An intumescent polymer composition includes a matrix polymer, an acid catalyst source, a nitrogen source and an ionic phyllosilicate synergist having substantial cationic exchange capacity. It is comprised of a pre-tank which captures trash and allows anaerobic microorganisms to begin breaking down the sewage, an aerobic tank where aerobic microorganisms digest the sewage, and a post-tank which acts as a gravity separating clarifier in which solid particulate contaminants settle downward, leaving a clean effluent for discharge to the environment. The method includes with an application thread writing to the update buffer and, when filled, attempting to write the pointer for the update buffer to the global array. The estimated timing represents that the valve opening parameter is estimated to be switched from a first value to a second value in response to the input timing of the switching request. The method can be used to identify a projected path for the drill bit, import data, compute wellbore profiles and stratigraphic cross sections, plot actual drilling paths, overlay the actual drilling path onto the projected path, and present control buttons to the user. The end surface grinding wheel grinds the end surface of the work while the outer diameter surface grinding wheel grinds the outer diameter surface of the work in a state that the work is disposed between the outer diameter surface grinding wheel and the regulating wheel.