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• oil and diesel) and volatile aromatics (BTE&X) TPH as motor oil was detected in the soil samples at concentrations up to 150 mg/kg (parts per million), TPH as diesel was detected at concentrations up to 29 ppm After removal, the excavation was backfilled to surface grade On September 20, 1994, one waste oil UST was removed fioni the site GeoAudit collected two soil samples from beneath the tank The samples were ti ansported to AAL and analyzed for TPH as gasoline and diesel, BTE&X, chlorinated hydrocarbons, PCBs and LUFT metals No petroleum hydrocarbons, chlorinated hydrocarbons, PCBs or significant levels of metals were detected ill the soil samples collected from beneath the waste oil tank 2.3 Remaining Undeiground Storage 'Tanks It is our understanding that six additional USTs ale present on the site Each UST is believed to be 10,000-gallon in capacity The tanks are located north of the building and west of the diesel dispenser island (Figure 2) To investigate if hydrocarbon impacted soil or groundwater is present at the site, GeoAudit proposed to drill and sample a series of soil borings at the site • 3.0 PROCEDURES 3.1 Drilling and Sampling On February 21, 1995, four ve;tical soil borings (B-1 through B-4) were drilled at the site. The borings were drilled immediately south of the USTs B-1, B-2 and B-3 were advanced to depths of 25 feet B-4 was advanced to a depth of 20 feet The soil borings were drilled using a truck-mounted CME 75-HT drill rig Tire drill rig and two-man clew were supplied by Soils Exploration Services (SES) of Benecia, California Boiing locations are illustrated in Figure 2 On February 23 and 24, 1995, six additional borings (B-5 through B-10) were drilled at the site Each boring was drilled to a depth of 20 feet using a CME 55 truck-mounted drill rig The drill rig and two-man crew were supplied by SES Boring locations ale illustrated in Figure 2 Samples were collected from each boring at five-foot intervals in each boring using a split tube sampler loaded with three clean, 2-rich by 6-inch brass sleeves A 140-pound hammer was used to advance the sampler 18 inches, the number of blows required to advance the sampler in 6-inch increments was recorded oil the boring logs All sampling equipment was washed in an Alconox solution and rinsed twice with water prior to each sampling run For each sample, both ends of the lead sleeve were covered with aluminum streets, capped 0-1-Vft1 A..W Sw--4 1- 4 F -kf F—d Wo MERl O&MM 199S