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Table 3 Arco Service Station No.5469 130 Wilson Way Stockton, California Monitoring Plan Summary Sampling Sampling Parameter Frequency Parameter Significance Locations Field Parameters pH Monthly Complete oxidation of petroleum hydrocarbons results in formation of carbon dioxide and water, MW-1, MW-4 through which may result in formation of bicarbonates MW-10 resulting in high pH. Dissolved Oxygen Monthly Half life period of ozone is approximately 20 minutes (DO) after which it degrades to oxygen. A rise in DO MW-1, MW-4 through levels in comparison to baseline data will be an MW-10 indicator of effective operation of ozone injection system. Laboratory Parameters Chemical Oxygen Quarterly COD is the amount of oxygen required to Demand(COD) degrade organic compounds in groundwater. COD MW-1, MW-4 through concentrations are anticipated to decrease with MW-10 decrease in petroleum hydrocarbon concentrations. Ferrous Iron Quarterly Oxygen,a by-product of ozone degradation can react with dissolved iron in groundwater to form ferric MW-1, MW-4 through oxide,an soluble precipitate. MW-10 Total Dissolved Annually TDS is a measure of dissolved inorganic constituents Solids(TDS) and small amounts of organic matter. Precipitation MW-1, MW-4 through of inorganic constituents in groundwater due to MW-10 ozone injection can result in scaling. Heterotrophic Plate Counts Quarterly Oxygen,a decay product of ozone can be utilized M1/V_1, MW-4 through by indigenous microorganisms for biodegradation of MW-10 petroleum hydrocarbon constituents. Nitrates,sulfates& Annually petroleum hydrocarbons. Nitrates, nitrites,sulfates MW_1, MW-4 through phosphates and phosphates are nutrients required for MW-10 microbial growth and reproduction. Total Organic Carbon Annually TOC is a measure of total concentration of organic (TOC) carbon that may be available for biodegradation. Carbon MW-1, MW-4 through from the petroleum hydrocarbons is the primary energy MW-10 source for microbes. Petroleum Hydrocarbons Quarterly Chemicals of concern. Baseline and operational &Oxygenates concentration levels will be compared in evaluating MW_1 through MW-10 Performance of ozone injection system.