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Jun
16

H2A Performs 12-Day MDPE Event in Angleton, Texas

written by Shannon

H2A is currently performing a 12-day, mobile dual-phase extraction (MDPE) event at a former petroleum storage tank site located within TxDOT right-of-way in Angleton, Texas (the Site).  This is the latest of seven MDPE events performed by H2A at the Site over the past several years.  During a 12-day event performed in March of this […]

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Jun
3

H2A Completes LNAPL Conceptual Site Model (LCSM) Updates for a Large-Scale Refinery

written by Shannon

H2A’s J. Michael Hawthorne, PG, Shannon Walker, PE, and Si Xu, EIT, recently completed an extensive redesign of the LNAPL Conceptual Site Model (LCSM) for a large-scale oil refinery located in southeast Texas. The analysis included a detailed review of all gauging and well construction data, fluid physical properties, aquifer properties, multiple LNAPL recovery and […]

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May
25

LNAPL – It’s Not Just Unconfined

written by Andrea

Abstract of presentation to be given by Mike Hawthorne of H2A (coauthors Andrew Kirkman of AECOM and Mark Adamski of BP America) at the LNAPL Site Management Strategies Session of the 2011 Battelle Bioremediation and Sustainable Environmental Technologies Conference, Reno, Nevada, June 27-30, 2011. Background. Existing LNAPL distribution literature is heavily biased towards ideal unconfined conditions […]

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May
6

LNAPL Remediation Drivers

written by Andrea

One way to look at light non-aqueous phase liquid (LNAPL) drivers for remediation is to break them down into: (1) physical science issues and (2) human science issues.  Physical science drivers include saturation and composition risks.  Saturation risks are primarily related to migration of LNAPL, if the LNAPL mass present is great enough for migration […]

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Apr
21

Employee Spotlight – Shannon S. Walker, PE

written by Andrea

Shannon has been a Senior Remediation Engineer at H2A for almost four years.  She holds both a MS and BS in Chemical Engineering, and a BS in Civil Engineering, from West Virginia University in Morgantown, West Virginia.  She has worked in environmental consulting for over ten years, specializing in site remediation and regulatory compliance. Q: […]

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Mar
31

H2A Engineers Evaluate Feasibility of Converting an Existing DPE System to TPE

written by Shannon

H2A’s Shannon Walker, PE, and Si Xu, EIT, recently completed an engineering evaluation of the feasibility of converting an existing dual-phase extraction (DPE) system to two-phase extraction (TPE). The conversion would increase groundwater drawdown and applied vacuum, thereby improving groundwater capture. The evaluation involved determining necessary well flows and associated friction losses based on the […]

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Mar
17

LNAPL Transmissivity Measurement Methods: A Preview of Developing Guidance (Webinar by Mike Hawthorne)

written by Andrea

The Aquifer Protection Interest Group is proud to present its first brown bag webinar of 2011 March 23, 2011, 1-1:30pm EST Light Non-Aqueous Phase Liquid (LNAPL) transmissivity (Tn) can provide substantial improvements to LNAPL hydraulic mobility and recoverability analyses over traditional metrics such as LNAPL thickness in wells. Although methods to measure Tn have been […]

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Mar
4

H2A Presents “An Exploration of LNAPL Transmissivity” to the USEPA

written by Andrea

H2A recently presented an in-depth training webinar to the USEPA titled “An Exploration of LNAPL Transmissivity.”  H2A’s Mike Hawthorne identified LNAPL transmissivity as an improved metric (versus LNAPL thickness or recovery data) with respect to LNAPL mobility, recoverability, and remediation operational progress.  Five techniques used to measure LNAPL transmissivity were reviewed in detail and the […]

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Mar
1

H2A Presents LNAPL Webinars to the Missouri DNR

written by Shannon

H2A’s Mike Hawthorne recently presented two, back to back, one-hour training webinars to the Missouri Department of Natural Resources. The first explored basic tenets of LNAPL science, including multiphase saturation distribution concepts and the benefits of multiphase extraction for both compositional change and saturation reduction in LNAPL remediation. The second webinar discussed LNAPL transmissivity as […]

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