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Mr. John Jackson Treadwell&Wlo San Joaquin County Environmental Health Department 11 June 2004 Page 2 excavator bucket while being exposed. A visual check of the interior of each UST determined the USTs were empty and.dry. Thorpe began the UST removal permit application process with the SJCEHD on 28 April 2004. In preparation for the UST removal, sheet-pile shoring was installed along the southern curb of West Fremont Street to allow for the safe removal of the USTs. On 3 May 2004,Mr. Steven Shih and Mr. Jeff Wong, inspectors for the SJCEHD, and Mr.Kent Miller, fire inspector for the SFD were present for the UST removals. To free the USTs,Thorpe removed the soil immediately surrounding the sides of the tanks. During this excavating a third single-walled steel UST(UST#3)was exposed. UST#3 appeared to be a 500-gallon tank. It was located east of UST#2 in a similar position and burial depth(Figure 2). UST#3 was moderately damaged by the excavator when exposed. It was found to be empty and dry. A total of approximately 50 cubic yards of material was excavated. The excavated material was placed in a soil stockpile and sampled for laboratory analysis. Approximately 5 pounds of dry ice was placed in each UST in order to displace oxygen and limit potential explosive environments. At the direction of Mr. Miller, the USTs were removed. Once removed,the USTs were inspected and observed to be moderately pitted with localized areas of holes (up to '/4-inch diameter) from corrosion. Following the removal of the USTs, the SJCEHD inspector requested that one soil sample be collected and analyzed from the native material below each UST and two samples from the soil stockpile. The five samples collected included: • Sample CAR-UST3-11,collected from a depth of 4 feet below the bottom of the UST3 (11 feet below ground surface), • Sample CAR-UST2-11.3, collected from a depth of 4.4 feet below the bottom of the UST2 (11.3 feet below ground surface), • Sample CAR-USTs-10,collected from a depth of 3 feet below the bottom of the USTI (10 feet below ground surface), and • Samples CAR-USTSS-A and CAR-USTSS-B, collected from the excavated soil surrounding the USTs, segregated in a single stockpile. The samples were collected by a Treadwell&Rollo.geologist from the soil at the depth below the USTs 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 Teflon"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 8�Tompkins, Ltd.,a California-certified laboratory, located in Berkeley,California.