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02 December 1998 AGE-NC Project No. 95-0106 Page 3 of 4 AGE proposes the following scope of work to test the two scenarios and to properly assess the extent and magnitude of the plume: • Advance up to 10 soil probe borings to approximately 18 feet bsg to collect discrete soil and ground water samples near the capillary fringe zone, approximately 6 feet bsg, and from the deeper saturated zone, presumably in sandy soil, at 17.5 feet bsg. Figure 2 shows the proposed probe boring locations. • Continuously sample one soil boring located near MW4 (Figure 2) to establish a complete vertical sequence of soil lithology and to detect potential permeable pathways (sandy soil). • Analyze the soil and ground water samples for TPH-g, BTEX and oxygenated fuel additives in accordance with proper analytical methods. • Analyze selected samples for physicochemical properties and microbiological enumeration. The analyses for physicochemical properties and microbiological enumeration will be useful to evaluate the site for natural attenuation, enhanced bioremediation or bioremediation should remediation of the plume be appropriate. The procedures for advancing the soil probe borings,collecting and preserving soil and ground water samples, constructing boring logs, and obtaining laboratory analyses will be the same as detailed in Work Plan for Soil and Ground Water Investigation, dated 30 November 1995, with the following exceptions: • O-rings will be utilized on all down-hole connections in ground water sampling equipment to minimize cross contamination of deeper ground water by shallower ground water. • The continuous core will be obtained utilizing a macro-sampler with a 4-foot acetate liner. Soil samples for laboratory analysis will be collected from the continuous core by cutting a six-inch section from the acetate liner and preserving in the manner described for the six-inch brass tubes in Work Plan for Soil and Ground Water Investigation,dated 30 November 1995. Upon completion of probing, sampling and laboratory analysis, a report will be prepared summarizing results of the work performed. The report will include recommendations for additional investigation or remediation, if necessary. The report will be in a format acceptable to the PHS-EHD and CVRWQCB and will be reviewed and signed by a California Registered Geologist. Advanced GeoEnviron mental, Inc.