The ground under Irwindale is just one giant sand wash :lol: Being so close to the mountains that sand is also occupied by some rather large chunks of aggregate that just rolled with the flow :lol: They have numerous neighbors that specialize in the processing of such material for their use in concrete and asphalt products. I attended the "Last Blast" at the previous Irwindale in the late 70s. Many racers that evening expressed their displeasure with "MILLER BEER SUCKS!" added to their race car graphics :rofl: Few years later their sits a Miller brewery.