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I <br /> PRIMA Environmental dwynne/2 <br /> 16 July 12,2006 <br /> Table 1 Initial Conditions for LongevityTests <br /> Test Soil Initial 142O2 % Initial Fe m /L* <br /> 1% H2O2 40 1 250 <br /> 3% H2O2 40 3 250 <br /> 10% H2O2 40 10 250 <br /> IWadded as ferrous iron citrate <br /> RESULTS AND DISCUSSION <br /> Metals Analysis The results of the CAM-17 metals analysis are shown in Table 2 The <br /> complete analytical report is attached <br /> Table 2 Metals Analysis by EPA 6020 for Soil DP-6-40 5. <br /> Analyte Units Result <br /> Beryllium mg/4 < 1 <br /> Vanadium --.mq/kq 46 <br /> Chromium mg/kg 33 <br /> Cobalt mq/kq m /k89 <br /> Nickel mg/kq mg/k26 <br /> Copper mq/kq m /k21 <br /> Zinc mg/kg 46 <br /> Arsenic 43 <br /> Selenium mg/kg < 1 <br /> Molybdenum mgfkg 15 <br /> Silver mg/kq mg/k < 1 <br /> Cadmium mg/kq mg/k < 1 <br /> Antimony mIke < 1 <br /> Barium mglkg 200 <br /> Mercury mg/kmg/kq 02 <br /> Thailium m /kg < 1 <br /> Lead mg/kg -5 1 <br /> Longevity of Modified Fenton's Reagent The results of the test to assess the <br /> longevity of modified Fenton's reagent in the presence of soil are shown in Figure 1 For <br /> each test, the volume of off-gases generated within 24 hours was similar to the volume <br /> expected given the amount of H2O2 added (see Table 3) The rate of reaction increased <br /> 1 with increasing H2O2 concentration when 1% H2O2 was used, 90% of the off-gases were <br /> generated in 6 6 hours, but when 10% H2O2 was used 90% of the off-gases were <br /> generated in 3 5 hours These results suggest that infection of a lower concentration of <br /> H2O2 may be more effective than a higher concentration because the lower concentration <br /> will last longer and the volume of oxygen generated will be less likely to have any <br /> adverse effects <br />