Fig. 3. X-ray diffraction patterns of oriented, Mg 25°C-treated clay fractions of biosolid H₂O₂ residues. The patterns are compared to soil clay from the MERCO site from Casby-Horton (1997): (a) June 1999; (b) July 1994; (c) August 1992; (d) Pit 4, A-horizon clay.