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but no iron were sampled later than tests containing iron. Reagents were added to soil and groundwater in a glass reactor. Each reactor was connected to a Tedlar bag in order to collect off=gases. After 24-48 hours, the aqueous and gases phases were analyzed for GRO. Treated soil was not analyzed due to the difficulty of sampling soil without losing significant contaminants to volatilization. Table 1 . Reaction Conditions for GRO Removal Tests. Initial Test Number Soil: Gquid H2Initial Initial Sample Time O2 Ratio 2 pH Fe*, mg/L Hrs. 1 (Control, 1 : 5 0 Ambient Ambient 24 Tests 2-5 113 (Control, 1 : 5 0 Ambient Ambient 48 Tests 6-9 2 1 .5 2 Ambient Ambient 24 3 1 : 5 5 Ambient Ambient 24 4 1 : 5 2 2-3 Ambient 24 5 1 : 5 5 2-3 Ambient 24 6 1 :5 2 2-3 250* 48 7 1 :5 5 2-3 250* 48 8 1 :5 2 Ambient 250* * 48 9 1 : 5 5 Ambient 250* * 48 * Iron added as iron sulfate heptahydrate. **Iron added as GrowMoterm agricultural chelated iron. 2.4 Rate Off-gas Formation/112O2 Decomposition The rate of off-gas formation, which is a first approximation of the longevity of 112O2, was measured for each oxidant system (Table 1 ). Soil, groundwater, and reagents were placed in a glass reactor fitted with a single hole-stopper and connected to an inverted container filled with water. The soil to liquid ratio was 2 : 1 . As H2O2 decomposed, the off-gases formed displaced the water in the cylinder. The amount of water displaced was recorded as a function of time. This information can be used to estimate the longevity of H202in the field. 2.5 Effect of Oxidants on Secondary Water Quality To assess the affect of each oxidant system on secondary water quality, the aqueous phases from the COC Removal tests (Section 2 .4) were analyzed for - Cr(VI), Iron, manganese + CAM 17 metals ORP, pH sulfate PRIMA Environmental, Inc. 8 Eva] of Peroxide February 8, 2007 Cambria—G Street, Davis