Field evaluation of a horizontal well recirculation system for groundwater treatment: Field demonstration at X-701B Portsmouth Gaseous Diffusion Plant, Piketon, Ohio

Korte, Nic; Muck, M.; Kearl, P.M.; Siegrist, R.L.; Schlosser, R.M.; Zutman, J.L.; Houk, T.C.

doi:10.2172/296857

Cited by 5 publications

(8 citation statements)

References 12 publications

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“…The hydraulic conductivity of the Gallia was measured at 20 Wday (7 x c d s ) by a pumping test at the upgradient (west) horizontal well (Korte et al, 1997). This is comparable to values measured at other wells within PORTS that are screened within the Gallia aquifer (H. Sydnor, Lockheed Martin Energy Systems, personal communication).…”

Section: Lithology and Hydrogeologysupporting

confidence: 62%

“…This is comparable to values measured at other wells within PORTS that are screened within the Gallia aquifer (H. Sydnor, Lockheed Martin Energy Systems, personal communication). However, the hydraulic conductivity measured by single-well pump tests in monitoring wells located between the X-701B horizontal wells ranged from 24 to 411 ft/day (Korte et al, 1997), indicating that lateral heterogeneities exist even within the 90 ft x 200 ft region between the horizontal wells. Preferential flow was observed during a tracer test conducted as part of the ISTR demo (Korte et al, 1997).…”

Section: Lithology and Hydrogeologymentioning

confidence: 98%

“…However, the hydraulic conductivity measured by single-well pump tests in monitoring wells located between the X-701B horizontal wells ranged from 24 to 411 ft/day (Korte et al, 1997), indicating that lateral heterogeneities exist even within the 90 ft x 200 ft region between the horizontal wells. Preferential flow was observed during a tracer test conducted as part of the ISTR demo (Korte et al, 1997). A similar pattern in permanganate transport between the horizontal wells was noted during the ISCOR demo (see Sect.…”

Section: Lithology and Hydrogeologymentioning

confidence: 98%

“…The relative stability of -04 makes it more attractive and effective for applications where oxidizing power must be maintained over longer time periods, such as when the oxidant needs to be flowed over long distances to treat large volumes of subsurface media. The ISCOR field demonstration took advantage of existing infrastructure and extensive site characterization data generated by previous field demonstrations at X-701B (Korte et al, 1997). The ISCOR field test was implemented using a pair of previously installed horizontal wells ( Fig. l.l), with innovative filter materials (500 m) instead of conventional well screens, that transect an area of DNAPL contamination within the underlying Gallia water-bearing unit.…”

Section: List Of Figuresmentioning

confidence: 99%

“…The ISCOR field test was implemented using a pair of previously installed horizontal wells ( Fig. l.l), with innovative filter materials (500 m) instead of conventional well screens, that transect an area of DNAPL contamination within the underlying Gallia water-bearing unit. These wells were installed as part of the In Situ Treatment through Recirculation (ISTR) field demonstration conducted in 1996 ( Korte et al, 1997). In the ISTR field demo, groundwater was extracted from the west horizontal well, run through an iron filings-based treatment system that reductively dechlorinated TCE, and re-injected into the east horizontal well.…”

Section: List Of Figuresmentioning

confidence: 99%

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A full-scale demonstration of in situ chemical oxidation through recirculation at the X-701B site

West¹,

Cline²,

Holden³

et al. 1997

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This report has been reproduced directly from the best availattie copy.Available to DOE and DOE contractors . . ( H 2 0 2 ) , if applied at sufficient loadings to contaminated soils, can effectively oxidize trichloroethylene (TCE) and perchloroethylene (PGE). Between the two oxidants, KMn04 is more stable and may result in a higher rate of TCE degradation. LIST OF TABLESIn 1996, researchers at Oak Ridge National Laboratory ( O N ) proposed an oxidant delivery technique involving injection and recirculation of the oxidant solution into a contaminated aquifer through multiple horizontal and vertical wells. This technique would be applicable to saturated, hydraulically conductive formations. In the spring of 1997, the Department of Energy (DOE) at the Portsmouth Gaseous Diffusion Plant (PORTS) agreed to collaborate with the DOES Subsurface Contaminants Focus Area to conduct a field-scale treatability study using in situ chemical oxidation through recirculation (ISCOR). PORTS agreed to support the demonstration at the X-701B site where the technology can potentially be used to remediate TCE-contaminated groundwater and sediments. The ISCOR field demonstration took advantage of existing infrastructure and extensive site characterization data generated from previous field demonstrations at X-701B. The field test was implemented using a pair of previously installed horizontal wells that transect an area of DNAPL contamination. Groundwater was extracted from one horizontal well, pumped to an existing pump and treat facility, dosed with KMnO4, and re-injected into a parallel horizontal well approximately 90 ft away. The field demonstration lasted approximately one month. Treatment effectiveness was determined by comparing contaminant levels in pre-treatment, during, and post-treatment groundwater samples and preand post-treatment soil samples Analytical results from the field demonstration indicate that ISCOR is effective at oxidizing TCE in the saturated zone. Lateral and vertical heterogeneities within the Gallia impacted the ability to deliver oxidant solution uniformly throughout the area between the horizontal wells. Furthermore, TCE in the neighboring low-permeability formations (the Sunbury and Minford layers) was not affected by oxidant recirculation through the G a l l i a . The oxidant may not have had time to diffuse from the Gallia into the Sunbury or Minford formations given the short duration of this test. However, in general, TCE was not detected where oxidant was present in samples collected from Gallia monitoring wells within the test region. Reduction of the TCE mass within the more conductive Gallia formation will lead to an overall reduction of TCE mobility within the X-701B area. Long-term groundwater monitoring will be required to fully assess the impact of this demonstration on the ISCOR test region.. vi ACKNOWLEDGMENTSThe planning and execution of the full-scale demonstration required the efforts of many individuals. The contributions of the following are recognized and appreciated.

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Section: Lithology and Hydrogeologysupporting

confidence: 62%

Section: Lithology and Hydrogeologymentioning

confidence: 98%