Laserfiche WebLink
0 <br />L <br />i <br />n <br />I� <br />0 <br />n <br />0 <br />0 <br />6.3 Site History <br />PG&E's Tracy service center is the site of a former manufactured gas plant <br />that operated between 1928 and 1930. The gas plant was a small facility <br />consisting of one gas holder, generators, scrubbers, and purifying tanks. <br />The facility used the Beals process to manufacture illuminating gas from <br />oil. In 1930, PG&E purchased the Tracy gas plant. The plant was shut down <br />in July 1930, after the arrival of natural gas service to the area. <br />Previous investigations conducted at the site showed elevated levels of <br />benzene, toluene, ethylbenzene and xylenes (BTEX) in the soil and groundwater <br />surrounding an underground gasoline storage tank. During one of these <br />investigations, material resembling gas plant wastes (i.e., lampblack) was <br />noted in the northwest corner of the yard approximately 2 to 5 feet below grade. <br />6.4 Hazard Evaluation <br />The following compounds are characteristically found at historical <br />manufactured gas plant sites: <br />Polynuclear Aromatic Hydrocarbons (PNAs) <br />Napthalene (a PNA) <br />Benzene <br />Toluene <br />Ethylbenzene <br />Xylenes <br />Cyanides <br />Sulfides <br />Lead <br />Arsenic <br />Table 4 lists OSHA exposure limits and information on these constituents. <br />The following are results of analyses performed on a single surface soil <br />sample collected at the Tracy site in 1986: <br />Rarameter Concentration <br />PNA's <br />0.9 <br />ppm <br />Lead <br />150 <br />ppm <br />Arsenic <br />15 <br />ppm <br />Mercury <br /><0.1 <br />ppm <br />Cyanide <br /><1.0 <br />ppm <br />3542a/BAV102 31 <br />