从PFAS现场调查和概念现场模型开发中吸取的经验教训.pdf

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1、Lessons Learned from PFAS Site Investigations&Development of Conceptual Site ModelsChris Wenczel,P.G.Director/HydrogeologistEnvironmental Resources ManagementOctober 16,2024Case Study Site#1Somewhere In The Midwest The Wind Blows&A River Flows.Air Dispersion,Deposition&Soil InvestigationIndustrial W

2、astewaterGroundwater/Surface Water InteractionsCase Study Site#1Somewhere In The Midwest The Wind Blows&A River Flows.Air Dispersion,Deposition&Soil InvestigationIndustrial WastewaterGroundwater/Surface Water InteractionsAir Dispersion,Deposition Modeling&Off-site Soil Investigation-CSM BuildingPFAS

3、 particulate emissions,dispersion and deposition can have far reaching impacts soil,leaching to groundwater,groundwater discharge to surface water and/or direct deposition.Industrial park setting-facility releases PFAS-emitted in air discharge stacks.Stack testing was performed to estimate PFAS part

4、iculate mass discharge and used to perform air dispersion/deposition modeling to estimate predicted deposition rates and footprint.Footprint was used to plan off-site surficial soil sampling program.Soil sampling performed on a 500 grid over a 207-acre area.Land use within grid area:buildings,paved

5、surface,roads,surface drainage/creeks and agricultural fields.Off-site access to private properties was required.Off-site Surficial Soil Sampling Scheme For PFASTotal PFAS In Off-site Surficial SoilTotal PFAS In Off-site Surface Soil Expanded ResultsSummary-Air Dispersion,Deposition Modeling&Off-sit

6、e Soil Investigation Isoconcentration plot of total PFAS in surficial soil very similar to modeled deposition footprint and prevailing wind data(wind rose).Grid sampling locations were adjusted to edge of paved areas to avoid penetrations.Increased PFAS concentrations anticipated at edges of pavemen