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Mr Steve Schneider <br /> September 30, 1991 r <br /> Page 3 <br /> All six samples collected from the tank pit were analyzed as follows <br /> • EPA Method 8020 for benzene, toluene, ethylbenzene, xylene and EPA JMethod;8015 for total <br /> petroleum hydrocarbons (TPH)-as-gasoline at Superior Ua � } ,, ,,,�� <br /> • EPA Method 6010 for total lead at GTEL <br /> • EPA Method 504 for EDB at GTEL <br /> All analytical results were below detection limits for all parameters The laboratory reports and chain-of- <br /> custody is attached for your review <br /> The lines associated with the underground storage tanks were removed on September 17 Two samples were <br /> collected from the trench bottoms and identified as Trench-1 and Trench-2 The samples were collected by <br /> driving a 2-inch x 6-inch brass tube into the soil at the sampling location The tubes were then caped, taped, <br /> labeled and placed on ice for transportation to a state certified laboratory under standard chain-of-custody <br /> procedures The samples were transported to Superior where sufficient volumes of soil were removed for <br /> analysis of the petroleum hydrocarbons The remaining volume of soil was then transported to GTEL for <br /> analysis of lead and EDB <br /> The trench samples were analyzed using the same methodologies as described for the tank pit samples The <br /> following table summarizes the analytical results for the trench samples in parts per million (ppm) <br /> SAMPLE ID B T E X TPH EDB Lead <br /> Trench-1 < 003 < 003 004 019 <1 0 <02 <5 0 <br /> Trench-2 < 150 47 43 250 2100 <02 <5 0 <br /> The detection limit was raised for benzene on sample Trench-2 because the laboratory had to dilute the sample <br /> to perform the analysis The laboratory reports and chain-of-custody documents are attached for your review <br /> All sampling work related to the underground storage tank and line removal was performed under the <br /> supervision of Ms Pam Violet, representing the San Joaquin Public Health Services <br /> If you have any questions regarding the sample collection and analyses, please feel free to contact me at <br /> (510)671-2387 or Mr Walt Lubcke with Southland Corporation at (510)463-2711 <br /> Sincerely, <br /> GROUNDWATER TECHNOLOGY, INC <br /> Jan Whiffin <br /> Regulatory Affairs Manager, <br /> Western Region <br /> Attachments 2 <br /> cc Mr Hal Miller, Southland Corporation (w/o attachments) <br /> Mr Walt Lubcke, Southland Corporation (w/attachments and original laboratory reports) <br /> GROUNDWATER <br /> 1002DS1 SOU <br /> 1[j, I TECHNOLOGY, INC <br />