Specifications For Processed Green Material


Processed Green Material (PGM) consists of yard wood wastes that are dried, crushed, shredded, and sorted. These yard wastes should not contain grass clippings or leaves, which compost quickly and can cause odor violations. The California Code of Regulations, Title 27, Division 2, Subdivision 1, Chapter 3, Subchapter 4, Section 20690 (b) (3) defines PGM as follows:

(3) Processed Green Material (PGM)

(A) Processed green material shall be green material as defined in Title 14, California Code of Regulations, section 17852(u) with the exclusion of manure. Processed green material may include varying proportions of wood waste from urban and other sources and shall be ground, chipped, shredded, screened or otherwise processed in a manner to provide a compacted material free of open voids when applied to meet the performance requirements as alternative daily cover.

Contaminant Debris

The PGM should be free of all contaminant debris (glass, paper, plastic, etc.) as well as salt and deleterious materials such as clods, coarse objects, and rocks.


The particle size of the PGM used at the landfill is between ½-inch and 3 inches in length and not less than ½-inch in width and 1/8-inch in thickness. At least 85 percent of the PGM, by volume, shall conform to the sizes specified. No particle should exceed 5 inches in any dimension.

Moisture Content

The moisture content of the PGM should not exceed 25 percent.

Note: Moisture content assumed to be defined on the geotechnical basis of mass (weight) of water divided by weight of solids.