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`�.�...�-�' '�� °��. - � ,,.�����`'���'" ,,� ��� �-ir•. ter. •�`: � � �'� ,�§"�� ;,,'' -a ' � �' <br /> ��'1., t�� rt..�,F i,.-��.pc�'�:� � r •r _`t"`�r` ��;'� �. - .��� � ...3:a�'. .�.'.''�"���.s ..ssr.r:.rra <br /> E <br /> 42 <br /> GOLDEN GRAIN COMPANY <br /> December 21, 1989 <br /> _... -5045.06 <br /> 202/799 <br /> adore-zone extraction system can be enhanced through the <br /> A process consists of using sparging <br /> __. use of air sparging• This <br /> actively aerate the saturated z5narentren collected in <br /> lize the <br /> wells to The vapor <br /> dissolved Phase hydrocarbons. The advantages and <br /> the vapor extraction as described above. <br /> of soil venting are as follows: <br /> disadvantages <br /> Soil Venting Advantages: <br /> I. system is easily installed and maintained. <br /> 2• <br /> Can be very effective in permeable, sandy formations. <br /> 3. Vapor emissions can be reduced prior to discharge- <br /> 4. Moderate installation cost. <br /> ,.f. Soil denting Disadvantages: <br /> Must be used in conjun <br /> ction with another remediation <br /> system to treat the roundwater• <br /> g <br /> itoring of vapor emissions. <br /> 2. Requires periodic mon <br /> s and crass sections prepared to <br /> An analysis <br /> of the well log very effective in <br /> that vapar extraction will be depth of <br /> _ date indicates and siZ'�y sands, which extend to a <br /> the upper sands layer that exists intermit�ak�lY <br /> clay lay <br /> approximately 22 feet. The de will <br /> at a depth of approximately 22 to 25 feet below gra ediate, but can be addressed throughboth ground <br /> longer to rem <br /> water and vapor extraction. <br /> -- <br /> TECHNOLOGY.I tC. <br />