High Purge Volume Sub-Slab SamplingHigh Purge Volume Sub-Slab Sampling • Provides more information...
Transcript of High Purge Volume Sub-Slab SamplingHigh Purge Volume Sub-Slab Sampling • Provides more information...
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High Purge VolumeHigh Purge Volume SubSub--Slab SamplingSlab SamplingFormer Paragon Electric
Two Rivers, Manitowoc CountyPart III, Case Study
Annette Weissbach, WDNR-Green BayWisconsin’s Vapor Intrusion Guidance
FET – March 2011
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Lake Michigan
Two Rivers
to Manitowoc
Paragon Electric
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~27 acres
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History• Manufacturer of electrical components (motors,
timers, switches). Property vacant/mothballed since the late 1990s. TCE used as parts cleaner until 1991, Investigation began 1985, continued through 2000s
• Soils: 40 feet fine sand, 1-5 feet clay, fine sand 15+ feet, Silurian bedrock ~90 feet
• Groundwater 7-14 feet below grade• 1993-2002 Source Remedy: soil vapor
extraction with groundwater sparging (ceased in 93), and groundwater extraction.
• Estimated 1600 pounds (~ 123 gallons) of TCE removed.
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History
• 2006: Conditional closure granted w/GIS registry: soil and groundwater
• 2008: TA request for “clean” closure options
• 2008: joined the VPLE process• 2009-2010: Phase I/Phase II• 2009: VI Survey
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Paragon Electric successive plumes
(guesstimated!)
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High Purge Volume Sub-Slab Sampling
• Provides more information by removing a larger volume of soil gas
• Removes soil gas at a consistent rate, 25 to 100 scfm for a period of up to two hours.
• Removes sufficient volume of gas from a 6-inch gravel layer (30% porosity) to withdraw all soil gas within a radius of 25-50 feet.
• Concentration of extracted vapors monitored as a function of time
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High Purge Volume Sub-Slab Sampling
• Field screening with slip-stream samples • Communication test points (CTP)• Applied vacuum measurements• Gas velocity measurements• Smoke tests (for leakage)• 6-liter summa canister for 30-100 minutes• Transient response tests
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Former hazardous waste storage area Former TCE Vault area
Mini HPV test on former SVE well
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Todd A. McAlary, M.Sc., P.Eng., P.G.
Practice Leader - Vapor Intrusion
Geosyntec Consultants, Inc.
130 Research Lane, Suite 2
Guelph, Ontario
N1G 5G3
(519) 822-2230 ext 239
Fax (519) 822-3151
Cell (905) 339-7066