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