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PRIMA Environn;,,'.,tal, Inc. eprice/4 of 6 <br /> ` September 27,2007 <br /> Proposal-Eval of RegenOx <br /> Task 4. Natural Attenuation of CC(VI) and/or bromate—If needed <br /> If Cr(VI) or bromate, is formed at concentrations of concern in Task 3, then testing will <br /> be conducted to determine whether these compounds can naturally attenuate in the <br /> treatment zone and downgradient of the treatment zone. Tests to evaluate both scenarios <br /> are proposed because RegenOx is non-selective, which might make soil within the <br /> treatment zone less able to attenuate compounds than soil immediately downgradient of <br /> the treatment zone. Note that for these tests, Cr(H)will be analyzed by PRIMA <br /> Environmental using a Hach DR 2800 Spectrophotometer and appropriate Hach <br /> reagents. <br /> Attenuation tests will simulate the treatment zone and downgradient of the treatment <br /> zone. The downgradient zone tests will comprise four replicates containing treated water, <br /> untreated site soil. The treatment zone tests will consist of five replicates containing <br /> treated water and treated soil. Periodically, one replicate from each set will be sacrificed <br /> and the aqueous phase analyzed for Cr(VI) and/or bromate. The typical sampling <br /> schedule is 3 days, 7 days, 14 days, and 28 days, but may be adjusted as needed depending <br /> upon the 3 and 7 day results. If bromate is evaluated, bromate analyses will be expedited <br /> in order to determine appropriate sampling times. <br /> Task 5. Report Preparation <br /> A report will be prepared that contains a complete description of the procedures used, <br /> observations, results, and evaluation of the data. <br /> ANALYTICAL PROCEDURES <br /> The analytical methods to be used and the laboratory performing each analysis are <br /> summarized in Table 2. <br /> Table 2. Summary of Analytical Methods <br /> Analyte Method Laboratory Performing Test* <br /> GRO,DRO, VOCs, oxys, EPA 8260/8015 Alpha Analytical <br /> EDB, acetone <br /> Bromate EPA 317 BSK <br /> Bromide EPA 300 BSK <br /> Cr EPA 7199 or Hach** Excelchem or PRIMA <br /> DO Probe PRIMA <br /> Metals CAM-17+Fe EPA 6020 Alpha Analytical <br /> ORP Probe PRDAA <br /> H Probe PRIMA <br /> Residual H2O2 Test stri s pRUv1A <br /> *Alpha Analytical(Sparks,NV);BSK Analytical (Fresno,CA);Excelchem(Rocklin CA); <br /> ** Hach DR 2800 Spectrophotometer and appropriate test reagents <br />