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p f CAMBRIA SAMPLING ACTIVITIES AND SAMPLE ANALYSIS UST Removal K E Curtis Construction Company, Inc (K E Curtis) of Lathrop, California removed one 12,000-gallon and three 10,000-gallon single-wall fiberglass USTs on June 25, 1999 One 10.000-gallon tank contained diesel, and the remaining tanks contained gasoline Mr Steve Sasson of SJCPHS-EHD and Cambria field staff were present to witness the removal and condition of the tanks The tanks were in fair condition with no evidence of holes, cracks, or failure No water was observed in the tank excavation at approximately 17 fbg UST Soil Sampling• On June 25, 1999, Cambria collected nine soil samples from the bottom of the UST excavation at depths ranging from 14 to 17 fbg (Figure 2) Soil was collected using a backhoe and was packed into clean brass sample tubes Tube ends were covered with Teflon tape and sealed with 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 All soil samples collected from the UST excavation, except T6-N-14 and T6-S-17', were analyzed for TPHg by EPA Method 8015 (Modified), benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8020, and fuel oxygenates by EPA Method 8260 Sample T6-N-14' was analyzed for total petroleum hydrocarbons as diesel (TPHd) by EPA Method 8015 (Modified), BTEX, and oxygenates, and sample T6-S-17 was analyzed for TPHd and BTEX In addition, soil samples T8-N-17' and T8-S-17' were also analyzed for total lead by EPA Method 6010 Dispenser and Product Piping Soil Sampling Four product dispensers were removed prior to Cambria's arrival onsite Associated product piping from the dispenser islands was removed while Cambria and SJCPHS-EHD personnel were onsite on June 25, 1999 Soil samples from beneath the former product dispensers and piping were collected at locations specified by the SJCPHS-EHD Four samples were collected from native soil beneath the former product dispensers at approximate depths ranging from 3 to 4 fbg Three soil samples were collected from native soil beneath the former product piping at approximate depths ranging from 3 5 to 5 fbg Sample locations are shown on Figure 2 These soil samples were analyzed for TPHg, TPHd, BTEX, fuel oxygenates, and total lead Over-Excavation Petroleum hydrocarbons were detected in several soil samples collected on June 25, 1999 Cambria returned to the site on August 1 1 and 12, 1999 to remove impacted soil and collect additional samples in these areas Over-excavation was performed in the 241-1399 3