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imA <br /> F VfROFMENFAL <br /> July 12, 2006 <br /> Dan Wynne <br /> Shaw Environmental &Infrastructure <br /> 1326 N Market Blvd <br /> Sacramento, CA 95834 <br /> iRE: Report of Findings,Dort Rodgers Project <br /> IDear Dan <br /> PRIMA Environmental recently conducted tests on soil from the Don Rodgers site to <br /> estimate the longevity of modified Fenton's reagent in the subsurface and to measure the <br /> concentrations of several metals The results are presented in this letter report <br /> Eleven(11) soil samples were received on March 31, 2006 Per your email of May 23, <br /> 2006, sample DP-6-40 5 was tested for metals, while sample DP-8-47 5 was tested to <br /> estimate the longevity of Fenton's reagent in the sub-surface No tests were performed <br /> on the remaining samples <br /> PROCEDURES <br /> Metals Analysis. Sample DP-6-40 5 was submitted to Alpha Analytical (Sparks, NV) <br /> for analysis of CAM-17 Metals (Be, V, Cr, Co,Ni, Cu, Zn, As, Se, Mo, Ag, Cd, Sb, Ba, <br /> Hg, Tl, and Pb) via EPA Method 6020 <br /> Longevity of Modified Fenton's Reagent The longevity of modified Fenton's reagent <br /> (a mixture of hydrogen peroxide—H2O2—and ferrous iron citrate) was estimated by <br /> measuring the rate of H2O2 decomposition over time Three flasks containing 40 g DP-8- <br /> 47 5 soil and modified Fenton's reagent were prepared as shown in Table 1 Deiomzed <br /> water was added as needed to bring the total added aqueous volume to 20 mL Each flask <br />' was then connected to an inverted cylinder filled with water As the H2O2 decomposed, it <br /> formed oxygen gas, which displaced the water in the container The rate of off-gas <br /> formation is approximately equal to the rate of H2O2 decomposition The volume of off- <br /> gas generated was recorded as a function of time <br /> 10265 Old Placerville Road,Suite 15,Sacramento,CA 95827-3012*Ph(916)363-8798•Fax(916)363-8829 <br /> www primaeovironmental com <br />