Doug Gray

Principal Project Manager,
Innovative Remedial Technologies Group Manager, AECOM

Mr. Gray has 37 years of project management and engineering experience focusing on the development, design, costing, and optimization of state-of-the-art, innovative remedial alternatives, site assessments, remedial alternative evaluations, remedial investigations, and feasibility studies. Mr. Gray is the Innovative Remedial Technologies Leader for several of AECOM’s key clients and looks to advance innovative technologies geared towards providing more cost effective remedial solutions and value-added services for the client. Mr. Gray provides technical remediation-related support to multiple offices and regions throughout AECOM. Also currently serving as the AECOM Midwest Region Technical Excellence (TE) Lead and as Co-Leader of the AECOM CCR Remediation Technical Practice Group (CCR-Remediation TPG).

Professional History
05/1992 – Present, AECOM Environmental Engineer
03/1984 – 05/1992, Dow Chemical Senior Environmental Engineer

BS, Chemical Engineering, Ohio State University, 1984
Technical Specialty, Reservoir Engineering,
The Ohio State University/NGWA, Credential in GW Science, 1992

Years of Experience
With AECOM: 28
With Other Firms: 9

Professional Affiliations
National Ground Water Association

OSHA HAZWOPER 40-Hour Training
OSHA 30-Hour Construction Safety Training
OSHA 10-Hour Construction Outreach Training
OSHA HAZWOPER 8-Hour Supervisor Training
PA Department of Environmental Protection – 2003 Land Recycling Program (Act 2) Client Workshop
Multiple GW Assessment and Remediation Training Classes

Certified Groundwater Professional
AECOM Project Management Certification Training

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Comparison of Geochemical and Arsenic Speciation Conditions to Evaluate Potential Landfill Impacts to Groundwater

As communicated to the regulatory agency in 2017, the Assessment Plan provided for the characterization of the nature and extent of arsenic concentrations through proposed additional groundwater monitoring in and around the SWLF. Baseline sampling was established and four additional sampling events were completed to provide conclusive evidence that there were no adverse downgradient groundwater impacts from the SWLF leachate. The data from each of these sampling events was evaluated individually and cumulatively over the course of the work. The sampling, analysis and evaluation included observed water levels/groundwater flow direction, arsenic speciation, cation/anions, and field indicator parameters. The sampling included monitoring wells upgradient and downgradient of the SWLF in two underlying permeable units, as well as sampling of SWLF leachate. The geochemical data was evaluated using Stiff and Piper Diagrams, and other graphical methods were used to illustrate the arsenic compositions.

The evaluation conclusively indicated that the SWLF was not contributing to downgradient groundwater impacts. The observed upgradient and downgradient Stiff Diagrams and arsenic speciation patterns were nearly identical, while the plots for the leachate were dramatically different. Piper Diagrams also provided evidence that the leachate was dramatically different from groundwater. These geochemical and arsenic speciation conditions/patterns were observed consistently over the course of the study and provided a robust dataset and lines of evidence to present to the regulators. The regulators ultimately agreed that the SWLF was not impacting groundwater quality and the need for any further corrective action assessment was terminated. This study provides a significant lesson with respect to the fact that sometimes “going old school” is the most innovative approach.