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On July 24 , VSB3 , VSB9 and VSB11 were added to the system. As of <br /> July 27 , 1992 the wells were producing at the following initial <br /> rates : VSB3 , 0 . 37 lbs ./day; VSB9; 6.74 lbs/day and VSB11 , 2 . 37 <br /> lbs/day. <br /> Monitor well , MW 3 has not been used for vapor extraction during <br /> the operations under the Authority to Construct. <br /> i <br /> 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 /> 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 /> micro or macropores of the carbon. This absorbtion-desorbtion <br /> along with the low concentration of the influent stream ( 12 . 12 to <br /> 1 .56 lbs/day ) , which allows the hydrocarbons to remain in <br /> equillibrium in the vapor stream, does not allow an effective <br /> absorbtion (greater than 90% ) to occur . <br /> If you have any questions , please call (916 ) 668 -5300 . <br /> EDGE <br /> Sincerely yours , J CK E <br /> Q7 <br /> Roy' Butler Jack per <br /> Geologist Ca . Reg. Geologist *3 37 <br /> cc: Ms . Mary Meays , San Joaquin County Health <br /> Ms . Teresa Stuyt , San Joaquin Valley Air Quality <br /> R604 vapor , 7/31/92 , p. 9 <br />