Document NGgEDwoZoymKJbnnpgBd5XGLV

AR226-2154 lA Catherine A Barton '^^dP'^sl^!^!<^''<VS^ j( 06/27/2001 0334 PM To: crc Sublecl: Dabble J Mulrooney/AE/DuPontQDuPont, Robert F PinchoVDEWAE/DuPont@DuPont Catherine A Barton/AE/DuPontQDuPont Recap of our meeting Just so we're on the same page (and so I can remember what we said we'd do a week from now), I've summarized some notes from our meeting today. If any of this tooks incorrect to either of you, please holler. Air Risk Debbie will run an additional air dispersion modeling case ("Case 5") to represent the following conditions: Release rate = 0.03 g/s Stack flow rate = 10,000 scfm Stack Velocity = 100 Ws Stack Height =85 ft Building Height =55 ft Temperature = 298 K We will compare the Case 5 concentration results to the CEG for air of 0.3 ug/m3 to ensure these design conditions meet our guidelines with a "reasonable level of comfort". Drinking Water Risk Debbte will pass along the input file to Cathie to be run in risk mode at 1 g/s to provide revised input tor deposition calculations. Cathie will explore the ulitmate fate of all the emissions leaving the stack (ie, 0.03 g/sec for a year which equals 2086 Ibs/yr by my calculations). Specifically, we would like to be able to create a mass balance of all the compound leaving the stack. Cathie will validate her assumptions about the appropriate annual deposition rates and watershed surface area and finalize her calculations. We will compare the new water concentration results to the CEQ for water of either 1 ug/i or 3 ug/l, depending on results from the air exposure to ensure the design conditions meet our drinking water guidelines with a "reasonable level of comfort". Fish Risk Using the water concentration calculated above, a BCF of 10, and fish consumption rates recommended by the Environmental Factors handbook, Cathie will compare expected doses from fish consumption with our guideline of 730 ug/yr. Final Payetteville Answer We will provide final verbal answers for air and water risk by July 11, with the report following. Washington Works We will provide a rough scope and estimate for the new work that was discussed by July 9. CAB000202 EID547051