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Feb
12

H2A’s Dr. Ranga Muthu to Provide Training on API’s LNAPL Transmissivity Spreadsheet

written by Andrea

H2A’s Dr. Rangaramanujam “Ranga” Muthu, co-author of the American Petroleum Institute’s (API’s) new Microsoft ExcelTM spreadsheet tool for estimating LNAPL transmissivity using baildown test data, will present the first part of a two-part training session on the spreadsheet on February 27, 2013, from 1:00 to 1:30 PM EST.  This session is only available to National […]

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Aug
15

H2A is Using LNAPL Transmissivity to Make MDPE More Efficient and Cost Effective

written by Shannon

H2A recently completed an evaluation of LNAPL transmissivity (Tn) at a major international airport in Texas.  The results are being used to further enhance the existing mobile dual-phase extraction (MDPE) remediation strategy for the site by focusing efforts on wells exhibiting the highest LNAPL transmissivity.  By doing so, H2A has realized increases in product recovery […]

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Jul
8

ANSR Listed as Resource in USEPA’s TechDirect Newsletter

written by Shannon

The June 2011 issue of Applied NAPL Science Review (ANSR) was cited in the U.S. Environmental Protection Agency’s July 2011 issue of the TechDirect Newsletter, a publication that identifies new guidance resources related to the assessment and remediation of contaminated media.  ANSR was listed as a web resource that “provides technical insight into the science […]

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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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Apr
19

Texas Wildlife in Our Own Backyard… Literally

written by Shannon

H2A recently made note of a new visitor frequenting our off-site system maintenance facility.  A common gray fox has taken up residence and is making itself at home in the tall foliage behind the building. Here are three things you may not know about foxes – they are omnivores, eating both meats and vegetables; they […]

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Apr
14

Current Texas Drought Conditions

written by Shannon

Texas is currently under drought conditions that may be more substantial than many people realize.  The Texas drought map (republished from the noted source) dated April 5, 2011, demonstrates large areas of Texas that are under severe, extreme, or exceptional drought conditions.  Water conservation requirements have already been triggered in some cities located in harder-hit […]

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