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C A M B R I A Ms Michelle Le • June 3, 2005 SAMPLING ACTIVITIES AND SAMPLE ANALYSES On March 25, 2005, Paradiso Mechanical, Inc (Paradiso) of San Leandro, California removed three 12,000-gallon, double-wall fiberglass gasoline USTs, four dispensers, associated product piping, and a 550-gallon waste oil UST Cambria's standard procedures for UST, dispenser, and piping removal and excavation sampling are presented as Attachment A Personnel Present • Michelle Le, R E H S , SJCEHD • Harlin Knoll, R E H S , SJCEHD • Mark Freitas, Construction Foreman, Paradiso •� Ron Barone, Staff Geologist, Cambria Sampling Dates March 25 and April 7, 2005 UST Removal Observations Cambria observed no cracks or holes in the USTs UST Excavation Soil Sampling Cambria collected soil samples from the bottom of the UST excavations Nine samples (TP-1 through TP-9) were collected at a depth of 14 feet below grade (fbg) from the gasoline UST excavation and one sample (TP-10) was collected at 12 fbg in the waste oil UST excavation Figure 2 shows sampling locations Soil samples were collected from the tank excavation using an excavator The soil was removed from the excavator bucket, packed into clean brass sample tubes, and tube ends were covered with Teflon tape and plastic end caps Soil samples were labeled, placed into a cooler with ice, entered onto a chain of custody record, and transported to a California-certified analytical laboratory Dispenser and Product Piping Soil Sampling Cambria collected soil samples from beneath the former product dispensers (D-1 through D-4) and piping (P-I through P-3) from native soil at approximate depths ranging from 4 to 4 5 fbg (Figure 2) Soil samples were collected using a backhoe in the manner described above Over-Excavation Sampling Cambria directed over-excavation activities in the UST excavation Cambria conducted vertical over-excavation in a portion of the UST excavation, and the final depth was 19 fbg Figure 2 shows the extents of over-excavation Cambria collected five confirmation samples (TP-2, TP-3, TP-5, TP-6, and TP-9) at a depth of 19 fbg from the bottom of the UST excavation (Figure 2) Soil samples were collected using an excavator in the manner described above 4 Chemical Analyses All soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX), and fuel oxygenates (tert-butyl 2 rl __