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11 17 Lone Palm Avenue, Suite 201 Modesto, California 95351 i V 209-579-2221 Fax: 209-579-2225 The initial sparge test conducted using the shallow and deep AS points of SP- 1 will simulate the injection parameters of a typical ozone sparge system. Ambient air will be injected via a compressor at a pressure of 15 to 30 psi at a flow of approximately 2 to 3 efm . This "inicro-sparge" approach will provide information to evaluate the effectiveness of an ozone sparge system (low airflow and low pressure) . The subsequent sparge pilot tests will be conducted at approximately 5 and 10 efm for the two sparge points of SP- I to assess the effectiveness and feasibility of using air sparge (higher pressure and greater airflow) as a remedial method to remediate the dissolved phase site contaminants. i During each AS test, SVE will be conducted concurrently utilizing the VE wells installed for the pilot test program . The operation of the SVE equipment will be used to capture volatile organic compound vapors (fugitive emissions) produced during the operation of the air sparge system. Secondarily, the SVE implementation will be used to evaluate the effectiveness of the air sparging in conjunction with the SVE, described above. A soil g_ assample will be collected at the end (at a minimum) of both air sparging pilot tests in a Summa canister for laboratory analyses of TPHg using EPA Method TO-3 , and BTEX and select fuel oxygenates using EPA Method TO- 15. Z Baseline Sampling and Monitoring , Prior to start of the pilot tests, baseline measurements of wellhead pressure, static water level, vapor- phase fuel hydrocarbon concentrations, dissolved-phase fuel hydrocarbon concentrations, pH, temperature, DO, and oxidation-reduction potential (ORP) will be collected . Magnehelic gauges and pressure transducers (zeroed at ambient pressure) will be installed at select Wells. The pressure transducers will be used to monitor the groundwater levels in selected wells during pilot testing. Baseline VOC concentrations in vapor will be measured at each monitoring well using a PID . Baseline pH, dissolved oxygen, and ORP values will be measured using down4iole probes. As deemed appropriate, other parameters may be monitored using down-hole probe devices. I a OZONE BENCH SCALE TESTING Ozone bench scale testing will be conducted in the event that ozone sparge is selected as a feasible technology for site remediation. If ozone sparging is selected, the following bench scale process will be conducted. l i Background Ozone (03) gas is a strong oxidant that can destroy a wide range of organic compounds, potentially converting them to carbon dioxide and water. Dissolved iron and other metal ions in soil and groundwater can increase the effectiveness of ozone by reacting with ozone to form hydroxyl radicals. The hydroxyl radical is an even stronger oxidant than ozone and may react more quickly and produce fewer intermediates than ozone itself. Equations 1 -6, below, show the reactions for conversion of BTEX compounds and select fuel oxygenates to carbon dioxide (CO2) and water (H2O). The stoichiometric ozone requirements for the complete mineralization of each contaminant are provide in the following table . Chemical reactions cannot be written for GRO known also as TPHg (and stoichiometric requirements cannot be pre-determined) because GRO is a complex mixture of chemicals. In practice, a Workplan for Feasibility studies — Former Stockton Tali Company ATC Associates hie. S:...\28349\ WP ror Pilot Testing mid SChl ATC Project No. 54.28349.0001 8