2022 Annual GWPC & UIC Conference

June 21, 2022

Join SCS Engineers at the 2022 Annual GWPC & UIC Conference where we focus on groundwater protection and underground injection control (UIC). The conference features live sessions, interactive round tables,  discussion groups, and networking opportunities with both in-person and virtual attendance options. Look for these experts’ sessions, including:


Thursday, June 23 at 8:30-10:00 Class VI UIC
Sensitivity of Aquifer Chemistry to Changes in Carbon Dioxide Partial Pressure: Implications for Design of Groundwater Monitoring Protocols,” with Kacey Garber. Using a case study, Kacey takes us through the great care taken in the design, operation, and permitting of injection of carbon compounds to ensure that the sequestration is effective and permanent. She takes us through the implementation of an optimal and cost-effective groundwater protection plan by establishing a groundwater monitoring protocol that is specific to the site, sensitive to changes in the partial pressure of protection, and relative insensitive to natural variability and hydrochemical facies changes.


Stephanie HillThursday, June 23 at 10:30 – 12:00 Class I UIC
Microbially Influenced Corrosion in Injection Wells: A Case Study in a Class I Well for Coal Combustion Residuals,” with Stephanie Hill. Stephanie takes us through a case study of MIC-related failure used for leachate disposal from a CCR facility. She will walk through the investigation process which included annular pressure testing, downhole caliper logging, casing thickness detection, injection fluid analysis, and metallurgical analysis to identify the cause of failure. Stephanie will cover the corrections made using a customized plan to prevent future MIC-related issues.


Take me to the agenda and registration for the GWPC and UIC Conference.







Posted by Diane Samuels at 12:00 am

Geochemical Evaluation for Scale Reduction of Coal Combustion Residuals Leachate in Class I UIC

January 14, 2019

Downhole scaling of organic compounds presents challenges in Class I disposal wells. Once chemical and physical conditions drive biological growth and mineral precipitation, the resulting downhole scale must be confronted with expensive workovers, stimulations, or even plugging and abandonment. In one Midwest case study, an electric utility is battling ferric, carbonate, and sulfate precipitate driven by fluctuating pH in its coal combustion residuals (CCR) leachate. Using a variety of geochemical models, we are taking a proactive approach to eliminate expensive fixes by simulating the saturation indices of key mineral species under defined parameters that drive the formation of downhole precipitate under temperature and pressure.

Using a variety of chemical equilibrium models such as PHREEQC, MINTEQ, WATEQ4F, and Geochemist’s Workbench, conceptual scenarios are run at the surface and in the mixing zone of the downhole reservoir using site-specific water-quality data, pressures, and temperatures. Each scenario provides anticipated mineral saturation states, used to estimate mass removal or chemical neutralization to prevent downhole precipitation. To mirror the dynamic nature of the CCR leachate water chemistry, modeling will continue as an iterative process whereby we will continue to collect data and run simulations to stay ahead of changes that could affect the downhole well chemistry.

This proactive approach will reduce the potential for downhole scaling to increase operational efficiency, reduce maintenance costs, and extend the life of this Class I well.

Meet Stephanie Hill and the SCS team at the Groundwater Protection Council’s 2019 Underground Injection Control conference. Tuesday, Feb. 26 from 10:30 a.m. – 12:00.


Stephanie Hill obtained a Bachelor of Science degree from the University of Texas at Austin in geological sciences with a focus on hydrogeology. She serves clients nationwide with the SCS Engineers team as a senior project manager and oversees the St. Louis area operations. Stephanie’s project experience includes hydrogeological evaluations, liquids management solutions, and Class I injection well permitting, design and operation.








Posted by Diane Samuels at 6:00 am