Methods for removing, reducing or treating the trace metal contaminants and the smaller fine sized cerium oxide particles from cerium oxide particles, cerium oxide slurry or chemical mechanical polishing compositions for Shallow Trench Isolation process are applied. The log carriage is slidably mounted on the frame member for movement from a log loading position adjacent a proximal end of the frame member to an extended position adjacent to a distal end of the frame member. In a system having a hierarchically-organized memory component, a small number of the free pointers are maintained at a relatively higher performance level of the memory and the balance of the free pointers are maintained at a relatively lower performance level of the memory.