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OFE � <br /> n t �� G <br /> ggoi <br /> ffA� Cleanu Decision <br /> * y p <br /> a <br /> � a Fact Sheet <br /> Ar <br /> Rr <br /> Solvent Extraction � �� MSAM, � 11 <br /> ' k M <br /> .� Solvent extraction removes DDT from soil by uttmj t�sn tre t meat vessel and.pouring a patented <br /> 1 f , I <br /> II solvent mixture over the soil: The solvencausegh�lr'il >eeleased from the soil and carried away with <br /> f the solvent. The solvent then passes throuW*-,M6' asys t rat removes the DDT,and the clean solvent <br /> can then be recirculated through the treatment YET is repeated until the cleanup goal is met. <br /> o � I <br /> The filter containing the concentrated D�tncmetedand� eclean solvent is reused at another site. After <br /> enough DDT is removed from the soil Iefrove> sol etrt the sot".s removed by heating the soil in the treatment <br /> vessel and collecting the solvent,which iso onzed thehc soil, Micro-organisms(usually bacteria can 9 g Y ) <br /> also be put into the 1 <br /> p sol that essentially eat£artiy,.. rttg scent"This use of micro-organisms is called <br /> Ij k g <br /> bioremediation,and it is an imitation of a proc ,stltat ocAture. Solvent extraction is a closed-loop <br /> �� Il i <br /> system,which means no wastes are releasedta� �sun soil,or water. <br /> ', <br /> . He, <br /> The solvent extraction treatment system canoe butt zt�tICSeStoctcton. The cleanup goal for treated soil is 3 <br /> milligrams per kilogram. This cleanup goA,J§.zbased the treated soil in a designated area located in <br /> an industrial area on NCS Stockton. Solye��o4 le <br /> � ly treat soil to the 3 milligram per kilogram <br /> % <br /> i <br /> cleanup goal for the designated area,whit P tri rezo l ar health and the environment...1his designated _ <br /> A+'.. <br /> area would be regulated as a corrective aan m �gemennand land use for the area would be limited by <br /> � � I] <br /> k deed restrictions. The treated sail goes toth �+eaciacmnatiagement unit because while the 3 milligram <br /> � - <br /> per kilogram DDT cleanup goal is protectiV ee o,hu tart€ It a the�environment,federal land disposal <br /> �1 It � ��N� : <br /> regulations require a 0.0$7 milligram per ktii►gr �Qe�srthe��soil to be placed in an area with ane- <br /> s> 4, li ! <br /> stricted land use. Treatment technologies oertrmecorthe-'technology on which the 0.087 milligram <br /> Per kilogram DDT level is based),cannot Telt*all sg ly zieach the0.087 milligram per kilogram <br /> DDT.level: <br /> i �. , y ip <br /> ' Use of solvent extraction would require treating thecltp`ledfsCI from Sites 4 SG,and 5H and possibly <br /> r W, 1 P Y <br /> excavating the soil from IAS-9 if the resuf�of the e" og�iealassessment indicate that capping and paving <br /> IAS-9 is not protective. The estimated costofztieatin .excavatetfsoil trom all four sites is$4,323,973. Treat- <br /> ing soil from all faun sites using solvent ex#raci�€tiwo�dtte4gproximately 1°years. if only the stockpiled <br /> soil from Sites 4, 5G,and 5H is treated, the estimated cyst ia� 9.. 600_ Treating soil from Sites 4,5G,and 5H <br /> using solvent extraction would take approximately�4 amont q <br /> t <br /> SoIvent extraction is the recommended method for treatuig the stctckpi'led soil from Site 4,SG,and SH. <br /> I rFm r� I <br /> *Words in bold are defined in the''glossary <br /> 9 <br />