Size a manure storage for a wintering facility in Klamath Falls. The rancher houses 500 beef cows from November 1 until calving starts the first day of March. The facility is open lot with 350 square feet of total lot per cow. All of the lots slope to a single storage. He feeds along a fence (pipe and cable) where cattle stand in a concrete alley 10 by 650 feet. All of the manure in the alley is scraped once per week to storage.

1a. What is the volume contributed from the alley?