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Landfill Regulatory Compliance

Project Highlights
  • Research historical site disposal practices
  • Determine historical landfill boundaries
  • Determine site hydrogeologic characteristics
  • Establish groundwater monitoring network that meets the requirements of California Code of Regulations, Title 23, Division 3, Land Disposal
  • Interpret soil and groundwater data relative to hazardous waste leakage
  • Establish landfill monitoring and groundwater monitoring program

EEC Environmental (EEC) was retained by a landfill owner to perform a Solid Waste Assessment Test (SWAT) at the site located within a former rock quarry overlooking the Pacific Ocean and has been in operation since the early 1940’s. The Sanitary Landfill is the principal landfill. The purpose of the SWAT is to evaluate if evidence of leakage of hazardous waste exists beneath the landfill. This was accomplished through the analysis of surface and groundwater on, under, and within one mile of the site that provided a reliable indication of the leakage of hazardous waste.

The SWAT was prepared in accordance with the requirements of Section 13273 of the California Water Code. The completed assessment described the results of quarterly and periodic sampling events conducted since the approval of the SWAT proposal in the early 1990’s. The conclusions from the SWAT report were utilized to develop a sampling and monitoring plan for the site. The sampling and monitoring plan was approved by the California Regional Water Quality Control Board (CRWQCB) and consists of collecting groundwater samples on a yearly basis from one downgradient groundwater monitoring well.