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FORMER SERVICE STATION—SOIL SAMPLING METHODOLOGY Page 2 <br /> 18894 N Lower Sacramento Road September 15,2004 <br /> Immediately following collection, the sample was sealed with aluminum foil and plastic end caps, <br /> labeled, and sealed again in a plastic Ziploc bag. The sample was placed in a precooled ice-chest <br /> and transported under continuous chain-of-custody to Blackburn Consultings Auburn, California <br /> office where it was refrigerated until Blackburn was requested to submit the sample for laboratory <br /> analyses. The sample was analyzed on a 24-hour turn-around for benzene, toluene, ethyl benzene, <br /> and total xylenes (BTE&X), gasoline, diesel, and motor oil. <br /> At that time the sample was again transported under continuous chain-of-custody documentation <br /> to Excelchem Laboratory for analysis. At the time the laboratory received the sample it had <br /> exceeded the recommended 14-day holding time by two days; however, given the intent of the <br /> testing, which is generally to screen the sample for potential hydrocarbons, the extended holding <br /> time is not,an issue. <br /> LIMITATION <br /> BCI's ISA identified an old uncharacterized service station at the pothole location. The lack of <br /> significant contamination in the top 5 feet of soil at this location does not preclude the existence of <br /> nearby, unidentified residual hydrocarbon impacted soil and/or groundwater. <br /> This letter only describes conditions noted at one location and is not a statement or opinion <br /> regarding potential residual contamination associated with the former service station. <br /> Sincerely, <br /> BLA7Pattn <br /> CONSUL ING, INC. <br /> Jeff S <br /> Principal Engineer <br /> cc: Najee Zarif, County of San Joaquin <br /> Chris Rockway, Mark Thomas and Company, Inc. <br />