With this 180 million I can buy my own politician for my island .... :lol::lol: Scott, This is the latest discussions with Gary on the subject of GHG measurements. I have three programs scheduled in the next couple of months in Region 7. If you can arrange to have someone monitor these projects it would give the EMC more support in method development. It seems they are going to follow the same path in this method as in RM25-C except I will be making more input prior to the method being promulgated. That correction process with RM25-C created far too much confusion and we could have included the trap from the beginning. If Mort had told me my proposals were going to be used for anything other than the monitoring they were doing at State, I would have been more clear. In any case we have things in order now so the method should be less trouble. I cannot present anything for this years AWMA conferences unless I get lucky with the scheduling of these projects, but next year should be a shoe in. I may also have data from the new NMOC field analyzer by that time. Agilent is dragging their feet so I may build a complete prototype on my own. I have just about completed the tests on the chiller which can be manually operated in the field for the time being. That will give data to present and the fully automated system can follow at any point after that. Wayne Stollings President Sent: 3/10/2009 11:13:06 A.M. Eastern Daylight Time Subj: GHG analysis Gary, We have finished redoing the MDL study for this. Using the 10 ml sample loop and highest range of the TCD we have a MDL of 0.25 ppm for CH4, 0.26 ppm for CO2, and 0.09 ppm N2O our lowest calibration point is 3.15 ppm CH4, 3.27 ppm CO2 and 1 ppm N2O. We will have a report limit of 1 ppm each for CO2 and CH4 and 0.5 ppm for N20. The other calibration points are 500 ppm and 50000 ppm for CH4 and CO2 and 50 ppm and 100 ppm for N2O at this time. I am getting a daily calibration mixture of 1% CO2 and CH4 and 50 ppm N2O. The upper limit for CO2 and CH4 is 5% for this method as it is run. Anything larger will require the change in range or sample loop. The TCD program allows the change of range within the run but the elution of CO2 and N2O is too close for us to comfortably consider that. A secondary run with a different range or sample loop size would be my preference. The loop for the Method 3-C method allows us to go to 50% CO2 and CH4 and is already an approved method, so that would be my choice at this time. If the GHG method were accepted it would then be a toss up. Of course, there would need to be a separate calibration for each range/sample loop. There would not be any standardized correction for moisture since the sources would be variable in content. We have put together the same system we proposed for LFG except we do not analyze the traps, but just clean them. Using an unheated Method 25 or 25-C sample train we add an old style Method 25/SCAQMD Method 25.1 style trap in line before the flow controlled. It can be packed in wet ice or dry ice to remove the water. I prefer the dry ice because it removes more of the junk that would hit the column, but wet ice water will work too. The trap holds plenty of water so there is little concern it will be overloaded. Unlike our proposal for LFG we do not plan on any analysis of the trap, but just a "cleaning" of the water. Because these traps will not be analyzed we are painting the exterior body red to ensure they are not confused with sample traps. Thus, the traps are more like a sturdier impinger system. An impinger similar to the SCAQMD Method 25.3 could also be used provided the volume was sufficient. I prefer the metal trap because it can be sealed more easily, there is less chance of leakage, and it is much more sturdy compared to the glass. Wayne Stollings President In a message dated 2/3/2009 7:55:14 P.M. Eastern @epamail.epa.gov writes: Hi Wayne, Thanks for keeping me informed about this. We are just getting started with the issue of greenhouse gas emissions (GGE) - the first step is to get a national inventory of GGE from different industry categories. We haven't gotten as far as specifying any methods for measuring the pollutants. All that's happened so far is doing a quick survey to see if there are existing procedures to measure all of the important ones. We concluded that there were techniques for measuring all of them including N2O, but we didn't decide what the best technique might be. My quick assessment was that the "best" technique might depend on the desired sensitivity. GC/ECD is apparently pretty sensitive for N2O, but would be a pain if you had to move the GC around to field locations. GC/TCD is a really good idea for CO2 & Methane, but might not be sensitive enough for N2O depending on the level that we needed to measure. However, because it's simple, rugged, and reliable, I think it would be a great starting point. Gary
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I got this one too. OH he better stop telling so many people after all his life is at stake. :mrgreen:
