When the material reaches the processing plant at Martin Marietta Materials' New Harvey Sand near Des Moines, Iowa, the rock drops into a log washer that breaks up the clay balls and takes out the mud. Then, it goes to a vibrating screen that divides it into three different sizes - 2-inch septic gravel, 3/4-inch gravel, and pea gravel - which are stockpiled for sale.
Негізгі бет Rock passes through a log washer at New Harvey Sand
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