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i <br /> ATTACHMENT TO THE SOIL REMEDIATION PLAN <br /> CONWAY PROPERTY <br /> 381 WEST TADDEI ROAD, ACAMPO, CALIFORNIA <br /> "BIODEGRADATION OF EYDROCARBON CONTAMINATED SOIL" <br /> 1. INTRODUCTION <br /> The degradation of several hydrocarbon products by bacteria is a <br /> well documented process, which has been successfully used on <br /> hydrocarbon contaminated soils at more than 250 sites nationally. <br /> Due to the potential for air pollution caused by volatile organic <br /> compounds (VOC) , the increasing cost of soil disposal and the <br /> closure of more and more landfill facilities, on-site remediation <br /> has become one of the most cost-effective alternatives for soil <br /> remediation. <br /> 2 . BIOLOGICAL DEGRADATION OF HYDROCARBONS <br />. Our enhanced bioremediation process is aerobic. By utilizing the <br /> carbon present in the hydrocarbons as their sole source of food, <br /> the aerobic bacteria generate by-products, which are simple and <br /> non-hazardous, such as water, carbon dioxide and biomass. Due to <br /> the aerobic nature of the process, no odoriferous by-products are <br /> emitted during or after treatment. <br /> The microorganisms are selected not only for their ability to <br /> metabolize and assimilate hydrocarbons but also for their ability <br /> to survive and grow under wide pH and temperature variations. <br /> Numerous strains of bacteria (gram positive rods) , proven to be <br /> "eager" hydrocarbon degraders, i.e. using hydrocarbons as their <br /> sole source of carbon, have been successfully isolated and <br /> cultured. The microbiological procedures are performed under the <br /> supervision of our consulting senior microbiologist, Mr. James <br /> Hoeltgen. <br /> 3 . PREPARATION PROCEDURES <br /> Treatment cells are constructed prior to excavation. The treatment <br /> cells consist of polyethylene liner in either bermed or depressed <br /> areas to prevent any run-off. During the excavation process, <br /> nutrients consisting of nitrogen and phosphorus as ammonium <br /> phosphate are added to the soil. The soil is transferred into the <br /> treatment cells and piled between two and three feet high. <br /> i <br /> 4 <br />