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Toyon Canyon Landfill

Vegetation on finished slopes of Toyon Landfill

FACT SHEET

Address: 5050 Mount Hollywood Drive Los Angeles 90027 (Griffith Park) 
Year Opened: 1957
Year Closed: 1985
Property Size: 4,218 acres (Griffith Park)
Fill Area: 90 acres
Type of Refuse: Class III (residential, street sweepings, construction and demolition materials)
Total in Place Capacity: 16,000,000 tons or 30,720,000 cubic yards
Average Depth of Fill: 290 feet
Additional Expansion Area: None

Toyon Canyon Landfill closure work was completed in December 2008. The landfill gas management system consists of vertical extraction wells, collection pipping, and a flare. From 1985 to 2015 a power plant was operated at the site. The plant began producing 9MW of electrical power in 1985 and during its 30 years of operation the production gradually declined to 1.4 MW as the landfill gas flow decreased. It was finally shutdown in 2015 because there was not enough gas to operate the system. A new contractor is being sought to operate a new system at lower gas flow.

 

 

STATUS OF CLOSURE CONSTRUCTION

Closure activities for Toyon Canyon Landfill were completed as of December 2008 with a monolithic cover system in accordance with the Final Closure/Post-Closure Maintenance Plan (FCPCMP).

 

In keeping with the Los Angeles Regional Water Quality Control Board's (LARWQCB) conditional approval of the FCPCMP , two moisture monitoring stations were constructed in November and December of 2008 and operated from December 2008 through December 2010 to ensure that the final cover system prevents infiltration of moisture into the waste mass.

 

Work currently being done at the site involves post-closure tasks such as maintenance of landscaping/irrigation systems, maintenance of landfill gas collection systems, and minor grading work where necessary to maintain adequate stormwater drainage.

 

The Construction Completion Report  documents closure construction work completed by LA Sanitation as specified in the Construction Quality Assurance Plan of the FCPCMP.

POTENTIAL FUTURE USE

Public use facilities, such as a low intensity open meadow area intended for passive recreational activities.

Closure Construction

Before Closure Construction Image 1
Before Closure Construction Image 1

Push-pull hauling off a stockpile of soil

Before Closure Construction Image 2
Before Closure Construction Image 2

Dirt being pushed by dozers to put finish grade on slopes

Before Closure Construction Image 3
Before Closure Construction Image 3

Scraper dumping dirt on benches to fill and slopes to grade

Before Closure Construction Image 4
Before Closure Construction Image 4

Dozer pushing dirt up slope after scraper just spread out its load

Before Closure Construction Image 5
Before Closure Construction Image 5

Dozer trimming slope to finish grade

Before Closure Construction Image 6
Before Closure Construction Image 6

Dozer walking on slope, and water truck watering slope

Before Closure Construction Image 7
Before Closure Construction Image 7

Completed slopes and benches with grindings on benches for access to header lines and gas wells during the winter season

After Closure Completion

Finished grade with vegetation
Finished grade with vegetation

Finished grade with vegetation

Slopes with hydroseeding
Slopes with hydroseeding

Slopes with hydroseeding

Finished slopes with surrounding area
Finished slopes with surrounding area

Finished slopes with surrounding area

Slopes with vegetation
Slopes with vegetation

Slopes with vegetation

Debris basin collecting rain and sediment from top deck
Debris basin collecting rain and sediment from top deck

Debris basin collecting rain and sediment from top deck

Slope with gas collection system
Slope with gas collection system

Slope with gas collection system

Top deck area of landfill
Top deck area of landfill

Top deck area of landfill

Methane gas being collected to the flare area
Methane gas being collected to the flare area

Methane gas being collected to the flare area

Permeability station on top deck
Permeability station on top deck

Permeability station on top deck

Finished slope of Toyon Canyon
Finished slope of Toyon Canyon

Finished slope of Toyon Canyon

Flare station at Toyon Canyon
Flare station at Toyon Canyon

Flare station at Toyon Canyon