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ORC TECHNICAL BULLETIN # V.8 Oxygen Release Compound,ORC® M Study with Dow Chemical on Soil Remediation Applications (Biopiles) REGENESIS conducted a biopile study with Dow Chemical which compared ORC, a time release`form of magnesium peroxide, to Permeox, a commercial form of calcium peroxide. Soil piles were constructed with a TPH level of 1000 - 2000 ppm Levels of .25% and .5% ORC were tnaled .38% Permeox had the equivalent oxygen to 5% ORC The use of higher levels of Permeox, such as a 2X application of 76%, were deemed to be potentially toxic due to pH effects. The Table below presents the data after two weeks !2omparative Study in Bioptle Remediation between ORC and Permeox and Projections made from the DerivedRate taut Remediation Time to 100 ppm TPH From Treatment % Reduction Rate Constant 1000 ppm 2500 ppm 5000 ppm • Control 12 00935 25 weeks 34 weeks 42 weeks 38 % Ca02 54 03669 6 weeks 9 weeks 11 weeks 25% M902 69 05885 4 weeks 5 weeks 7 weeks 5% M902 74 06735 3 weeks 4 weeks 6 weeks The treatment cells consisted of 5 cu yds. of soil and straw with a fertilizer mixture Data was taken after two weeks It should be noted that the study also included a 2.5 cu yd. tilled control which responded essentially the same as the untilled control (9% vs. 12% reduction) The conclusion of the study was that the ORC was more efficient on both a lower and an equal oxygen basis, compared to Permeox. while Permeox has about 30% more oxygen on a weight basis, it is not used as efficiently because, without intercalation, it is released about ten times faster than ORC. It also has a tendency to "lock-up"as calcium hydroxide by-products seal off the surface of the Permeox particles. This is not as severe a problem with magnesium hydroxide and the "lock-up" effect is disrupted by the patented intercalation process that provides longevity to ORC particles