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10 August 1998 AGE-NC Project No. 98-0471 Page 3 of 8 attached laboratory report and quality control data. Selected samples were analyzed by: • EPA Method 8015 modified for total petroleum hydrocarbons quantified as gasoline, diesel, motor oil (TPH-g, TPH-d and TPH-mo), • EPA Method 8020 for purgeable aromatics (benzene, toluene, ethylbenzene and total xylenes: BTE&X, including methyl tertiary butyl ether: MTBE), and by • EPA Method 6010/200.7 for the metals cadmium, chromium, lead, nickel and zinc. The excavations were backfilled using imported fill sand, supplied by Conti Materials Service, Inc. Compaction was performed using a backhoe. On 20 July 1998, at request of Herum, Crabtree et al, trenching was continued to determine the lateral extent of impacted soil and ground water. Five additional trenches were established on the site. Soil was collected from three of the trenches, and water samples were collected from four of the trenches. Ground water was encountered in four of the five trenches at a depth of approximately 8 feet bsg but eventually the water level stabilized at 6.5 feet bsg. The excavation limits are depicted on Figure 2. Trench T5 was established fifteen feet north of the trench T1. Trench T6 was installed approximately forty feet east of trench T1 near the edge of the concrete pad of the fueling area. Trench T7 was installed 40 feet west of the fueling area. Trench T8 was established sixty-five feet east of the fueling area for the collection of a ground water sample. Trench T9 was installed thirty feet north of the fueling area for the collection of a grab water sample. Soil samples were collected from three of the trenches at depths of two feet bsg and five feet bsg. Grab water samples were collected from the water which intruded into trenches T5, T7, T8 and T9. The soil and water samples were collected under the sampling protocol described above. 3.2. COLLECTION OF SURFACE WATER SAMPLES Surface water was present in the narrow"ditch"located east of the maintenance area on the property. A sample of the water was collected from the ditch on 03 July 1998 and also on 08 July 1998 before trenching actives were commenced. The sample sets were collected in EPA-approved VOA vials containing nitric acid to preserve the water sample and into 1-liter amber bottles. The samples were Advanced GeoEnvironmental,Inc.