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Engineering Properties—Weld County,Colorado, Northern Part Koskie Pit 2020 Amendment <br /> American Society for Testing and Materials (ASTM). 2005. Standard <br /> classification of soils for engineering purposes. ASTM Standard D2487-00. <br /> USDA Natural Resources Web Soil Survey 3/24/2020 <br /> Conservation Service National Cooperative Soil Survey Page 3 of 6 <br />