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' � a --------------- ' ]Excavation Treatments ' U5T Excavation Treatment on a ------------ Farm in Wisconsin INU Approximately 2,000 tons ofpetroleum-contaminated ~hfizitetiz' ti~`4•i;z~` ' w `v}i4+`t„`�jt b , Cta:. w, `„ c „vcC\, z,4Ato- a`i soil was excavated from UST basins on a Wisconsin farm £ •;,~`;4` ;;'x `Mv •~• ,Y ta' 325ou ” ~ }4 p rids of ORC was added to backfill material to :. °v `•~'};h •h4 4 °K`s ` ` '$t {. ~` °� w wh,u , J.✓ vvt,v~h~r,~vY y~,hi[\hC\h4Jr k4 4 ��r�h`tiA��}�4 vt, ,i' i accelerate the aerobic bioremediation of the residual h 'a a ; groundwater contamination Changes in TPHg and BTEX i`t,}` n t x4„ti�; { concentrations following the ORC application are shown ' t7�re 3FoIlowin 212 da s the TPHg declined 68ain ~ r}h, c�h ,':c,`4°~ ~,nv>� from 461 ppb to 147 ppband BTEX levels decreased 82% 3 from 313 ppb to 56 ppb ~i h ,{h`O~OSv4ii�~` ~iyRilV�"^,• ` �`46}hv4,5v �'~,``'` UST Excavation Treatment at a Petroleum Distribution Terminal in Wisconsin � � ` ' • • . � Petroleum-contaminated soils were excavated from a . . „ petroleum distribution ternin-�l 1,650 pounds of ORCS9” Y ousim Y x4 was placed at the bottom of the excavation area before a ow backfilling Monitoring results showed that, after 260 -tam days, TPHd concentrations within the application area51, went from 2,016 to 469 ppb, a decrease of 77a/o j ~ Monitoring of TPHd ended at 260 clays After 462 days, BTEX concentrations went from 38 6 to 72 ppb, a decrease of 81% Figure d shows changes in TPHd and licca;ifayrti� , BTEX concentrations over time Permeable Reactive Barriers ' DRC Permeable Barrier treatment zone indicated that DO was being released into for Plume Control in Canada the groundwater Analysis of BTEX compounds also indi BTEX contamination was controlled effectively in an cited that aerobic biodegradation reactions were occurring ' ORC barrier in Canada A series of eight, 4 inch diameter BTEX-.ontaminated groundwater w-is treated to levels wells were installed at the Front of the plume, each contain- below the drinking water standards for seven months,which is ing 10 feet of ORC socks Groundwater was shallow and consistent withORC's known longevity range Maintaining the flowed in an unconfined stlq, fine-grained sand aquifer at barrier with two socks change-outs per year would cost$7,500 approximately 3 feet per day Prior to the installation of the ORC barrter system, four- teen bundle style piezometers were installed downgradient ' at five discrete depths With reference to the data presented 4 ill Table 1, four months following the installation of the � r�esa t> ORC barrier, measurements of Eh and DO at monitoring Ipoints at the front, within and downgradient of the ORC ""y` "t