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• Mr. Stephen Schneider <br /> March 9, 1992 <br /> Page 2 <br /> As shown above, TPHg was detected in the water sample at a concentration of 67 parts per billion <br /> (ppb). Total xylenes were also detected at a concentration of 0.6 ppb. Benzene, toluene, and <br /> ethylbenzene were not detected above the laboratory reporting limit of 0.3 ppb. Comparison of the <br /> current sampling results with previous sampling events indicate a continued decreasing trend in <br /> hydrocarbon concentrations in groundwater underlying the former underground storage tank. TPHg <br /> and BTEX concentrations reported in February 1992 were all lower than concentrations reported <br /> in November and August 1991. Ethylene dibromide (EDB)was not detected above the laboratory <br /> reporting limit of 0.02 ppb. The next quarterly sampling episode is scheduled for May 1992. <br /> SOIL REMEDIATION <br /> On October 28, 1991, SEACOR submitted a request for authority to construct and permit to operate <br /> a soil venting system to the SJVUAPD. A permit for authority to construct was issued by the <br /> SJVUAPD on January 25, 1992. We anticipate that construction of the soil remediation system will <br /> begin in March 1992. Following completion of construction of the system, SEACOR will request a <br /> permit to operate from the SJVUAPD. <br /> . Please feel free to contact me at (415) 296-7877 if you have any questions or comments regarding <br /> this letter. <br /> Sincerely yours, <br /> Science & Engineering Analysis Corporation <br /> Bruce Scarbrough, R.G. #4931 <br /> Principal Geologist <br /> cc: Mr. Mardee Kidd <br /> attachment: Laboratory Data Sheets <br />