Mass Flux and Mass Discharge

ITRC Disclaimer, Privacy, and Usage PoliciesThe training page, with links to registration or archive, Links page, and feedback, for the Use and Measurement of Mass Flux and Mass Discharge course is available at http://www.clu-in.org/conf/itrc/ummfmd/

Remaining Simulcast Questions and Answers from June 10, 2014

Question 1: is the reference for the Reese AFB site (slide 73) in the ITRC doc as the Payne 2008 ref?

Remaining Simulcast Questions and Answers from January 9, 2014

Question 1: What type of condition (data) should I consider to choose appropriate measurement methods? - Participant from EPA; Oklahoma

Question 2: Years ago Murry Einerson emphasized high resolution short screen or multi-port vertical profiling. You said the long screens may be appropriate for an average. Is this a new development? - Environmental Consultant; Irvine, CA

Question 3: Pumping method. Provides valuable source characterization data when combined with time (ideally many years): how mass flux changes with time. especially with mixed solvent sources - Environmental Consultant; Toms River, NJ

Remaining Simulcast Questions and Answers from February 16, 2012

Question 1: Regarding integration of the subject technology into more frequent regulatory use, how will the use of mass flux and discharge be handled statistically and geostatiscally in the new RCRA guidance (EPA, 2008) being developed and the new document from the ITRC Groundwater Statistics and Monitoring Compliance team? What are the state and federal regulators plans to use these data in conventional gw data bases used for compliance demonstration? - Participant from Department of Energy Environmental Management; Washington, DC, United States

Question 2: In Florida we are finding that State Environmental Agencies (GW Cleanup) are wary of different aspects of the program (Passive Flux meters). What are any concerns from EPA? - Participant from Army National Guard; Starke, FL, United States

Question 3: Are there any examples of Mass Flux or Mass Discharge estimates in fractured bedrock? - State Regulator; Augusta, ME, United States

Remaining Simulcast Questions and Answers from January 13, 2011

Question 1: Please comment on geometric or logrithymic interplolation between data points... what methods? - Environmental Consultant; Columbus, OH, United States

Question 2: Will the Mass Flux Toolkit be updated for Windows 7 (64-bit) and Excel 2007/2010? - Participant; Tucson, AZ, United States

Question 3: With respect to building transects (slide 31), will the vertical plume size be measured using, for example, a cluster well (for example, 3 1-inch wells of 15, 20 and 25 feet below surface)? - Environmental Consultant; Tallahassee, FL, United States

Question 4: It was mentioned that mass flux is based upon horizontal movement of the groundwater. Would this method be limited with DNAPL chemicals like tetrachloroethene? Also, has there been studies utilizing mass flux measurements with hexavalent chromium? - State Regulator; Indianapolis, IN, United States

Remaining Simulcast Questions and Answers from November 18, 2010

Question 1: If using wells for your transects, the well concentration is a vertical average over the screen length. Using this to average a concentration across a horizontal distance is essentially averaging averages. How many orders of magnitude would be considered a fairly accurate measurement. - Local Government Participant; Madison, WI, United States

Question 2: Most of the demonstrations seem to assume direction and magnitude of ground water flow is relatively constant across site. What if there is significant variation in the direction and magnitude of the hydraulic gradient across the site. Are their ways of accommodating this in the methods presented? State Government Participant; Wilkes-Barre, PA, United States

Question 3: When using multi-level screened wells, can I use USGS passive diffusion bags to get contam concs in gw? For example, if I have ten screened intervals separated by 10 feet of unscreened casing, can I hang 10 USGS PDBs on ropes 10 feet long? - State Government Participant; Salt Lake City, UT, United States

Question 4: It seems that unless the screen filter pack is customized to the formation grain size distribution for each discrete monitoring point, the convergence of groundwater streamlines through the well screen will occur to a much lower degree in a gravel formation compared to sand or silt. Hence, the passive mass flux meter will underestimate mass flux in the gravel zone (i.e. the difference in flux between gravel and silt will be lower than the true value). What approaches have been used to mitigate this bias, if any? - Environmental Consultant; Columbia, MD, United States

Question 5: In the Tech Overview document, figures 4-2 & 4-3 show very close vertical screened intervals. Do you install bentonite annular seals between the screened intervals? - State Government Participant; Salt Lake City, UT, United States

Question 6: I like this concept, but well installation and sampling would be very expensive. For example, in the Tech Overview document, figures 4-2 and 4-3, you would collect/analyze 210 gw samples from the 3 transects. The analyses alone would cost $21,000. This does not include consultant sampling time. - State Government Participant; Salt Lake City, UT, United States

Question 7: are the databases prepared by DOD and Einarson and Mackey freely accessible on line? - Environmental Consultant; Long Beach, CA, United States

Question 8: has max flux estimation been successfully used in active ozone sparge remediated sites? - Environmental Consultant; Long Beach, CA, United States

Question 9: in case of large variety of K and C, what is the optimum size of the cell; what is more important to consider C or K in the decision? - Environmental Consultant; Long Beach, CA, United States