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Pacific Gas and Electric Company <br /> 202/799-5043 <br /> July 29 , 1988 <br /> dehydration unit which includes a contact tower and reboiler (see <br /> Figure 2 , Site Plan) . <br /> During the dehydration process at this station, small quan- <br /> tities of water are removed from natural gas and directed to a <br /> shallow sump and an associated discharge line. Apparently, small <br /> quantities of petroleum hydrocarbons and triethylene glycol were <br /> also removed from the gas during the dehydration process . <br /> During the construction of a foundation for a new reboiler, <br /> petroleum hydrocarbons were discovered by PG&E in subsurface <br /> soils near this shallow sump. Approximately 100 cubic yards of <br /> soil were excavated and stock piled on site. Prior to completing <br /> the foundation, PG&E requested GTI to evaluate the subsurface <br /> lie conditions and the feasibility for performing in situ bioremedia- <br /> tion of the affected soils . <br /> SCOPE OF WORK <br /> The following services were performed at the station during <br /> May 1988 as part of this investigation. <br /> " Explored subsurface soil conditions in the vicinity of <br /> the sump and the associated discharge line by drilling, <br /> logging and sampling three soil borings . The borings <br /> were then backfilled with a cement-bentonite grout . <br /> " Analyzed selected soil samples, obtained during <br /> drilling, for total benzene, toluene, ethylbenzene and <br /> xylene (BTEX) and total petroleum hydrocarbons (TPH) <br /> using U.S. Environmental Protection Agency (EPA) <br /> Methods 8020/8015 and 418 . 1 , respectively. In addition, <br /> one sample was analyzed for purgeable volatiles by EPA <br /> 3 <br />