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1 0 t <br />BTEX are sometimes found in groundwater at manufactured gas plant sites. <br />They are extremely mobile in soil because of their small molecular size and <br />weight, and can move readily from soil into groundwater. As mentioned in <br />Section 4.3.1, elevated concentrations of BTEX associated with a former <br />onsite underground gasoline storage tank may be encountered during this <br />' investigation. This will be considered when evaluating BTEX results from <br />monitoring wells located in the northern portion of the site. <br />1 Phenols, cyanides, and sulfides are water soluble and also have low <br />molecular weights. If any of these compounds are components of gas plant <br />residues, they can leach from soils into groundwater. <br />Metal oxides can dissociate in water and easily move from soils into <br />groundwater. Metal analyses will be used to identify elevated metal <br />concentrations in the groundwater that may be a result of manufactured gas <br />plant processes. <br />1] <br />3542a/BAV102 22 <br />General minerals analysis provides an indication of the general groundwater <br />quality and aids in the interpretation of geochemical processes. Two <br />groundwater samples will be analyzed for general minerals, one from the <br />upgradient well located at the southern edge, and one from the most <br />downgradient well at the northeastern edge of the Tracy site. The general <br />mineral analysis includes the quantification of bicarbonate, carbonate, <br />hydroxide alkalinity, calcium, copper, foaming agents, nitrate, iron, <br />magnesium, manganese, pH, potassium, sodium, sulfate, specific conductance, <br />total dissolved solids, total hardness, and zinc. <br />4.3.3 Analyze the chemical composition of the drill cuttings and waste <br />water generated during this investigation <br />Drill cuttings from the soil borings will be stored onsite in soil bins <br />until completion of the field work proposed for this investigation. Prior <br />to disposal, a composite sample will be collected and analyzed by the <br />laboratory for PNAs, BTEX, metals, cyanides, and sulfides. This analysis <br />will be used to determine the proper classification of the waste soil. <br />1] <br />3542a/BAV102 22 <br />