Hi Dave, I'm not sure if you remember me, but I took the GW Modelling class out in Denver 3 years ago. I was an intern for Pierre Glynn at the time. I'm now working at the Atlanta Georgia District and am attempting to use pHreeqc on a project I'm on. I'm trying to do basic speciation and am not sure if I'm inputting the DO correctly. I was hoping you could help. I am trying to speciate groundwater, spring, and surface water samples. I have DO measures for all of these but I assume the surface water is handled different since it is open to exchange with the atmosphere. I know that the DO is defined in the solutions section as O(g) phase but the alpha version of the program keeps prompting me to input a SI. Do I put in the SI as -0.7 (partial pressure in the atmos)? Is this OK to do for wells in a closed system? For the surface waters, do I add gas phases for O2 and CO2 with atmospheric pp's? HELP! HELP! HELP! Feel free to call or write. Which ever is more convenient. Thanks! Dianna Crilley
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