Greenwaste collected from Los Angeles residents are dumped at Lopez Canyon
The on-site workers come near the dumped greenwaste
Then, they begin to disperse the yard trimming
Unfortunately, yard trimmings are not the only things that end up in the green bin
Workers need to remove the contaminants from the greenwaste
Sometimes, large amounts of contamination are found inside the greenwaste
After the large contaminants are removed from the piles, the skip loaders appraoch
These skip loaders help to lift large amounts of yard trimmings and deposit them into the trammel
From there the greenwaste is carried on conveyor belts and are mechanically sorted
The larger particles continue on their journey on the conveyor belt
Further sorting is conducted, whereby the contamination is manually removed
Once the remaining contaminants are removed, it is sent to the grinder
The end results becomes mulch, which is then mixed with finer particles previously sorted out
The mulch is then stacked into windows
The windrows of mulch are then aerated
The mulch is then loaded up on trucks
These trucks later deliver the mulch to any of our 11 mulch giveaway sites
The delivered mulch is then evened out for easy pick up by residents of Los Angeles
Information for locals about Lopez Canyon found at the Community page.
For more information about our Free Mulch Give-Away Program, click here.
In 2002 it became clear to LA Sanitation (LASAN) managers that the three small scale green trimmings management sites operated by City staff were not enough to accommodate City needs.
A task force of Lopez Canyon Landfill neighbors (individuals, neighborhood associations, local non-profits) was formed to meet with LASAN representatives to determine the feasibility of siting a composting facility at the closed landfill and to advise LASAN on how this proposed facility would impact the community. Meetings were held for nine months discussing topics that included:
As a result of these meetings LASAN did the following:
A Mitigated Negative Declaration was prepared and approved, a Memorandum of Understanding was written and signed by the Task Force and the facility became a reality in December 2003.
Over the years changes have been incorporated into the facility, sometimes based on requests by the community, sometimes based on needs identified by LASAN. These changes have included:
Lopez Canyon Environmental and Education Center is now the processing site for curb-side collected yard trimmings from the East Valley area as well as horse manure collected by the City into valuable mulch and compost.
The Lopez Canyon Environmental and Education Center located at the closed Lopez Canyon Landfill is currently:
Since 2004, yard trimmings collected from residents in the San Fernando Valley have been processed at this City of Los Angeles owned and operated composting facility. Today an average of 300 tons per day (tpd) of yard trimmings are mixed with about 125 tpd of woody materials to produce high quality mulch that is given away free to City of Los Angeles residents, delivered to farmers and donated to schools, non-profits, and community groups. Another specialized product consists of horse manure and yard trimmings compost. This horse manure compost is an STA certified product.
LA Sanitation strives to provide the highest quality compost and adhere to standards adopted by the compost industry.
Learn more about the Seal of Testing Assurance for our Green Giveaway, horse manure compost and Griffith Park compost here.
Copies of the most current quarterly program STA data sheets for horse manure compost can be obtained here.
Copies of the most current bi-monthly program STA data sheets for Green Giveaway can be obtained here.
Producing a high quality product (either mulch or compost) involves removing contamination (anything besides organic material) from the raw materials, making piles of the cleaned material, keeping it moist, mixing it and letting it sit and decompose. The finished product looks dark and rich, like the rich soil you see under trees in the woods.
The process begins when City workers remove large contaminants by hand. The cleaned material is then loaded into a trommel screen where it’s separated by size into coarse and fine material (less than 2 inches in size). The coarse material is transported by conveyor belt to a picking station where workers again remove non-organic materials. The cleaned material is now fed into a grinder where it’s reduced in size to about 2 inches or less. This product is mixed with the other fine material that came from the trommel screen and laid out in piles (windrows) on the asphalt pad.
Water is added and the windrow is mixed using a compost turner. Some of the cleaned, fine, material is mixed with horse manure and placed in separate windrows. Each windrow is approximately 20 feet wide, 8 feet high, and 300 feet long. Once placed into windrows, the material is periodically turned, monitored for proper temperature and moisture for approximately 30 days for mulch and 60 days for horse manure compost.
Odor control is performed at the site by maintaining porosity in the compost piles by addition wood chips that serve as a bulking agent, piles are turned frequently and never when the wind direction is toward a residential area, odor neutralizer is atomized and used on the grounds, and proper house keeping and management practices are performed.
As we are committed to constant and never-ending improvements in every aspect of our work, in order to further minimize noise and odors generated from the operation of the compost facility, we expanded the existing earth berm and installed an odor control system around the facility facing the community.
Operating Hours: Monday through Friday, 8:00am-4:30pm