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<br /> Prior to CA Regional Board staff approval of a Pilot Study Work Plan, a bench-scale
<br /> laboratory study(study)will be required to evaluate the effects of injecting ozone into the
<br /> aquifer, specifically identifying all anticipated interactions, including valence changes for
<br /> metallic ions (i.e., oxidizing naturally occurring Cr3+to toxic Cr6). The study must also
<br /> include:
<br /> 1) Stoichiometry or chemical equations with concentrations in moles for the reaction
<br /> between the soil and groundwater and the injected ozone.
<br /> 2) Provide results of a leachability testing of native soils,to determine the potential effects
<br /> from the ozone injection. General minerals analyses should be conducted to evaluate if
<br /> naturally occurring minerals will move into solution as a result of the ozone injection.
<br /> The following general mineral suite should be evaluated: aluminum, antimony, arsenic,
<br /> barium,beryllium,cadmium,calcium, chromium(III and IV),cobalt,copper, iron,lead,
<br /> magnesium, manganese, mercury, molybdenum, nickel, potassium, selenium, silver,
<br /> sodium,thallium,tungsten, vanadium, and zinc.
<br /> 3) Provide results of general minerals analyses of the groundwater. Results from this
<br /> analysis should be used to evaluate if naturally occurring minerals will precipitate out of
<br /> the groundwater as a result of the ozone injection. The following general mineral suite
<br /> should be evaluated: aluminum, antimony, arsenic,barium,beryllium,cadmium,calcium,
<br /> chromium(III and IV), cobalt,copper,iron, lead, magnesium,manganese, mercury,
<br /> molybdenum, nickel,potassium, selenium, silver, sodium,thallium,tungsten, vanadium,
<br /> and zinc.
<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
<br /> the ozone injection, and the rationale for the estimate.
<br /> 5) Provide an estimate of the mass of total dissolved solids that will be mobilized by the
<br /> injection of the ozone, and the rationale for the estimate.
<br /> 6) Provide estimates of changes in pH in groundwater and the radius of influence for the
<br /> proposed ozone injection.
<br /> 7) Provide an assessments of the site specific effectiveness of ozone sparging for
<br /> eliminating identified soil and groundwater contamination in this case, and
<br /> identify/demonstrate that any breakdown products of this process (i.e. acetone and/or
<br /> other degradation products) are analyzed for and addressed by the planned remediation.
<br /> If the study indicates that the proposed ozone injection will remediate the hydrocarbons/fuel
<br /> additives and will not adversely affect water quality, we can determine the applicability of waste
<br /> discharge and appropriate filing fees.
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