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NW Washington | Your local dirt moving contractors should know of a local source or maybe the county road folks. The geotextile is usually put under any base material between the soil the base rock. It is there to keep the rocks from going down and the soil from coming up. There are various grades and types available. Google "geotextile" or words to that affect.
http://www.usfabricsinc.com/products/geotextilewelcome.shtml?ex=eep...
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geotextile fabric?
