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Excavation Treatments UST Excavation Treatment on a Farm in Wisconsin Figure 3: ram Site in Wisconsin Approximately 2,000 tons of petroleum-contaminated soil was excavated from USI'basins on a Wisconsin farm. � �� \ wa 325ounds of ORC was added to backfill material to p sc � accelerate the aerobic bioremediation of the residual ` c�� `i•^S& `'R"��<eti<`. `LD` `tv w �F� x "@T<C�A@af�'f groundwater contamination.Changes in TPHg and BTEXMklo concentrations following the ORC application are shown in Figure 3. Following 212 days the TPHg declined 68a/o � m�, � ' " `- ~'_ from 461 ppb to 147 ppb and BTEX levels decreased 82a/o �, \;`""` � _ AII� ` from 313 ppb to 56 ppb. UST Excavation Treatment at a Petroleum Distribution Terminal in Wisconsin REDUCTION Petroleum-contaminated soils were excavated from a x a f petroleum distribution terminal. 1,650 pounds of ORC K • ` , �ssric�� was placed at the bottom of the excavation area before backfilling. Monitoring results showed that, after 260 days, TPHd concentrations within the application area went from 2,016 to 469 ppb, a decrease of 77%. Monitoring of TPHd ended at 260 days. After 462 days, BTEX concentrations went from 38.6 to 7.2 ppb, a — \ 'x .. �� r ♦ ` � � ztn decrease of 81%. Figure 4 shows changes in TPHd and BTEX concentrations over time. Permeable Reactive Barriers ORC 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 cated that aerobic biodegradation reactions were occurring. ORC barrier in Canada. A series of eight, 4 inch diameter BTEX-contaminated groundwater was 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 consistmtwith ORC's known longevity range.Maintainingthe flowed in an unconfined silty, En -grained sand aquifer at barrierwith two soda change-outs peryearwould cost 57,500. approximately 3 feet per day. _ - 10_ Prior to the installation of the ORC barrier system, four- - oils teen bundle-style piezometers were installed downgradient at five discrete depths.With reference to the data presented ,� in Table 1, four months following the installation of the ^"♦w'h .\ °ss�. ��,. Q�.: ORC barrier, measurements of Eh and DO at monitoring points at the front, within and downgradient of the ORC ��Q o� \�p` lxa , ��"