Active quarry operations use a variety of equipment and techniques to dislodge, secure, and transport large quantities of rock and soil. Quarry locations vary from soft, wet, river bed, sand deposits to hard rock, drill and shoot, granite cliff faces, etc. Quarry operations in San Diego County typically involve heavy duty earth moving equipment consisting of front end loaders, bulldozers, scrapers, and transport vehicles. Many sites blast the rock deposits regularly and include large open material storage areas for processed material. Quarries may or may not be located next to rock and sand processing plants. Substantial haul road distances and traffic is not uncommon.