Empirical Attenuation Factors Predictions & Observational Data

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Presentation transcript:

Empirical Attenuation Factors Predictions & Observational Data Helen Dawson, Ph.D. US EPA Region VIII Denver, CO Ian Hers, Ph.D. Golder Associates Vancouver, BC, Canada Robert Truesdale RTI International RTP, North Carolina

Empirical Attenuation Factors 2001-2002 Evaluations (Helen Dawson) 2004 Evaluations (Ian Hers) Future Evaluations (Robert Truesdale)

Measured Attenuation Factors 2001-2002 Database Summary 15 sites, 15 VOCs, 274 total residence/chemical combinations 35 BTEX; 239 CHC residence/chemical combinations 99 sites with IA > 10-6 IA RBC (84 CHC, 14 BTEX) 68 sites with IA > 10-5 IA RBC

2001 – 2002 Empirical Attenuation Factors Groundwater-to-Indoor Air All residences and chemicals with concentrations above MDLs

Factors evaluated (2001 – 2002) Chemical type Foundation type Soil type Depth to source

2001 – 2002 Empirical Attenuation Factors Chlorinated Hydrocarbons vs 2001 – 2002 Empirical Attenuation Factors Chlorinated Hydrocarbons vs. BTEX

2001 – 2002 Empirical Attenuation Factors Influence of Foundation Structure? Groundwater

2001 – 2002 Empirical Attenuation Factors Influence of Foundation Structure?

2001 – 2002 Empirical Attenuation Factors Influence of Soil Type?

2001 – 2002 Empirical Attenuation Factors Depth to Groundwater?

2001 – 2002 Empirical Attenuation Factors Conclusions Measured attenuation factors range from 10-2 to 10-7 with median values around 10-4. Influence of foundation type, soil type, and depth to water on the empirical attenuation factors is unclear. Higher ranges of attenuation factors are observed for BTEX compounds; median value is around 10-5.