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0 SECOINTERNATIONALINCORPORATED <br /> SE C O R www.secor.com <br /> ' Sample will be treated with ozone for 4.5 hours at 0.20 lbs of ozone per day at a rate <br /> Of 5 scfh ora proximately 2.5 Ipm. <br /> Hydrogen pe oxide will be added in three aliquots over the duration of the <br /> ' experiment at a dosing level based on the soil oxidant demand. <br /> The air and ozone spargi d samples will be treated with the same air source with separate flow <br /> regulators to ensure accu ate measurement of the gas flow. <br /> ' Treatment: <br /> ' Soil and groundwater sarr pies will be treated with 30 times the predicted stoichiometric dose of <br /> ozone (samples will be analyzed after a set sparge time which is representative of the <br /> appropriate <br /> 21 ozoneg generator dr whit Ozone <br /> the capacity toerated and generate 0.20rpodundsng a per daylfic(3.7O5zone model <br /> grams per <br /> hour) of ozone using a breathing air feed (20% oxygen). <br /> Treatment Procedure: <br /> ' Ozone, Ozone and Hydrcgen Peroxide, and Persulfate Treatments <br /> Each 1000 mL Erlenmeygr flask for the ozone treatments will be plumbed to the ozone <br /> generator with a sealed ce p and an inlet and outlet tube. The inlet will be attached to a glass <br /> tube inserted to the bottom of the flask. The tube will be placed at the bottom of the flask and <br /> ' ozone was passed through the soil and water up through the head space of the container and <br /> out the outlet tube. A syringe will be used to add hydrogen peroxide to the peroxide treated <br /> samples. The outlet tube will be attached to a large sealed bag to collect off-gasses. The air <br /> ' sparged sample will be sparged with clean air using the air supply for the ozone sparging unit. <br /> The gas will serve to agitat the samples during treatment. <br /> The initial gas sample will be taken after three headspace volumes of gas have purged the <br /> container (after 5 minutes). After 4.5 hours, a second gas sample will be taken as the final gas <br /> sample concentration. The removal rate in gas samples will be calculated by comparing the <br /> change in,gas sample concentrations and the initial gas sample concentration. Initial soil and <br /> ' groundwater constituent concentrations will be measured in the untreated sample. <br /> Final soil and groundwater onstituent concentrations for the air sparged, ozone sparged, and <br /> ' ozone sparged with hydrogen peroxide samples will also be measured after 4.5 hours. The <br /> removal rate for air sparging, ozone only, and ozone and hydrogen peroxide sparging tests in <br /> soil and groundwater will be calculated by comparing the change in each matrix and the initial <br /> ' concentration in each matrix. <br /> Post treatment metals concentrations will be measured in filtered groundwater at the end of the <br /> treatment by EPA method Wo. Chromate will not be measured by EPA method 7196A if the <br /> total chromium concentrate n is below 50 pg/L the maximum contaminant limit (MCL). <br /> Groundwater will be analyzed for TPHg, BTEX, MTBE, TBA and acetone by EPA method 8260 <br /> by STL Laboratory in Pleasanton, California. Air samples will be taken in Tedlar bags and <br /> analyzed by EPA method 82,30 by Air Toxics of Sacramento, California. <br /> ' 3 <br />