Greenpoint Petroleum Vapor Intrusion Study Thanks to Ed Hampston & Kevin Hale NYSDEC Site History • Petroleum Refining Operations Began in 1866 • More than 50 Refineries Along Newtown Creek by 1870 • Refinery Operations Ceased in 1966 • Coast Guard Finds Oil Slick in 1978 • Bulk Storage Ceased at ExxonMobile in 1993 • Still Ongoing at BP 1978: The Coast Guard Discovered Oil Floating on Newtown Creek 10 20 2 Estimated 17 Millions Gallons of LNAPL 5 1 0 1 5 15 1 10 0 5 2 1 0 2 0 1 1 0 1 0 0 0 6 8 2 4 0 0 2 1 2 1 0 9.5 Million Gallons of LNAPL Recovered Conceptual Cross‐Section of the Greenpoint Oil Spill ? Near Source – Industrial Area • Product Recovery Underway ‐ Exxon Mobile Currently Removing ~100,000 Gallons/Month • High Concentrations of Benzene and MhMethane in Some Shall ow SilSoil Gas PiPoints • SVE System Installed to Mitigate Methane and Other VOCs in Shallow Soil Gas 10.0 3.0 2.0 1.0 0.0 9.0 8.0 7.0 6.0 5.0 4.0 0 Methane 100000 ppmv 200000 BGS Methane Benzene Co2 O2 Benzene 2.5 7.5 300000 Monitoring 204000165000 405000 57300 0 Points 100000 MP ­ 1 1S Benzene (() 200000 2008 ‐ 1D ) 300000 ug/m3 400000 19.4 0.3 20 1.1 500000 0 5 CO2 10 % 15 20 O2 % 25 Methane ppmv Benzene ug/m3 CO2 % O2 % 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 0 0 5 0 10 15 20 25 0000 0000 0000 0000 0000 0000 00 00 00 00 00 00 4 1 2 3 1 2 Monitoring PointsMP-10 10S ‐ (2008)10D BGS Methane Benzene Co2 O2 2680 1630 3.8 19.6 2.5 98100 338000 20 0.2 7.5 Methane ppmv Benzene ug/m3 CO2 % O2 % 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 00 00 00 00 55 00 55 00 55 00 1 1 2 2 10000 10000 MP­2 BGS MethaneMonitoring Benzene Points 2S ‐ 2D Co2 O2 ? 51.6 0.20 2.5 20.7 31800 91000 7.5 15.8 0 Structure Sampling O2 Fosters Biodegradation Results of Greenpoint Structure Sampling for Benzene Benzene Ambient First Floor 14 BtBasement Subslab 12 10 8 ug/m3 6 4 2 0 Sample ID RltResults of Struct ure SliSampling for m,p ‐XlXylene m,p-Xylene Ambient 70 First Floor Basement 60 Subslab 50 40 g/m3 u 30 20 10 0 Sample ID • Conclusion: • NYS DOH and ATSDR conclude that petroleum‐related compounds in the Exxon/Mobile Greenpoint Off‐site free‐ product plume area are not expected to harm people’s health via the soil vapor intrusion pathway. • Concentration of VOCs in most homes generally similar to concentrations in homes unaffected by VI. • In homes with elevated concentrations of VOCs, the SS concentrations were lower. Most likely due to indoor source, not VI. Hyde Park NY Petroleum Station Sources BTX vs MTBE Distribution Thank You.