The Hoover Dam was built on top of the unpredictable Colorado River in the middle of the 19 hundreds. When I test the water for contamination after the water has went through the engines that purify the water. After I check the water, I go and check on the other workers and when I go in the engine room. I have to put on ear muffs because the engines make a lot of sound that came heart the ear drum. When I am don checking on the workers, I go to my office and wright down the data from the water samples and test them. When people drive on top of the Hoover Dam, I never see anyone pollute at all and the river is always clean.
