Description: This layer shows our interpretations of materials testing reports that were available at the time of analysis for each project area. Rock samples from test sites were analyzed at materials testing labs for strength and durability. The Los Angeles (LA) Abrasion and the Washington (WA) Degradation tests are two common methods that the aggregate industry uses to assess if an aggregate material will perform as needed for many aggregate products. For this study, the aggregate quality threshold requires a LA Abrasion test result of <30 percent and WA Degradation test result of >30 percent, as specified in the WSDOT standards for hot-mix asphalt. Testing results may be Pass, Incomplete Pass, Incomplete Fail, Partial Fail, or Fail depending on the results from these two tests. Sample material that breaks down too much during these tests result in a Fail or Partial Fail test result, while more durable material result in a Pass test result.
Description: This layer represents surface mining point locations used at the time of analysis for each publication’s project area. These features were sourced from WGS’s Surface Mine Reclamation Program’s (SMRP) database, historical U. S. Geological Survey (USGS) topographic maps, lidar, aerial imagery, and other available sources.
Description: The polygons in this layer represent the aggregate resource inventory. Demonstrated, Inferred, and Speculative classifications indicate where aggregate resources may be found, while the Not a Resource classification indicates where aggregate resources may not be found. In general, our data is intended to be used at no finer a scale than 1:24,000.