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r • pH by EPA Method 150.1, Conductivity by EPA Method 120.1,natural oxidation demand as chemical oxygen demand(COD)by EPA Method 410.4; and For water only: oxygen reduction potential(ORP)by SM 2580B,alkalinity by EPA Method 310.1, and total dissolved solids (TDS)by EPA Method 160.1. f In addition, during purging of the wells for ground water sample collection, purge water will be 4 measured for pH, conductivity, temperature, dissolve oxygen (DO), and oxidation-reduction potential(ORP). Laboratory reports;for soil and ground water analysis,testing methods,laboratory quality assurance/quality control(QA/QC)reports,and sample chain of custody documentation will be presented in a report with findings and recommendations. Bench Scale Study The bench scale study will consist of assessing soil and ground water samples collected from the 15 to 35 foot saturated zone.For the bench scale study,a minimum of 2,000 grams(4.4 pounds)of soil and 2,500 milliliters (ml) or 0.66 gallons of the ground water will be required for each evaluation. However,the analytical laboratory recommends that each set of soil samples consist of four 2-inch by 6-inch brass sleeves; and each ground water sample consist of 6-liters. The Bench Scale Study will be conducted by the laboratory.for a total of five days. An ozone generator will be utilized to produce gaseous ozone into an equal weight of soil and water residing in a laboratory cleaned, sealable and controllable beaker for beinch scale treatment. Ozone-enriched air will be continually delivered into the matrix mixture ata rate not to exceed 100 milliliters per minute. The ozone will be delivered by teflon tubing or chemical resistant tubing. An aliquot of 20 ml of water will be collected on a daily basis for analysis of hexavalent chromium,-ozone, and pH. Additional water QA/QC spike will be included in the Bench Scale Study; in conjunction with blanks and analysis QA/QC. On the termination of the Bench Scale Study, the remaining water will be fully re-analyzed a final time to determine the concentration increases of Cr" and to measure the concentrations of the additional analytes (i.e., metals and general parameters) outlined above. The Bench Scale Study water will be held for one week, in order to analyze the chemical data and determine if additional analysis will be required to assess whether a return to a steady state of concentration has been achieved for concentrations of metals which are responsible for water quality degradation.