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1 <br /> clay soil using aerobic organisms and low tech "soil farming" is about 6 IN to 8 IN <br /> ' Dependent upon the volume excavated and the limited spreading area, a deeper pile <br /> with a smaller foot print may be used with progressive top layers removed as they <br /> ' become acceptable for return to the excavation Multiple layers of remediation activity will <br /> extend the time line of the process <br /> Contamination levels based Con earlier borings are expected to range between <br /> ' 200 to 15,000 ppm of diesel in isolated pockets� and less than 200 ppm of gasoline <br /> Excavated soil is not expected to average in excess of 3,000 ppm of diesel It must be <br /> ' noted that the gasoline fraction of solvents found at this site should not be confused <br /> with possibly leaded gasoline often found in remediation of fuel storage areas There is <br /> no expected lead contamination <br /> ' 32 Soil Remediation <br /> Soil remediation alternatives considered include <br /> 1 Sod Washing <br /> 2 Bio-remediation <br /> 3 Thermal Hydrocarbon Separation <br /> 4 Offsite land disposal in a Class II or Class III land fill <br /> ' 3.21 Soil washing is not proposed for this site's contaminated material Non-granular <br /> nature of sod matnx and small quantity anticipated does not favor soil washing Expected <br /> ' production remediation costs exceeding $2001ton might be anticipated <br /> ' 3.22 Bio-remediation is anticipated utilizing itinerant bacteria found on the site <br /> Nitrogen and phosphate nutrients will be added in measured quantities to amend the <br /> ' process ess Moisture will be supplied from the onsite well without runoff from the site <br /> ' 3-3 <br />