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i II Mr. John Jackson San Joaquin County Environmental Health Department 28 June 2004 Page 3 debris and because of the open top; the SFD did not require any monitoring of the atmosphere within the UST prior to its removal. Prior to the removal of the UST. Thorpe removed the soil and debris in the UST. Approximately 60 cubic yards of material was excavated from around the UST and placed in a stockpile and sarnpled. After the UST was removed, the soil surrounding the UST was observed to be stained and had strong hydrocarbon odors. The UST was observed to have a conical bottom. fThe removed°UST-71 ,was fourld-to'be intact with s=.Mall. holes and pitting: Prior-to-offsite disposal, the-UST_ s labeled with-idcntification ii«n-ibei_39-05.15721"'and the interior washed, the liquid contained and disposed of offsite by American Oil. The UST was loaded onto a truck for transport offsite for t disposal.= - Following the removal of the UST, the&CEHD.inspector requested that one soil sample be, collected and analyzed from below the fomier UST, one from a side wall,'and'one from the soil stockpile. Tlie three samples collected,iticluded:A 4p -ilple;,15UST-BOT-13, collected from a deptht6f.5 feet below the bottom-6-the UST ; (13 feet below ground surface); • Sample 15UST-SSW-7 was collected from the south wall of.the former UST location at a depth of 7 feet below ground surface, and • :'Sample,15UST-STOCKPILE, collected from the,•stockpiled soil. The samples were collected by a Treadwell &Rollo geologist from the native material at the depth below the UST requested by the SJCEHD inspector. Each sample was collected directly from the excavator bucket, hand-packed in a 6-inch stainless steel tube, sealed with TeflonrM sheeting and plastic end caps, and labeled. The soil sample was placed in an ice-cooled container for transport to the laboratory under chain-of-custody protocol. The samples were shipped to Curtis & Tompkins, Ltd., a California-certified laboratory, located in Berkeley, Califomia. As required by the SJCEHD pci nit, the samples were analyzed for Unknown Fuel analytical suite which included: • TPHg (carbon range C7- C12), TPHd (carbon range CIO--C24), using U.S. Environmental Protection Agency (EPA) Testing Method 8015 modified, • Benzene, toluene, ethylbenzene and total xylenes (BTEX) using EPA Testing Method 8021B,