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Mission Canyon Landfill, Unit 2 (Canyon 4-7): In-Depth Information

CIWMB’s Solid Waste Information System (SWIS) number: 19-AA-0822
Site Information per Landfill Facility Compliance Study (Task 2)
Closed before 1993

Information Source: Owner/Operator—American Golf
Telephone Conversation, March 31, 2004

The owner indicated that the site was closed in 1978 by placing a 15- to 20-foot soil cap over the waste.

The owner indicated that the site has not been required to conduct a corrective action program (CAP) or been issued a cleanup and abatement order (CAO) for groundwater-related issues. The owner installed a series of surface water drainage structures that virtually eliminate surface water onflow to the landfill. The site has not received an area of concern (AOC) for either landfill gas (LFG)-related issues or surface water-related issues from the EA.

The air quality management district (AQMD) issued an AOC during an inspection for surface emissions. The owner installed a series of additional LFG collection wells and the surface emissions have been mitigated.

Information Source: Los Angeles Regional Water Quality Control Board
Telephone conversations: March 26, 2004 and April 16, 2004

The regional water quality control board (RWQCB) indicated that the site has not been required to conduct a CAP or CAO relative to groundwater issues since January 1, 2002. The waste discharge requirements (WDR) were rescinded in 1992 and as such, groundwater monitoring is no longer required at the site. The RWQCB indicated that the WDRs were rescinded because groundwater quality monitoring indicated that there were no perceived potential impacts and groundwater chemistry was consistent over time. In other words, the constituents detected in groundwater, if any, were consistently detected at low concentrations.

Information Source: Enforcement Agency—City of Los Angeles, Environmental Affairs Department
E-mail response: April 7, 2004

The enforcement agency (EA) indicated that the landfill has received four AOCs for LFG-related issues since January 2002. The EA indicated that the owner mitigated the violations by adjusting LFG well pressures, repairing collection headers, and installing a new LFG well.

The EA indicated that the owner received a violation report on March 22, 2000, for drainage and erosion control, grading, and slope stability. The EA indicated that the landfill operator promptly regraded the area.

Information Source: South Coast Air Quality Management District
Telephone conversation: March 31, 2004
E-mail response: May 21, 2004

The air quality management district (AQMD) indicated that the LFG collection system for the site includes interior collection wells, perimeter collection/control wells, and an LFG flare. The LFG is typically collected and conveyed to the University of California, Los Angeles, where it is converted to reusable energy. The AQMD indicated that the site shares its LFG collection system with Mission Canyon Landfill, Unit 3. The AQMD indicated that the owner was issued a notice to comply (NTC) to maintain the LFG flare station in good operating condition after a rainstorm caused a mudflow to the LFG flare station. The AQMD indicated that the NTC was mitigated by regrading the area around the LFG flare station and improving surface water controls.

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Last updated: November 08, 2007


Landfill Facility Compliance Study http://www.ciwmb.ca.gov/Landfills/ComplyStudy/
Bobbie Garcia: bgarcia@ciwmb.ca.gov (916) 341-6291