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.,.r 31 January 2000 AGE-NC Project No. 98-0451 Page 2 of 3 3.1. PROBING AND SAMPLING — On 11 January 2000, one soil probe boring (probing) was advanced at the site using AGE's Geoprobe 5400 soil probing unit equipped with 1.25-inch diameter probe rods and a 1.5-inch y diameter soil sampling assembly. Probing B 1 was advanced to a total depth of 30 feet bsg. The probe boring Iocation is depicted on Figure 2. Soil samples were collected at 5-foot intervals, beginning at a depth of 10 feet bsg, using the Geoprobe soil sampling assembly loaded with four 1.125-inch by 6-inch brass sleeves. After collection, the ends of the second brass sleeve were covered with aluminum sheets, capped and sealed with tape. The sleeves were labeled and placed in a chilled container and selected samples were transported under chain-of-custody to Alpha Analytical Laboratories, Inc. (AAL) in Ukiah, California,a State of California Department of Health Services(DHS)-certified analytical laboratory. All sampling tools used for sample collection were thoroughly rinsed with clean water after washing with a solution of Alconox between each sampling run. The probing was backfilled over the entire _ depth with portland cement. _ 3.2. LOGGING Soil was extruded from a second brass sleeve and screened for the presence of organic vapor using an organic vapor meter equipped with a photo-ionization detector (PID: Thermo Environmental 580A, 10.0 eV, calibrated to isobutylene). The organic vapor readings were then recorded on the boring log. The soil was visually described in accordance with the Unified Soil Classification System and recorded (see Appendix A - Boring Logs). 3.3. LABORATORY ANALYSIS -- Selected soil samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d — and TPH-mo, respectively) in accordance with EPA Methods 5030 and 8015m; • Volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and xylenes: BTEX) in accordance with EPA method 826013; and • Fuel oxygenates; di-isopropyl ether(DIPE), ethyl tert-butyl ether (ETBE), methyl tert-butyl ether(MTBE), tert-amyl methyl ether (TAME), and tert-butanol (TBA) in accordance with EPA Method 8260B. Advanced GeoF.nvlronn ental, Inc.