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3 <br /> t <br /> �,I <br /> i! As can be seen when comparing the three per day effluent samples <br /> as shown on Table 1 (March 31 thru April 24 , 1992 ) , a slight <br /> € bleed through (channeling) is occurring from the last carbon, even <br /> !I during the first minutes of operation. This channeling occurs as <br /> specific molecules of the contaminate in the vapor stream absorb <br /> and desorb from the carbon surfaces and are not trapped in the <br /> +i1 r micro or macropores of the carbon. This absorbtxon--desorbtion <br /> along with the low concentration of the influent stream ( 12 .12 to <br /> y 1 .56 lbs/day) , which allows the hydrocarbons to remain in <br /> equilllbrium in the vapor stream, does not allow an effective <br /> ij absorbtion (greater than 90% ) to occur . <br /> I <br /> If you have any questions , please call (916 ) 668 -5300. <br /> I' <br /> i Sincerely yours , <br /> i � <br /> I <br /> Roy Butler Jack E. Nap <br /> I Geologist Reg. Geologist #3037 <br /> cc: Ms . Mary Meays , San Joaquin County Health <br /> Ms . Teresa Stuyt, San Joaquin Valley Air Quality <br /> ! <br /> I � <br /> I <br /> r <br /> ,i <br /> I!, <br /> I <br /> I <br /> I� <br /> I <br /> I� <br /> �I <br /> H <br /> I�� [ <br /> I� <br /> 'I R604 vapor, 6/19/92, p. 8 <br /> I' <br /> I <br /> �I <br /> I <br />