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Pacific Gas and Electric Company <br /> 202/799-5043 <br /> July 29 , 1988 <br /> SUMMARY AND CONCLUSIONS <br /> As indicated from the laboratory analyses results , petroleum <br /> hydrocarbons and triethylene glycol are present in soils in the <br /> vicinity of the reboiler . TPH in the lower boiling point range <br /> (as analyzed for by EPA Method 8015 ) , and TPH in the higher <br /> boiling point range (as analyzed for by EPA Method 418 . 1 ) as well <br /> as triethylene glycol were detected in samples obtained from SB- <br /> 1 . TPH concentrations by EPA Method 418 . 1 ranged from 1400 ppm <br /> at a depth of 6 . 0 feet to below the analytical method detection <br /> limit at other depths in SB-1 . TPH concentrations by EPA Method <br /> 8015 ranged from 1400 ppm at a depth of 3 . 0 feet to 28 ppm at a <br /> depth of 12 . 5 feet in SB-1 . In general , concentrations of TPH <br /> were observed to decrease with depth. TPH by EPA Method 8015 <br /> were detected in sample SB-2D at a concentration 1100 ppm at a <br /> depth of 12 . 5 feet , and in sample SB-3C at a concentration of 72 <br /> ppm at a depth of 3 . 5 feet . TPH by EPA Method 418 . 1 were <br /> detected in samples SB-2C and SB-3C at concentrations of 160 ppm <br /> at a depth of 9 . 5 feet and 8 ppm at a depth of 3 . 5 feet , respec- <br /> tively. <br /> Triethylene glycol was det : - : ,. ' _y one sample, SB-1B, <br /> at a concentration of 12 , 000 ppm at a depth of 6. 0 feet . All <br /> other samples analyzed for triethylene glycol were non- <br /> detectable . <br /> Additional analyses performed on SB--1B indicated that <br /> concentrations of all other compounds analyzed were either non- <br /> detectable or below State Department of Health Services (DHS) <br /> action levels (see Appendix III ) . <br /> 10 <br />