CCZO -- Soil Texture -- Calhoun CZO -- (2015-2016)

These are soil texture data (% sand/silt/clay) for samples collected May-July 2015 and December 2016 in References Areas 1, 4, and 7 during the installation of gas wells. Samples were obtained by coring to depths of 500 cm with a bucket auger. From 50-500 cm, sampling occurred at fixed intervals: 50-100, 100-150, 150-200, 200-250, 250-300, 300-350, 350-400, 400-450, and 450-500 cm. In the upper 50 cm, samples were taken at the following depths: 0-7.5 cm, 7.5-15 cm, 15-30 cm, and 30-50 cm. Extracted soil was mixed on a tarp and sub-sampled in the field. Individual samples were uniquely identified by Reference Area, Gas Well Number, and Depth. Samples were transported to Duke in plastic bags where they were opened and allowed to air-dry for a minimum of 2 weeks. After air-drying, samples were passed multiple times through a #10 sieve (2-mm mesh) to separate soil from > 2-mm fraction. Obtaining pre-sieve bulk soil mass, and post-sieve >2-mm mass, allowed >2-mm mass fraction to be estimated. The < 2-mm fraction was transferred to paper bags for oven-drying at 40C for 48-72 hours. Texture was measured on the oven-dry sample using a standard method based on gravitational sedimentation. The lab SOP is available upon request.