single-well push-pull test

Knowledge graph centered on single-well push-pull test with 10 nodes and 18 connections. Top connected: TOC analysis, Reactive transport modeling, Grand Junction, Single-Well Push–Pull Tracer Test Analyses to Dete, Aaron D. Tigar.

Method synopsis

A controlled injection and extraction test using conservative tracers to evaluate aquifer transport and reactive processes. Involves sequential injection of traced and untraced water, followed by a drift period under natural gradient conditions, then pumping to recover injected water.

Synthesized from method descriptions across 1 paper using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Single-Well Push–Pull Tracer Test Analyses to Determine Aquifer Reactive Transport Parameters at a Former Uranium Mill Site (Grand Junction, Colorado) (2023), Minerals. Implementations in other papers (listed below) may differ.

1. Install tracer testing wells
   Wells were installed using a direct-push drilling rig with cores collected at selected locations. Wells were completed inside hollow drill stems with disposable drive points, prepacked filters, and formation collapse around the filter up to the water table. Final annulus completion included additional silica sand followed by bentonite seal and cement at surface.
   Quantities: Four wells (0106, 0110, 0120, 0121) with screens at depths 4.0-5.5 m bgs (110-series), 3.5-5.0 m bgs (100-series), and 2.9-4.4 m bgs (wells 0120 and 0121)Duration: Installation completed in two phases with wells 0100-0105 and 0110-0115 first, then 0106-0108 and 0116-0118Conditions: Wells partially penetrating alluvial aquifer with depths to bedrock 6.6, 6.2, and 6.3 m bgs respectively
   Equipment: direct-push drilling rig, prepacked filter, disposable drive point, silica sand, bentonite seal, cement
2. Prepare injection solutions
   Gunnison River water was collected and amended with sodium iodide and sodium 2,3,4,5,6 pentafluoro benzoate (PFB) as conservative tracers. Solutions were prepared to provide injection water concentrations of nearly 35 mg/L for both tracers.
   Quantities: Traced injection volumes: 1100 L (wells 0106, 0110), 110 L (well 0120), 1100 L (well 0121)Duration: Prepared immediately before injectionConditions: River water used as base with tracer additions
   Equipment: sodium iodide, sodium 2,3,4,5,6 pentafluoro benzoate (PFB)
3. Conduct push-chase-drift-pull testing
   Injection of traced river water (push phase) at rates 19.9 L/min (0106), 21.0 L/min (0110), 18.9 L/min (0120), 17.2 L/min (0121), followed by untraced river water injection (chase phase), drift period under natural gradient conditions, then pumping to extract injected water.

Typical Equipment

• direct-push drilling rig
• high-volume peristaltic pumps
• autosampler

Output Measurements

• hydraulic conductivity
• dispersivity
• sorption parameters
• reaction rates

Papers Using This Protocol (1)

Places Where Used