. 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 /> •
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