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On July 24 , VSB3 , VSB9 and VSBll were added to the system. As of <br /> July 27 , 1992 the wells were producing at the fallowing initial <br /> rates : VSB3, 0 . 37 lbs ./day; VSB9 ; 6 .74 lbs/day and VSB11 , 2 . 37 <br /> lbs/day. <br /> I <br /> Monitor well , MW 3 has not been used for vapor extraction during <br /> the operations under the Authority to Construct. <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 /> "r specific molecules of the contaminate In the vapor stream absorb <br /> and desorb from the carbon surfaces and are not trapped in the <br /> macro 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 /> equillabrium an the vapor stream, does not allow an effective <br /> absorbtion (greater than 90%) to occur. <br /> I <br /> f <br /> If you have any questions , please call (916 ) 668-5300 . <br /> Sincerely yours , G`SNDG pc' <br /> JACK E `rJ` <br /> NAPPER <br /> Na 3037 <br /> Roy Butler Jack E. Napper aq <br /> Geologist Ca. Reg. Geologist #3037 OFCA� <br /> L <br /> cc: Ms . Mary Meays, San Joaquin County Health <br /> Ms . Teresa Stuyt, San Joaquin Valley Air Quality <br /> i <br /> i <br /> • R604 vapor , 7/31/92 , p. 9 <br />