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i <br />4.3 Identify the Chemical Composition of the Gas Plant Residues <br />This objective will be accomplished by performing specified laboratory <br />analyses on selected soil samples collected from the proposed thirty-one <br />soil borings, and water samples taken from the four proposed and six <br />existing monitoring wells at the Tracy site. Table 2 shows the numbers of <br />soil and groundwater samples that will be analyzed for each selected <br />parameter. <br />IThe following tasks are proposed to complete this objective: <br />BTEX may be found in soils at manufactured gas plant sites as a fraction of <br />the oil used as the raw material and as a result of the breakdown of PNA <br />compounds over time. BTEX analyses will also be performed on all of the <br />selected soil samples. <br />Results of the 1987 PG&E site investigation suggest that an underground <br />gasoline tank formerly located in the northwest corner of the Tracy site may <br />I3542a/BAV102 18 <br />4.3.1 Analyze the chemical composition of soil samples collected from <br />31 soil borings <br />Soil samples selected by the process identified in Section 4.2.1 will be <br />analyzed for some or all of the following chemical parameters shown in <br />Table 2: polynuclear aromatic hydrocarbons (EPA Method 8310); benzene, <br />ethylbenzene, toluene and xylenes (BTEX)(EPA Methods 8015/8020); California <br />Code of Regulations Title 22 (CAM) metals (EPA Method 6010); phenols (EPA <br />Method 8040); sulfides (Standard Method 426A); and cyanides (EPA Method <br />9010). These chemical constituents have been selected because of their <br />historical association with gas manufacturing. <br />Lampblack, coal tar and oil tar are the most common wastes associated with <br />' <br />gas manufacturing. These viscous or charcoal -like materials may contain <br />high concentrations of polynuclear aromatic hydrocarbons (PNAs). Of the 62 <br />known PNA compounds, 12 are considered carcinogenic (Pucknat 1981). FNA <br />analyses for these 12 compounds will be performed on all of the selected <br />soil samples. <br />BTEX may be found in soils at manufactured gas plant sites as a fraction of <br />the oil used as the raw material and as a result of the breakdown of PNA <br />compounds over time. BTEX analyses will also be performed on all of the <br />selected soil samples. <br />Results of the 1987 PG&E site investigation suggest that an underground <br />gasoline tank formerly located in the northwest corner of the Tracy site may <br />I3542a/BAV102 18 <br />