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JAN-16—'91 WED 12:Ei9 I ;AX TES_HNIDLOGIE'er TEL NO-438 7� � #499 P15 --.- <br /> Soil Excavation and Disposal <br /> Hydrocarbon impacted soil will be excavated and removed from the site. <br /> The excavated soil will be transported to a licensed Class I landfill for <br /> disposal . Approximately 2,000 cubic yards of soil would be excavated and <br /> removed to effect remediation of the site. <br /> Active Soil Bioremediation <br /> Active biological remediation of the gasoline hydrocarbons will be <br /> achieved through enhancement of the soil microbial population. Microbial <br /> population will be enhanced through the addition of nutrients and oxygen. <br /> Water will be injected into the soil to provide oxygen for the microbes <br /> and to introduce any nutrients that may be limiting the rate of microbial <br /> activity. <br /> Rate of bioremediation of gasoline impacted soil is site-specific, <br /> depending on a variety of factors such as indigenous microbe population, <br /> sail fertility, and other physio-chemical characteristics of the soil . <br /> EVAX will conduct an initial study to evaluate the fertility status of <br /> the soil and determine the microbial respiration rate expected under <br /> existing conditions. The findings of the study will enable EVAX to draw <br /> conclusions and make recommendations regarding the factors limiting the <br /> activity of the indigenous microbe population. <br /> Baseline soil parameters, including hydrocarbon concentration, fertility <br /> level of the soil , and respiration rate of the indigenous microbes, will <br /> be determined during the initial evaluation of site conditions. The same <br /> parameters will be evaluated again after b weeks. The overall <br /> degradation rate of the gasoline fuels can be determined from these <br /> measurements. At this point, a recommendation will be made regarding the <br /> next course of action to bioremediate the remaining gasoline fuels <br /> present in the soil . An estimate of the length of time required for <br /> remediation of the remaining gasoline can be made. <br /> Following each system monitoring, reports that include the results of the <br /> monitoring and any modifications made to the system, such as <br /> fertilization, are prepared. <br /> RISK ASSESSMENT <br /> Site <br /> The greatest risk associated with the site, with the entire project, is <br /> the continued threat to groundwater if a remediation project is not <br /> initiated. Hydrocarbon vapors were detected to a depth of 34 feet below <br /> 12 - <br />