Dual-well recovery system design for enhanced DNAPL production
- Radian International LLC, Pittsburgh, PA (United States)
- Radian International LLC, Austin, TX (United States); and others
An innovative recovery well system was designed and installed for the enhanced recovery of dense non-aqueous phase liquid, DNAPL (creosote) at an active wood treating facility which had historic releases of wood treating chemicals to soils and groundwater. The regulatory objective of the work, which is being conducted pursuant to a State RCRA Post-Closure Permit, is to implement interim measures for enhanced DNAPL recovery in the vicinity of the downgradient point of compliance (POC) of a 2-acre RCRA Regulated Unit. The RCRA-Regulated Unit consists of two closed former surface impoundments formerly used for wastewater treatment. The facility is underlain by coarsening downward sand and gravel deposits ranging in thickness from about 75 to 90 feet below ground surface (ft-bgs). DNAPL is present in both residual and mobile phases throughout the saturated zone from a depth of approximately 25 to 90 ft-bgs. The DNAPL has also accumulated on the top of a confining clay layer which underlies the alluvial sand and gravel deposits. Due to the physical nature of the subsurface materials and the presence of DNAPL, innovative recovery well installation and design practices were required to provide for the ability to enhance DNAPL recovery. The technology consists of a dual-well recirculating design contained within a singular, large diameter borehole. The design incorporated innovative practices in drilling and installation, screen slot sizing, and well construction, featuring a dual-well design. Conventional mud rotary drilling techniques were utilized with innovative equipment modifications and the use of a natural organic polymer drilling fluid additive to enhance overall recovery well efficiency and performance.
- OSTI ID:
- 569933
- Report Number(s):
- CONF-971116-; TRN: 98:000778-0022
- Resource Relation:
- Conference: 1997 petroleum hydrocarbons and organic chemicals in ground water: prevention, detection, and remediation conference, Houston, TX (United States), 12-14 Nov 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the 1997 petroleum hydrocarbons & organic chemicals in ground water: Prevention, detection, and remediation; PB: 811 p.
- Country of Publication:
- United States
- Language:
- English
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