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Phone: (714) 730-5397

Phone: (714) 730-5397

Design and Implementation of Sub-Slab Depressurization System(SSDS) in Pasadena, California

Design and Implementation of Sub-Slab Depressurization System(SSDS) in Pasadena, California

Background of the Sub-slab Depressurization System (SSDS)

  • Site History
    • 1961: Metalcraft products manufacturing
    • 1971: A warehouse were expanded
    • 1980’s/1990’s refinishing/enameling company-operated perchloroethylene (PCE) degreaser, baking oven, paint and solvent spray booth, and unspecified “other” solvent degreaser
    • 23,000 square foot building footprint 
    • Heterogeneous sub-slab poured at different times over the life of the building
    • PCE is the Chemical of Concern (COC)
    • Soil vapor and indoor air sampling results above the allowable limits

Design and Implementation of Sub-Slab Depressurization System(SSDS) in Pasadena, California                Design and Implementation of Sub-Slab Depressurization System(SSDS) in Pasadena, California               Design and Implementation of Sub-Slab Depressurization System(SSDS) in Pasadena, California

Pre-Work for the Subslab Depressurization System (SSDS)

  • Cracks were sealed by others
  • A pilot test was conducted

Construction of the Subslab Depressurization System (SSDS)

  • 3 extraction points
  • 9 observation points
  • Blower w/carbon

Start-Up, Acceptance, and Operation of the Subslab Depressurization System (SSDS)

  • Started up and adjusted the system to achieve full slab coverage
  • Compiled start-up report and included Operations and Maintenance (O&M) Manua

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