Closure Based In-Situ Chemical Oxidation
Closure Based In-Situ Chemical Oxidation
Oil and Gas Site (Flare Pit)
Location: Wellsite - Crossfield, Alberta
When: 2009 - 2017
Contaminant of Concern: BTEX, C6-C16
Impacted Media and Volume: 80,000 m3 impacted soil and groundwater
Tasks: Detailed site assessment, Hydrogeological characterization, Remedial planning, Detail design, Procurement, Blending and Field applications
The Problem
Former flare pit area overlying shallow fractured bedrock. Condensate (BTEX) contamination dissolved in groundwater covering 21,000 m2.
The Approach
Conduct detailed geological/hydrogeological investigation to identify fracture pathways and contaminate transport.
In-situ chemical oxidation (ISCO) program based on 15 meter injection radius of influence. Establish health and safety protocol and site logistics for handling oxidizer.
Installed 90 injection wells, and injected over 100,000 litres of blended 17% EHP (enhanced hydrogen peroxide) oxidant. Blending is site specific following TRIUM’s ChemOx® process.
The Results
Plume area reduction by >90%
Highly cost effective compared to traditional remedial options, with minimal carbon footprint
Excellent reductions noted with injection distributions exceeding planned performance
Follow-up program for completion of impacts in source area