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• SIEQR INTERNATIONAL INCORPORATED <br /> w ..secorcom <br /> SECOR <br /> SECOR will analyze soil and groundwater from the ozone treated samples to determine <br /> what effect ozone will have on the leachability of the trace elements listed above. If trace <br /> elements are not observed in soil prior to treatment, they will be removed from the <br /> subsequent analysis list. <br /> 3) Provide results of general minerals analyses of the groundwater. Results from this analysis <br /> should be used to evaluate if naturally occurring minerals will precipitate out of the <br /> groundwater as a result of the ozone injection. The following general mineral suite should <br /> be evaluated: aluminum, antimony, arsenic, barium, beryllium, cadmium, calcium, chromium <br /> (III and VI), cobalt, copper, iron, lead, magnesium, manganese, mercury, molybdenum, <br /> nickel, potassium, selenium, silver, sodium, thallium, tungsten, vanadium, and zinc. <br /> SECOR will analyze groundwater prior to treatment and in the ozone treated samples to <br /> determine what effect ozone will have on the leachability of the trace elements listed above. <br /> If trace elements are not observed in soil prior to treatment, they will be removed from the <br /> subsequent analysis list. Metals influenced by ozone that will undergo precipitation are <br /> arsenic, chromium, iron and manganese which are typically solubilized by either microbial <br /> reduction (arsenic, iron and manganese) or chemical oxidation (chromium) in TPH impacted <br /> soils. <br /> 4) Provide an estimate of the mass of other constituents/parameters, including Electrical <br /> Conductivity, chlorides, sulfides, etc. which will be released into the aquifer as a result of the <br /> ozone injection, and the rationale for the estimate. <br /> SECOR will present proposed chemical reactions for elements in soil which will be <br /> solubilized by chemical oxidation and may contribute to TDS. Those constituents will <br /> include sulfides predominantly, which are generated by the reducing conditions of the <br /> aquifer where the TPH was released. Because ozone treatment does not include <br /> introduction of other TDS species, it is not anticipated that the treatment will significantly <br /> impact these parameters above levels already observed in groundwater upgradient of the <br /> impacted area. Therefore, SECOR will not analyze for these constituents, only provide <br /> estimates of how they might be impacted using chemical equations. <br /> 5) Provide an estimate of the mass of TDS that will be mobilized by the injection of the ozone, <br /> and the rationale for the estimate. <br /> Ozone sparging does not require addition of TDS species, and potential solubilization due to <br /> chemical oxidation is anticipated to be insignificant. Therefore, SECOR does not anticipate <br /> a change and will only provide an estimate of the changes. <br /> 6) Provide estimates of changes in pH in groundwater and the radius of influence for the <br /> proposed ozone injection. <br /> SECOR has never observed significant changes in pH due to ozone sparging due to the fact <br /> that ozone sparging only generates minimal concentrations of acid species and the carbon <br /> dioxide generated by the oxidation is rapidly stripped from groundwater by additional <br /> sparging. Because pH is not impacted by ozone sparging, pH will only be monitored in <br /> groundwater after treatment. <br /> 2 <br />