*The aggregate resource at the DuPont site is from a glacial deposit called Vashon Advanced Outwash. These deposits are abundant in the Puget Sound lowland areas and run from Bellingham to South of Olympia.
* In order to be used for concrete rather than fill, aggregates are required by WSDOT and other building code regulations to meet very strict grain size specifications, and are also required to be washed to remove silt and other deleterious materials.
* Glacier/CalPortland's own internal analysis of the grade of aggregate material found at the site documents that the sand and gravel cannot be used in concrete production and is only suitable for use as the most basic fill material.
* In recent years, the head geologist at the Washington State Department of Natural Resources specifically noted that the type of resource at DuPont was not in short supply.
No comments:
Post a Comment