Particulate matter released from these activities is most accurately quantified using quarry emission factors from the mineral product facilities. Screening equipment is usually owned and operated by sub-contractors. Like sand screens, the rock crushing equipment is typically owned and operated by sub-contractors. Typical vehicle traffic at active landfills which must be included in haul road emission estimates are solid waste transport vehicles, green waste transport vehicles, and cover material transport vehicles. These operations typically consist of segregating the green waste at the collection point and transporting the material to a designated area of the disposal site.
Earth moving equipment is used to stockpile the green waste and feed the grinding equipment.
The resulting mulch is either used for cover material or transported off-site. Particulate emissions from the composting and recycling activities are generated primarily from the earth moving equipment and are similar to those observed at open material storage piles. Default concentration values for trace metals in this dust are from mineral product facility test results obtained throughout San Diego County. The compaction of solid waste and application of daily cover material at active landfills results in particulate matter emissions. Active landfills typically receive solid waste at the working face of the disposal site and compact the trash with large bulldozers.