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Ms. Wendy Cohen May 19, 2005 Page 2 of 5 (BTEX) by EPA Method 802113; total lead by EPA Method 7420; and gasoline oxygenates and additives (TBA, MTBE, DIPE, ETBE, TAME, 1,2-DCA and EDB) by EPA Method 8260B. TPHg and TPHd were detected in each of the soil samples, at levels ranging from 19 parts per million (ppm) to 6,400 ppm. Ethylbenzene and xylenes were detected at low levels in samples collected from 5, 15, and 20 feet bgs. No benzene or gasoline oxygenates/additives were detected. Lead was present in each sample at low levels. After sampling the excavated soil was placed back in the trench. The location of the exploratory trench is shown on Figure 2. Soil analytical results are summarized in Table 1. The laboratory report, including chain of custody documentation is included in Attachment A. The preliminary results indicated that further investigation was warranted. SITE ACTIVITIES Drilling and Soil Sampling On April 4 and 5, 2005, an experienced Ground Zero geologist supervised the drilling and sampling of five soil borings at the subject site. The borings were advanced by Fisch Environmental (C57- 683865) using a Geoprobe 6600 direct-push drilling rig. The borings were 1 '/<inches in diameter. Borings SBI and SB2 where drilled on April 4, 2005. Boring SB1 was advanced to 58 feet bgs through the approximate center of the former AST containment area. Boring SB2 was advanced to 59 feet bgs, east of the former AST containment area. Borings SB3, SB4 and SB5 were advanced on April 5, 2005. Boring SB3 was drilled to a depth of 61 feet bgs south of the former AST containment area. SB4 was advanced to 60 feet bgs northwest of the former AST containment area. SB5 was advanced directly to 32 feet bgs, northeast of the former AST containment area. The drilling locations are shown on Figure 2. A copy of the drilling permit issued by San Joaquin County Environmental Health Department is included in Attachment B. Copies of boring logs are contained in Attachment C. Soil samples were collected at 5-foot intervals from borings SBI through SB4 using a two-foot long core sampler lined with inert plastic sleeves, which afforded soil identification and subjective evaluation for contamination. Boring SB5 was advanced directly to 32 feet bgs where a soil sample was collected. Soil samples selected for analysis, based upon field observations and photoionization detector (PID) readings, were sealed, labeled, and immediately placed in an iced cooler for transportation under chain of custody protocol to State-certified Argon Laboratories for analysis. The suite of analyses included TPHg and TPHd using EPA method 8015B, and BTEX using EPA Method 8021B. Additionally, selected soil samples were also analyzed for gasoline oxygenates and additives by EPA Method 8260B. G',GROUNDZI:",TIGER\REPORTS\Rev dSBrepoa.dm