Remediation Technology Summit


Jeff McDonough
Jeffrey McDonough. M.S., P.E.

Principal Environmental Engineer
Arcadis

Jeffrey McDonough, M.S., P.E. graduated from Penn State University in 2005 and 2006 with a Bachelor’s of Science in Civil and Environmental Engineering and a Master’s of Science in Environmental Engineering, respectively. Jeff’s master’s research quantified and characterized the immobilization of uranium to understand and mitigate subsequent dissolution. Jeff began working for Arcadis in 2007 in Newtown, PA, and continued working for Arcadis in San Francisco, CA (2011-2016), and now in Portland, ME. As a Principal Environmental Engineer, Jeff specializes in remediation of a wide variety of compounds over a global footprint. In 2016, Jeff co-authored Remediation Engineering: Design Concepts, and in 2017 was named a Mid-Atlantic Region Top Young Professional. Currently, Jeff’s focus for Arcadis is on poly- and perfluoroalkyl substances as the North America co-leader within Arcadis’s Technical Knowledge & Innovation pillar. Outside of work, Jeff is happily married, a proud father, an avid football fan, and a stand-up comedy enthusiast.


SESSION CHAIR
Innovative and Optimized Delivery Methods


FLASH POSTER
Precipitating Success; A Solution to Heavy Metals in Groundwater

Heavy metals in groundwater require a reliable and predictable in-situ groundwater remediation approach to achieve regulatory objectives. Heavy metals cannot be destroyed or volatilized, and the primary treatment mechanism for groundwater is the formation of low-solubility metal precipitates. Metal sulfides present an attractive form of precipitation because they are predicted to be up to four orders of magnitude less soluble than other metal precipitates. A former galvanizing facility will be discussed that represents surficial groundwater from Tampa, Florida impacted with 10s to 100s of milligrams per liter (mg/L) nickel and 1,000s of mg/L zinc (with a variety of other heavy metals slightly exceeding relevant regulatory criteria) at pH 3.0 to 5.0. Two rounds of bench-scale treatability testing were conducted to evaluate heavy metal removal from the groundwater using sodium polysulfide, and the results were used to design a field-scale remedy inclusive of more than 800 direct-push injection points within two distinct hydrostratigraphic units. A total injection volume of approximately 1.87 million gallons, including approximately 65,000 gallons of concentrated sodium polysulfide and approximately 4,500 gallons of concentration sodium hydroxide, was completed over an approximate one-year period. Performance Standards for many of the monitoring wells at the site were achieved after the single injection, with recalcitrant metals concentrations measured in monitoring wells attributed to challenging distribution. The permanence of the remedy is continually evaluated through a robust quarterly monitoring program. Lastly, optimization measures for injecting polysulfide at the field-scale using large volume injections will be discussed with respect to equipment, manipulating solution chemistry, and reagent staging.

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