repository This pressure <br /> gradient will be induced positively by means' of a pump or negatively by <br /> cryogenic/evacuation techniques' Active air sampling will be performed at a <br /> single point in time (grab) by- releasing the pressure gradient, or over an <br /> ..L... <br /> —j— It. ... _ .. _:s. ,. » w..,S ._ V,'._ _ T.. 7 .., a _..., r `�. " pis -• .. .— . _».. <br /> extended—period_of _time�(i a _,—integrated)—by maintaining—the—pressure�_.� . <br /> gradient for the specified period of time (i a 24 hours) <br /> Collection of air , samples -by passive means depends upon ambient <br /> pressures, primarily diffusion and dispersion' Passive air sampling methods <br /> i IF , <br /> will be used to monitor, personnel exposure by measuring time- averaged <br /> iconcentrations Gases present in the surrounding environment will be <br /> collected by,an adsorbent material at rates and quantities dependent upon the <br /> process of,,diffusion , <br /> ' EBoth of these methods employ specific sampling equi ment ',re uirin <br /> g ' <br /> _ <br /> specific handling procedures which are described separately in the following <br /> sections ' <br /> , <br /> 6-7 <br />