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natural microbea and increases the rate of natural biodegradation <br /> erroleum <br /> (which is generally on-going at any site having p <br /> hydrocarbons in soil). The microbes can be further stimulated by <br /> adding fertilizer. <br /> Treatment cells allow for better control of soil moisture, temperature,Because <br /> and nutrient and oxygen content than landfarming. <br /> treatment cells are fully enclosed, commercial (non-native) nt cells <br /> cies <br /> can be used to accelerate the biodegradation process. Treatment <br /> are expensive to construct and offer no significant benefits for <br /> compounds such as petroleum hydrocarbons that are simple to <br /> biodegrade. Therefore treatment cells were eliminated from further <br /> consideration. <br /> Composting can be a very effective bioremediation method. It lbws <br /> for faster and more controlled treatment than landfarming, <br /> but is <br /> less costly than treatment cells. An effective, innovative composting <br /> technology using a product marketed by X-19 Biological Products has <br /> been identified. X-19 is a microbiological humic polymer that can <br /> degrade hydrocarbons in soils to any specified cleanup level. The <br /> technology involves mixing the affected soils wits X-18 in a 3:1 ratio <br /> by volume. A 4-foot thick layer of the X-19/soil mixture is placed on a <br /> visqueen liner, moistened with water, covered with additional <br /> visqueen, and allowed to stand for approximately 90 days. During <br /> this period only minimal monitc Ug (soil moisture and temperature <br /> measurements) of the pile is required. After treatment, the soil <br /> would be backfilled into the excavated area. <br /> X-19 is an effective method for treating hydrocarbon-containing soils. <br /> Because of the clayey nature of the soils at the site, more mixing may <br /> be required to expedite the biodegradation process. This alternative is <br /> mplev a ted using only con eo <br /> n8 <br /> $ 0 per cubic yard) <br /> ind could be <br /> 50 nal construction equipment. easily <br /> mp <br /> �heirrieal Neut <br /> Chemical neutralization involves treating the soils to neutralize the <br /> compounds present. Neutralization is only used for soils affected by <br /> acidic or alkaline conditions, rather than hydrocarbons. This <br /> treatment is not effective for hydrocarbons. Therefore neutralization <br /> has been eliminated as a potential soil treatment alternative. <br /> ? This alternative involves the excavation of the hydrocarbon- <br /> containing soils at the site and subsequent incineration at an off-site <br /> facility. After incineration <br /> appropriate landfill. The excavated areawould <br /> led or <br /> disposed of at an uld be <br /> Fry <br /> i <br /> 1 <br />