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. System Operation Details <br /> The C-SpargeTM system was started on December 26, 2002 The C-SpargJm control panel was <br /> programmed and scheduled to inject ozone cyclically into each injection point for 14 minutes Based on <br /> this programming, each injection point will have ozone injection in 18 cycles for 4 2 hours every day <br /> During fourth quarter 2003 (between October 6, 2003 and December 22, 2003), a Stratus technician <br /> conducted six site visits to collect field parameters and laboratory parameters The ozone injection <br /> system was observed as non-operational on November 10, 2003, due to an electrical switch malfunction <br /> The system was re-started on November 10, 2003, after troubleshooting the electrical problem Field data <br /> sheets presenting field parameters collected between October 6, 2003 and December 22, 2003 are <br /> included in Appendix A, and certified analytical reports with chain-of-custody documentation are included <br /> in Appendix C <br /> Ozone Infection Monitoring Pian <br /> Monitoring wells MW-3 through MW-10 are used as observation wells to monitor the performance of the <br /> ozone injection system Monitoring wells MW-1 and MW-2 are used as background wells to evaluate and <br /> monitor for natural geo-chemical changes in the groundwater The following field and laboratory <br /> parameters were monitored periodically to evaluate and optimize the performance of the ozone injection <br /> system <br /> Field Parameters pH, Dissolved Oxygen (DO), and Specific Conductivity <br /> Laboratory Parameters TPHG, BTEX, five oxygenates, Chemical Oxygen Demand (COD), Ferrous Iron, <br /> Total Iron, Total Organic Carbon (TOC), Nitrates, Sulfates, Phosphates, and Total Dissolved Solids <br /> During fourth quarter 2003, field parameters were collected on a bi-monthly basis and laboratory <br /> parameters were collected on a quarterly basis During the fourth quarter 2003 monitoring event, all <br /> samples were collected after purging three volumes of well casing <br /> Evaluation of field data (DO, pH, and specific conductivity), collected on a bi-monthly basis and laboratory <br /> analytical data (COD, TOC, ferrous iron, total iron, plate count, nitrates, sulfates, phosphates, and total <br /> dissolved solids), collected quarterly, do not appear to present a pattern or correlation between various <br /> parameters, for chemical oxidation of petroleum hydrocarbons, bio-chemical reactions, or biodegradation <br /> The pnmary parameters that are used to evaluate the performance of ozone injection system are the <br /> changes in petroleum hydrocarbon and dissolved oxygen concentrations Therefore, Stratus proposes to <br /> modify the monitoring frequency for bio-parameters (nitrates, phosphates, sulfates and TOC) and TDS, <br /> from quarterly to annually, and this data will be used to identify any drastic geo-chemical changes, bio- <br /> fouling, chemical precipitation, etc, that may occur due to ozone injection The modified ozone injection <br /> monitoring plan is listed below and a summary of frequency and significance of field and laboratory <br /> parameters is presented in Table 3 <br /> Field Parameters (Monthly) pH, Dissolved Oxygen(DO), and Specific Conductivity <br /> Laboratory Parameters (Quarterly) TPHG, BTEX, five oxygenates, Chemical Oxygen Demand (COD), <br /> Ferrous Iron, Total Iron, and heterotrophic plate count <br /> Laboratory Parameters (Annually) Total Organic Carbon (TOC), Nitrates, Sulfates, Phosphates, and Total <br /> Dissolved Solids <br /> Table 3 presents the revised sampling frequency, field and laboratory parameters analyzed, and <br /> significance of both laboratory & field parameters <br /> • <br /> P\BP-Arco for URS\5469\Quarterly\2003\Arco_5469_4Q03 doc 5TRATU5 <br />