The main Camp Adair dump — Coffin Butte

The most important location was Coffin Butte, just west/northwest of the main cantonment. Army waste disposal at the Coffin Butte site began around 1942. The Army used an area on the southwest/southern slope of Coffin Butte as an open-burn dump. Trash was hauled there, piled up, and burned. 

Camp Adair apparently operated three incinerators during the war at a site near the intersection of Camp Adair Road and NW Independence Highway. A 1952 newspaper account specifically identified the three wartime incinerators. 

Interestingly, this is the beginning of what eventually became the Coffin Butte Landfill. The WWII Army dump eventually continued to be used after Camp Adair closed and developed into the modern landfill. 

So there wasn't necessarily one single place where everything went.

Food waste was handled differently

The Army was also trying to recover and sell usable materials. A 1944 report by Major Tony Frank of the Camp Adair salvage department says food waste that couldn't be prevented was turned over to a contractor, who paid the Army for the garbage and fed it to hogs. Other materials including metal, fats, paper, rubber, cotton and wool were salvaged and sold.