Document 4aeajo50BVZ8Lda8K0OjrJgje

AR226-2286 Frank D Sm ith 05/13/2002 08.-25 AM To: Catherine A Barton/AE/DuPont@DuPont cc: Kenneth N Wood/AE/DuPont DuPont, James F Riley/CL/DuPont@DuPonl, Craig L Bartlett/AE/DuPont@ DuPont Subject: TEFLON AT SPRUANCE Cathy FYI Frank Forwarded by Frank D SmrUVAE/DUPont on 05/13/2002 08:24 AM - W . sidoros J Zanikos SfisiHSHMarai To: Michael R Liberati/AE/DuPont@DuPont cc: Andrew S HARTTEN DuPont, Frank D Smith/AE/DuPont DuPont, M ichael J LukasODuPont Subject: TEFLON AT SPRUANCE M ike, the screening levels have been set in W VA as part of the consent order. EPA region III and V will adopL drinking water soil 150ppb 240 ppm air 0-1 to 6 micrograms/ meter (the independent group will narrow this range in the future. The Dupont CEG number is 0.3) I would shoot for the low end of this range The CRG objective at Spruance is to identify the potential need for operating changes such as the additon of wastewater treatm ent equipment or air emission controls to m eet these numbers. This w ill allow the business to montetize these controls, so that the business sales agreem ent can address the issue o f who will pay for these controls. Just to ground yo u , the m ax concentration in groundwater (not drinking w ater) at W ash Works is in the low 30ppb range. Drinking w ater is much low er. Onsite Surface soil concentrations at W W are below the number. Max air concentrations are in the low end of the range. I suggest a combination of sampling and process knowledge approach to develop a mass balance around the process. Sam ple the wastewater stream, including scrubber effluent. Calculate the concentration in the river (assume that is influent to Hopewelf) Assume that mass emitted thru the air Is the difference between w hat cam e in the product and the wastewater mass thru air modeling, calculate the m ax concentration in the air. Altem itively, back calculate the mass needed to create an ambient air m ax concentration at the screening level and then thru process knowledge assess the potential to emit! that quantity. You could do the sam e approach for w ater. Frank, i suggest as sim ilar approach for C ird eville' C AB000022 E X D 546871