GRA Southern California Branch
In cooperation with
South Coast Geological Society
Proudly Presents
David Keith Todd Distinguished Lecture Series
Sponsored by GeoSyntec Consultants, Regenesis, and Luhdorff & Scalmanini, Consulting Engineers
The movement of light non-aqueous phase liquids – a risk perspective
Dr. David Huntley, Professor Emeritus of Geological Sciences,
San Diego State University
Scholastic Sponsor: PTS Laboratories
RSVP -- http://www.grac.org/screservation
Natural attenuation of dissolved phase contaminants is widely recognized and consideration of it has become a standard part of assessing the risk of future contamination. Stabilization of the footprint of a dissolved phase plume as a result of natural attenuation is well understood. Much attention has turned to the source of many of the dissolved phase plumes, a non-aqueous phase liquid (NAPL) with significant soluble components. Both regulatory agencies and responsible parties want to know the velocity of the NAPL, whether the NAPL footprint is likely to expand, and, if so, the future extent of the NAPL. Remediation of a NAPL is directed at both decreasing the mass of the soluble components contributing to the dissolved phase plume and to limiting the potential expansion of the NAPL source. Significant lateral or downgradient expansion of the NAPL source can result in an expanded dissolved phase plume even under conditions where degradation rates are high. The success of source area remediation is often judged by the degree to which the mobility of the NAPL is reduced or eliminated.
Once the source of a NAPL (e.g. leaky tank, pipeline break, surface spill) is eliminated, there are several physical processes that limit the mobility of the NAPL. As the NAPL spreads, a fixed volume of NAPL moves into an increasingly large volume of rock or soil, thereby decreasing the saturation of the NAPL and, as a result, the mobility of the NAPL. At the trailing edge of the NAPL, water will displace NAPL, ultimately stabilizing the NAPL by reducing NAPL saturation to it’s residual saturation. Movement at the leading edge of the NAPL source area will be limited by the need for NAPL to accumulate to a sufficient degree that the capillary entry pressure is exceeded. This talk will discuss the physical controls on the mobility of NAPLs (emphasizing LNAPLs), a variety of approaches to assess the mobility of NAPLs, and the typical time frames that should be considered when putting NAPL mobility into a risk context.
| Dave Huntley is a Professor Emeritus of Geological Sciences at San Diego State University. He has taught graduate and undergraduate classes in groundwater hydrology for 31 years after obtaining his Ph.D. at Colorado School of Mines. His research focus is the distribution, mobility, and dissolution of non-aqueous phase liquids, the effects of geologic heterogeneity on dissolved phase solute transport, groundwater flow and solute transport in fractured rock, and the application of geophysics to groundwater hydrologic problems. He is currently Associate Editor of the journals Ground Water and Ground Water Monitoring and Remediation. In addition to his research and journal activities, he is a private consultant for both industry and regulatory agencies throughout the country. |  |
---------------------------------------------------------------------------------------------------------------------------------------
March 2013 Local Scholastic Sponsor
PTS Laboratories
PTS Laboratories is a leading provider of geotechnical and core analysis services to engineering firms, consultants, and government agencies. We are experts at measuring Vapor Intrusion, NAPL Mobility, physical properties of soil and rock from hydrocarbon contaminated and hazardous waste sites. PTS also offers customized testing such as bench scale testing for soil vapor extraction and thermal processes including steam or hot water displacements. In addition, chromatographic fingerprinting of hydrocarbon contaminants can be conducted and used to ascertain or eliminate potential sources of contaminants. PTS holds a valid Soil Import Permit from the USDA for receiving samples from outside the US.
Please contact Rachel for more information:
Rachel Spitz
Project Manager
PTS Laboratories, Inc.
8100 Secura Way
Santa Fe Springs, CA 90670
Tel. (562) 347-2500 ext.704
www.ptslabs.com
---------------------------------------------------------------------------------------------------------------------------------------
Important Branch News
Scholastic Sponsorship Program. The Southern California Branch continues its ongoing scholastic sponsorship program, with local sponsors supporting our annual scholarship fund for students who are engaged in groundwater studies. If your organization is interested in participating as a sponsor for a future event, please contact a Branch Officer.
To RSVP, go to -- http://www.grac.org/screservation
Location: Doubletree Club Hotel
7 Hutton Centre Drive, Santa Ana
Tel: (714) 751-2400
The March 4, 2013 format will consist of:
Registration - 5:30 to 6:30 PM
Dinner, and Announcements - 6:30 to 7:30 PM
Keynote Speaker - 7:30 to 8:30PM
Questions and Answers- 8:30 to 8:45 PM
Cost: $25 members, $30 non-members, students $10. Coffee and tea included. Reservations can be made online at http://www.grac.org/screservation. Please RSVP by 12:00 PM (Noon), Friday, March 1, 2013. Space is limited to the first 100 people.
Cancellation Policy: GRA will accept cancellations with no charge until 12:00 PM (Noon) on Friday, March 1, 2013. Cancellation after that time, or non-attendance, will require full payment. Send cancellation requests to dbadmin@grac.org. Thank you for your cooperation.
TWO IMPORTANT NOTES:
1) The Hotel now requires valet parking, but parking is free for dinner attendants- make sure you mention that you are attending the Southern California Branch GRA Dinner meeting.
2) There is also a Doubletree Hotel nearby - not to be confused with this Doubletree Club
DIRECTIONS:
From 55 Fwy South: take MacArthur offramp turn right (west). From 55 Fwy North take MacArthur offramp and turn left (west) on to MacArthur. Head west to Main Street and turn left (South). Turn Left on Sandpointe continue through Hutton Center Drive and you are there.
For information, please contact Peter Murphy with Kennedy/Jenks at 949.261.1577 or Emily Vavricka with EEC, Inc. at 714.667.2300.
|
|||||||||||||||||
 |
|||||||||||||||||
|
|||||||||||||||||
|
|||||||||||||||||
