presented by J. Michael “Mike” Hawthorne, PG, REM
This brown bag Webinar is brought to you by the NGWA Aquifer Protection Interest Group.
During this half-hour presentation, you will learn how diagnostic gauge plots (DGPs) provide an essential tool to diagnose unconfined vs. confined or perched LNAPL (light non-aqueous phase liquid) to correctly identify critical confining elevations from a fluid hydraulics perspective, as well as how to estimate the mobile LNAPL interval as an improved input over apparent NAPL thickness (ANT) for LNAPL models.
Historically, most sites with LNAPLs present in the subsurface have been mischaracterized on the basis of ANT gauged in wells. As documented by others, the vertical equilibrium (VEQ) model for LNAPL demonstrates that similar ANT values in different soils represent widely differing LNAPL volumes.
Various modeling tools exist to correctly characterize LNAPL sites on the basis of LNAPL saturations, volumes, and transmissivities. However, most of these tools include ANT as a model input. The VEQ model does not address the problem of exaggerated ANT values due to differing LNAPL hydrogeologic conditions (unconfined vs. confined or perched LNAPL).
Introductory to intermediate.
Participants may earn 0.05 CEUs by attending this brown bag Webinar.
You may also wish to check with your respective regulatory agency regarding recognition of this brown bag Webinar for continuing education credit.
Though free to NGWA members, connections are limited and preregistration is required.
Once your registration is processed, you will receive an e-mail confirming your registration. (Please allow at least one full business day for the processing of your registration.) You’ll receive an e-mail invitation with log-in details five days prior to the presentation date. Click on the “registration” button and complete GoToWebinar®’s brief registration process. You will receive an e-mail confirming your registration for the Webinar, along with the option to add the Webinar information to your Outlook® calendar. Please note: Some Webinars may require organizer approval prior to the delivery of a confirmation e-mail. Once you are online for the Webinar, you will be able to type in your questions, as well as print out related materials. (Please view the NGWA Webinar FAQs page for more information including that for GoToWebinar.)
Information current as of 7-23-2012. For further assistance, e-mail firstname.lastname@example.org or call 800 551.7379 (614 898.7791).
800 551.7379 (614 898.7791 outside the United States)
8 a.m.-5 p.m. ET Monday through Friday
fax 614 898.7786
PO Box 715435
Columbus, OH 43271-5435
National Ground Water Association
601 Dempsey Rd.
Westerville, OH 43081
(614 898.7791 outside the US)
fax 614 898.7786