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WebSand and gravel refers to loose rock and mineral materials. Sand grains range in size from 0.075 mm to <4.75 mm, and gravel ranges in size from 4.75 mm to <75 mm. Sand and gravel deposits commonly contain minerals and rocks that are resistant to weathering, like quartz, quartzite, and chert. WebAggregate resources are mapped, and continue to be mapped, at a countywide scale at 1:50,000 for sand and gravel resources and at 1:100,000 for crushed stone resources. Therefore, this viewer is set to display data at a countywide level, and not at a site-specific level to view single parcels of land. Technical Requirements WebAggregates are sand, stone, and gravel materials that are used to form compound materials through a binding operation. On-site testing facilities and state-certified staff ensure the reliability of the aggregate product. State-certified material from our numerous locations creates reliable sand, gravel, and stone aggregate products at a fair price. impact builders llc