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26 September 2002 AGE-NC Project 02-0946 Page 2of5 laboratory analysis of the 15-foot sample from boring B-5 did not detect volatile organic compounds (including BTEX and MTBE) or polychlorinated biphenyls. • Subsequently, a geophysical (magnetometer) survey of a portion of the site was performed to locate potential anomalies(underground storage tanks[USTs]or other buried structures). • July 2002-Four exploratory trenches(T-1 through T-4)were excavated utilizing a backhoe and three soil probe borings were advanced at the site; the trenches were excavated at locations identified during the magnetic survey as possible USTs or buried structures. Trenches T-1, T-2 and T-4 contained assorted waste material; soil samples from the soil borings did not detect petroleum hydrocarbons at the depths sampled. Petroleum hydrocarbons and volatile organic compounds were detected in a grab ground water sample at concentrations of 270 micrograms per liter (µg/1) TPH-g, 2.6 µg/l toluene, 2.3 µg/1 ethylbenzene,27.6 µg/1 total xylenes,3.7 µg/1 napthalene, l.l µg/l n-propylbenzene314µg/1 1,2,4-trimethylbenzene, 4.1 µg/1 1,3,5-trimethylbenzene and 1.2 µg/1 n-butylbenzene; however, the detected concentrations of VOCs do not exceed the state of California Department of Health Services' (DHS)Maximum Contaminant Levels(MCLs)and Action Levels (ALs). SCOPE OF WORK The proposed scope of work will include the following tasks: • Planning and pre-field work activities. • Soil excavation and sample collection/analysis. • Soil disposal. • Report preparation. PRE-FIELD WORK ACTIVITIES A health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization,the area of excavation will be clearly marked and an utility clearance obtained through Underground Service Alert. Permits required from other agencies will be procured. Advanced GeoEnvironmental,Inc.