Document vmgND4EJBngJzpeM27GR5ZOw

Daikin America Decatur Plant Monitoring January 15, 2004 AR226-2353 EXPQ00161 v*_-/ Daikin America Decatur Plant Monitoring Background Air modeling Surface water/sludge Groundwater/soil Next steps EXP000162 Figure A2. A erisi PtoBgpipt Decatur .'Uabaina EXP000163 Daikin America Decatur Plant Background Daikin completed original construction of the facility in 1993 Fluoropolymer manufacturing operations started in early 1994 Telomer finishing facility constructed in 2000 and commercial production started in 2001 EXP000164 Daikin America Decatur Plant Stack Monitoring /Air Dispersion Modeling Dispersion modeled using the EPA approved industrial source complex short term 3 (ISCSTS) model The 12-month period between October 5, 2002 e and October 4, 2003 was selected to assess ambient impacts resulting from actual emissions of PFOA from Daikin's operations PFOA emissions during this period was 397 pounds EXP000165 Daikin America Decatur Plant Dispersion Modeling Results Daikin contribution only Fence line |ig/m 3 0.13 3M/Daikin Property Boundary (Xg/m3 0.02 Daikin and Dyneon Cumulative 0.13 0.02 Based on Daikin emission rate of 397 pounds in 1 year period Daikin America Decatur Plant Monitoring - Surface Water and Sludge Two effluent points - Effluent to Tennessee river from Fluoropolymer process - Outfall to POTW from Telomer Finishing process Wastewater treatment sludge to subpart D landfill Storm water runoff - 2 locations EXP000167 Daikin America Decatur Plant Monitoring - Groundwater/Soil Six points selected based on likely groundwater flow in subsurface above limestone bedrock Wells drilled and sampled in November 2003 Only 2 of 6 wells produced water. During the drilling of the wells, soil samples were taken every 5 feet down to groundwater Split spoon sampler EXP000168 Daikin America Decatur Plant Monitoring - Soils Preliminary Results (ppb) Depth MW -1 (Feet) 5-ooo0 0 530 Oto) 5 NR 10 111 S\U 15 Wetvi W 20 rta r a ^ i (a beiCoCV'PeZ'&,lu^ liprtsvvr \iyd eico. 25 30 35 Cff &*ch jjotM~, NR - No Recovery MW- 2 1165 3200 60.8 47.8 50.1 79.1 76.4 25.1 MW-3 NR 416 41.8 39.3 30.3 MW- 4 22.7 73.8 770 416 121 NR 49.0 MW- 5 48.9 9.69 205 88.4 259 138 MW- 6 52.2 163 954 596 183 86.4 </ Daikin America Decatur Plant Monitoring - Soils N o clear pattern Potential sources of contamination ? - Land application of sludge - Deposition from air emissions EXP000170 EXP000171 tlll Daikin America Decatur Plant Next Steps - Air releases Considering air deposition monitoring Substantial reduction in air emissions - Surface water Monitor storm water runoff - 2 locations Continue effluent monitoring - Soils/groundwater Better characterize hydrogeology Additional groundwater monitoring Additional soil monitoring Wit