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PRIMA Environmental, Inc. cherxns/5 of 7 <br /> Confidential December 9,2007 <br /> Secor—Circle K rip <br /> Two sets of tests will be conducted. The first set will comprise four replicates containing <br /> treated water and untreated site soil; these represent conditions downgradient of the <br /> treatment zone. The second set will consist of four replicates containing treated water <br /> and treated soil;these represent conditions within the treatment zone, once ozonation has <br /> ceased. Periodically, one replicate from each set will be sacrificed and the aqueous phase <br /> analyzed for Cr(VI). <br /> Task 6. Natural Attenuation of Bromate—optional <br /> If bromate is formed during treatment with ozone, additional tests can be conducted to <br /> assess whether these parameters can naturally attenuate. PRIMA will consult SECOR <br /> before conducting these tests. <br /> Treated soil and treated groundwater will be prepared by repeating the high dose test(s)in <br /> Task 3 to obtain sufficient treated material. Soil and groundwater from the original Task <br /> 3 test(s)and the repeated test(s)may be combined. The concentration of bromate in the <br /> composited water will be analyzed for bromate. <br /> Two sets of tests will be conducted. The first set will comprise four replicates containing <br /> treated water and untreated site soil; these represent conditions downgradient of the <br /> treatment zone. The second set will consist of four replicates containing treated water <br /> and treated soil;these represent conditions within the treatment zone, once ozonation has <br /> ceased. Periodically, one replicate from each set will be sacrificed and the aqueous phase <br /> analyzed for bromate using a 5 day TAT. <br /> Task 7. Report Preparation <br /> A reportwill be prepared that contains a complete description of the procedures used, <br /> observations, results, and evaluation of the data <br /> ANALYTICAL METHODS <br /> The method for each analysis and the laboratory to perform the analysis are given in <br /> Table 3. <br /> SAMPLE REQUIREMENTS <br /> - 10 x 1 L(amber glass)of site groundwater, chilled, but otherwise unpreserved <br /> - 5 kg of IMPACTED site soil (7-8 2"diameter by 6"sleeves or equivalent). If <br /> soil contains many large(> 1/4")rocks, additional sample is needed since the <br /> large pieces will be removed prior to testing. <br /> - 2 kg clean, downgradient soil recommended for attenuation tests. <br />