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2018 – 8th Annual ‘Odor’ Workshop - Summary

The Western Placer Waste Management Authority (WPWMA) held its 8th Annual Odor Workshop at its Fiddyment Road facility, hosted by Environmental Engineering Program Manager Eric Oddo and Environmental Resources Specialist Stephanie Ulmer.  Eric gave an overview of the program, from its beginnings in the 1970s through the Joint Powers Authority formed (Rocklin/Roseville/Lincoln), and various expansions of the Materials Recovery and Compost additions since 1995.  The increase of expansions has resulted in a reduction of landfill area; capacity to handle current growth is until 2058 at this point; but could be reduced to 2038 with continued growth scenarios.


Odor discussions cover the following topics:

  • Various sources of odors from WPWMA—3% active landfill; 0.1% MRF, 28% inactive landfill (gas sources); and 68% compost (20 acres).
  • Various sources of odors generated by surrounding areas—ranching areas, wood manufacturing, etc.
  • Efforts, both positive and not so successful, to help contain odors, including: ‘scents’ that didn’t have much success, electronic ‘noses’ that have helped track odor sources, an online reporting program to help identify when residents detect odors (helps finds odor trends); use of special liners to protect leakage, an ongoing compost pilot project, and biofilters that have reduced 90% of the compost odors recently.   
  • Challenges facing WPWMA’s future—state-mandated regulations, growing population to double by 2050.  By 2025, everyone will be required to collect/recycle organic materials. Current efforts mix food and green waste with compost materials—4 to 1—and use the biofilters to reduce odors. 
  • Challenges to the recycling market—China was the biggest purchaser, but China is now doing their own recycling; WPWMA needs to find new markets.

Efforts to increase the efficiency of the WPWMA were mentioned:

  • Reaching out to partner with new technologies and enhance compatibility with core tenants to increase recycling efficiency.  Recycling has helped divert 40% of disposal materials—50% of materials received are not going into the landfill now. 
  • Current sales contract to provide methane gas to will end in 2020; need to find new markets.
  • Discussions during breakout sessions indicated Placer Ranch/Sunset expansion will reduce the ‘one-mile buffer zone’ to 300 feet, generating a ‘cost share’ for increased costs of ‘odor’ containment.  This stated cost share is what our City leaders and residents were concerned with previously during presentations of the Placer Ranch/Sunset project).    


Report odors or get further info at WPWMA.com.

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The Purpose of RCONA

·         To raise the level of community participation by citizens for improving and maintaining the quality of life within the City of Roseville.

·         To work with neighborhood associations in resolving social, physical and economic problems within a neighborhood, and deal with other important neighborhood issues.

·         To facilitate communications within and between neighborhoods.

·         To provide instruction and support to neighborhood association leader.

·         To pursue funds from all sources for use in the community and neighborhoods.

·         Revitalize inactive neighborhoods.

·         Organize the residents, property owners, organizations and businesses within each area into a neighborhood association.

·         Bring all neighborhoods together in a coalition of associations.

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