394852 - Monitoring Design for Groundwater Remediation Using Engineered Injection and Extraction
Wednesday, June 6
10:30 AM - 12:00 PM
Location: Lakeshore B
Samuel Waers, University of Colorado Boulder – Dept. of Civil, Environmental, and Architectural Engineering; Joseph Kasprzyk, University of Colorado Boulder – Dept. of Civil, Environmental, and Architectural Engineering; David Mays, University of Colorado Denver – Department of Civil Engineering
Engineered injection and extraction (EIE) is a method of in situ groundwater remediation that uses a sequence of injections and extractions to promote spreading of an injected treatment amendment into a contaminant plume, creating more contact between the amendment plume and the contaminant plume, leading to enhanced contaminant degradation. In EIE, wells are placed around the contaminant and amendment plumes. Clean water is injected into and extracted from the wells in a pre-defined sequence to create an unsteady flow field that creates plume folding and spreading. The proof-of-concept of this method has been demonstrated through numerical simulations, in which the location and geometry of the contaminant, amendment and reaction product plumes can be determined throughout the EIE process, and therefore the amount of contaminant degradation can be readily quantified. In field applications of EIE, the amount of degradation must be quantified using sparse data collected from a network of monitoring wells. Although a dense monitoring network with a high number of wells would provide sufficient data to quantify contaminant degradation, the high cost of a dense network may be prohibitive. Thus we seek to optimize the number and placement of monitoring wells to obtain sufficient information to quantify contaminant degradation while minimizing cost. We use multi-objective evolutionary algorithm optimization, coupled with groundwater flow and transport simulations, to identify optimal monitoring network designs.