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Ms Lon Duncan July 14, 1999 Page 2 from the spoil pile had 170 mg/kg TPH-diesel (BTEX compounds were not analyzed from the spoil pile) SCOPE OF WORK We have developed the following work scope to address these issues The proposed scope of work is described below Task I- Soil and Groundwater Sampling Soil borings will be drilled at five locations near the former underground tank locations Prior to drilling, we will retain an underground utility locator company to survey the area of the planned borings A licensed drilling contractor will be subcontracted to perform the drilling and sampling One boring (B-1) will be drilled to approximately 50-feet (ft)below grade (bg) at the east end of the former diesel tank Four borings will be drilled to 30-ft bg at locations approximately 15- to 20-ft north, east, south and west of the of the 50-ft boring The planned boring locations are shown on the attached figure The four 30-ft borings will be drilled using direct-push technology(DPT) methods Drilling and sampling equipment will be cleaned prior to each use The 50-ft boring will be drilled using hollow-stem augers Soil samples will be collected at 5-ft intervals (beginning at 10-ft bg) to total depth in the borings using a drive sampler equipped with a plastic liner in the direct-push holes, and brass tubes in the hollow-stem auger hole The soil samples will be retained in the plastic liner and will be capped, labeled and placed in an ice-chest for transport to the laboratory In boring B-1, the samples from below 30-ft bg will be analyzed only if positive detections are found in the 30-ft sample A photo ionization detector (PID) will be used to detect organic vapors in the field from drive samples PID readings will be recorded on the boring logs A groundwater sample will be collected from Boring B-1 using a clean disposable bailer that will be lowered down the center of the augers The augers will be steam-cleaned prior to arrival on site The groundwater sample will be placed in clean sample containers provided by the laboratory Each sample container will be labeled and will be placed on-ice in and ice chest for transport under chain-of-custody procedures to the analytical laboratory A log of each boring will be prepared showing the materials encountered and the depth to groundwater Each borehole will be backfilled with a cement/bentonite grout mixture Waste soil and rinse water developed during site exploration will be placed in 55-gallon drums or plastic sheeting on site pending receipt of analytical results • 11 %?049U645Wordp1an doc 07/14/99