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1f , • y BIO NATIONAL CORPORATION 5 SYSTEM CONTROL The Bio National On Site Bioremediation System has built in time and flow control factors that assure safety and simplicity of operation. The prime element is the natural microbial process itself. 5.1 NATURE'S CONTROL OF ITS OWN SYSTEM 5.1.1 Naturally occurring microbes that will improve the quality of the treatment system are further enhanced by a reasonable and simple control system. 5.1.2 The microbes and nutrients applied to the contamination can only thrive with a carbon and nutrient source, in a range of temperature and pH that assures controllability. 5.1.3 Microbes will attack the lighter ends of any contamination first, thereby minimizing the possibility of air pollution. 5.1.4 Once the microbes find their food sources exhausted, they die. 5.1 5 Elevated temperatures and the introduction of microbially toxic materials to the plume will halt the biological activity. 5.1 6 Bioremediation falls into three currently available methodologies for this purpose, 1) Enhancement of indigenous organisms with NPK and oxygen enrichment. 2) Introduction of a single known effective organism to enhance the indigenous. 3) Introduction of a pre--tested menu of pre-selected, compatible, non-pathogenic organisms, with NPK and oxygen enrichment into a zone of contamination that is known to be digestible by one or a combination of organisms, together, of in stages. Bio National recognizes the limitations of 1) and 2), and utiliv-s what it feels is the most environmentally effective and time conserving approach. The process is designed to meter in only the ainount of inoculum, water, microbes and enhancers, to wet the zone, not saturate it. Further, the process is NOT soil venting, and it is NOT soil flushing 6 THOR901