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Assessment and Cleanup of Valley Post and Sawmill Site: History and Remediation Efforts

The Valley Post and Sawmill, primarily a sawmill that operated until approximately 1996, faced numerous environmental inspections revealing violations of hazardous material regulations. Following the 1987 joint inspection by the EPA and WYDEQ, improper waste handling led to significant contamination issues, including PCP residues in storage tanks. Subsequent assessments and cleanup efforts were initiated in 2008 and 2009 to address these issues, involving extensive soil excavation and tank cleaning. The project aims for completion in late 2010 or early 2011, ensuring environmental safety and compliance.

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Assessment and Cleanup of Valley Post and Sawmill Site: History and Remediation Efforts

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  1. Valley Post and Sawmill Craig Myers, OSC

  2. Site History • Primarily a sawmill • Began treating posts in the early 1980’s • Operated until approximately 1996 • EPA and WYDEQ joint inspection in 1987

  3. 1987 Inspection

  4. 1987 Inspection

  5. 1987 Inspection • F032 not promulgated until 1988 • Inspection identified numerous imminent violations when F032 is promulgated • No drip pads • Improper storage • Dumping of spent solution • Lack of follow-up by both EPA and WY DEQ RCRA for unknown reasons.

  6. DEQ requests assistance • DEQ “learns” of property - Oct 2008 • Locate retort and solution tanks in Guernsey • Request EPA assistance to assess tanks - May 2009 • Follow-on request to assess former facility

  7. PO sends several loads of scrap steel to recylcer • PO claims that the tanks were cleaned prior to transport • Tanks are refused until they are “processed” • Scrapper can’t locate a large metal shear before WYDEQ finds the tanks.

  8. Guernsey Assessment • Both tanks still contain/are waste • PCP/wood treatment process equipment exempt from “RCRA Empty” • 40 CFR 261.35 • Deletion of waste code • Retort tank - 8,000+ ppm PCP • Retort tank still contains last load of posts • Both tanks have 3/8” holes. • CID contacted • Potentially criminal RCRA/DOT violations

  9. VP&S Assessment • June 2009 • Confirming presence of PCP • Attempt to delineate • Use of GeoProbe • Field screen based upon color, odor, PID/FID • Lab Samples indicated larger source area • Color and PID/FID not reliable as a screen

  10. VP&S Assessment • Returned September 2009 • Mobilized EPA mobile lab w/ SVOA GC/MS • 80+ soil samples analyzed in 2 days • Full characterization, no data gaps at demobilization.

  11. Tank cleaning • Tanks contain flammable residue • Cannot be legally offered for transport. • Waste code can be deleted, steel recycled. • Stringent process required by 40 CFR 261.35 • Dioxins ND below 10-50 parts per quadrillion in the final rinse.

  12. Removal at VP&S • Tasks • Construct treatment cell • Grub/clear debris • Grade • Excavate source area • Finish cleaning tanks • Solvent rinses • Thermal destruction

  13. Excavation/Treatment

  14. September 2009 - Removal Site Evaluation June 2010 - Removal Action - treatment area 90% complete

  15. Final Stats • Approximately 800 cubic yards of soil excavated • Approximately 4 tons of steel sent off-site as F032 waste to be smelted • Approximately 2 tons of steel recycled. • Treatment is in process • Completion is forecast for 4th quarter FY10 or 1st quarter FY11.

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