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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 FTguency Parameter Significance Locations <br /> Field Parameters <br /> pH Bi-Monthly Complete oxidation of petroleum hydrocarbons MW-1 through MW-10 <br /> results in formation of carbondioxide and water, <br /> which may result in formation of bicarbonates <br /> resulting in high pH <br /> Dissolved Oxygen Bi-Monthly Half life period of ozone is approximately 20 minutes MW-1 through MW-10 <br /> (DO) after which it degrades to oxygen. A rise in DO <br /> levels in comparison to baseline data will be an <br /> indicator of effective operation of ozone injection <br /> system <br /> Specific Conductivity Bi-Monthly SC is a measure of dissolved constituents.Any MW-1 through MW-10 <br /> (SC) significant increase in SC levels in comparison to <br /> baseline data will warrant to evaluate precipitations <br /> in the well <br /> Laboratory Parameters <br /> Chemical Oxygen Quarterly COD is the amount of oxygen required to MW-1 through MW-10 <br /> Demand(COD) degrade organic compounds in groundwater. COD <br /> concentrations are anticipated to decrease with <br /> decrease in petroleum hydrocarbon concentrations <br /> Oxidation Reduction Quarterly ORP of groundwater is the measure of electron activity MW-1 through MW-10 <br /> Potential(ORP) and is an indicator of the relative tendency of the <br /> system to lose or gain electrons. Generally, ORP <br /> greater than 500 my is considered as an oxidizing <br /> environment <br /> i <br /> Ferrous Iron Quarterly Oxygen, a by-product of ozone degradation can react MW-1 through MW-10 <br /> with dissolved iron in groundwater to form ferric <br /> oxide,an soluble precipitate. <br /> Total Dissolved Quarterly TDS is a measure of dissolved inorganic constituents MW-1 through MW-10 <br /> Solids(TDS) and small amounts of organic matter. Precipitation <br /> of inorganic constituents in groundwater due to <br /> ozone injection can result in scaling. <br /> Bioparameters Quarterly DO from ozone degradation can be utilized by MW-1 through MW-10 <br /> (Plate Counts, nitrates, indigenous microorganisms for biodegradation of <br /> nitrite,sulfates, & petroleum hydrocarbons. Nitrates, nitrites,sulfates <br /> phosphates) and phosphates are nutrients required for <br /> microbial growth and reproduction. <br /> Petroleum Hydrocarbons Quarterly Chemicals of concern. Baseline and operational MW-1 through MW-10 <br /> & Oxygenates concentration levels will be compared in evaluating <br /> performance of ozone injection system <br />