Colfax Infiltration and Inflow Mitigation – Colfax, CA

This project helped the City of Colfax reduce wastewater collection system infiltration & inflow (I&I) to comply with the provisions of Cease and Desist Order (CDO) No. R5-2010-0001, issued by the Central Valley Regional Water Quality Control Board in January 2010.

H&K provided materials testing and special inspection of 10,182 linear feet of the collection system and approximately 100 manholes rehabilitated as part of the project. Our typical scope of services included:

  • Periodic field moisture/density testing during the backfilling operations associated with the installation of new piping for the wastewater collection system.
  • Periodic field moisture/density testing during the backfilling operations associated with the removal and replacement of sewer manholes.
  • Laboratory testing to support the materials testing being performed in the field.
  • Preparation and distribution of field and laboratory reports, presenting the results of testing performed.