Matrix Diffusion Modeling Applied to Long-Term Pump-and-Treat Data: 1. Method Development

TRRP Training: 2022 Program

presented by: GSI Environmetal Inc.

Texas Risk Reduction Program regulations (TRRP; 30 TAC 350) establish consistent risk-based protocols for assessment and response to soil, groundwater, or surface water impacts associated with environmental releases of regulated wastes or substances.

Presented by GSI Environmental Inc., this popular and informative training series is a must for professionals who need a working understanding of TRRP and those needing to stay up-to-date with the latest TCEQ TRRP guidance and policies.

TRRP Training Course (2 Days): Provides an overview of the TRRP framework and step-by-step training on property assessment and response action procedures established under the TRRP rule

Attendees will become acquainted with rules, key guidance and policies covering affected property assessments, protective concentration levels, and response actions. The course material presents strategies for efficient project management in compliance with TRRP and explains the various report forms adopted by TCEQ.

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Dates and Location

Dates

June 14th and 15th, 2022

Location

Crowne Plaza River Oaks 2712 SW Freeway Houston, Texas 77098 713.523.8448 http://www.crowneplaza.com/

Price and Registration

Early-Bird Price

(Paid by May 1, 2022)
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Authors: James M. McDade, Poonam R. Kulkarni, Mir Ahmad Seyedabbasi, Charles J. Newell, Deepa Gandhi, John D. Gallinatti, Virgilio Cocianni, Du’Bois J. Ferguson

Published: March 2013 in Remediation Journal volume 23 (2) pages 71-91.

Abstract
Despite the installation in the 1980s and 1990s of hydraulic containment systems around known source zones (four slurry walls and ten pump-and-treat systems), trichloroethene (TCE) plumes persist in the three uppermost groundwater-bearing units at the Middlefield-Ellis-Whisman (MEW) Superfund Study Area in Mountain View, California. In analyzing TCE data from 15 recovery wells, the observed TCE mass discharge decreased less than an order of magnitude over a 10-year period despite the removal of an average of 11 pore volumes of affected groundwater. Two groundwater models were applied to long-term groundwater pump-and-treat data from 15 recovery wells to determine if matrix diffusion could explain the long-term persistence of a TCE plume. The first model assumed that TCE concentrations in the plume are controlled only by advection, dispersion, and retardation (ADR model). The second model used a one-dimensional diffusion equation in contact with two low-permeability zones (i.e., upper and lower aquitard) to estimate the potential effects of matrix diffusion of TCE into and out of low-permeability media in the plume. In all 15 wells, the matrix diffusion model fit the data much better than the ADR model (normalized root mean square error of 0.17 vs. 0.29; r2 of 0.99 vs. 0.19), indicating that matrix diffusion is a likely contributing factor to the persistence of the TCE plume in the non-source-capture zones of the MEW Study Area’s groundwater-extraction wells.