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r 31 January 2000 �...� AGE-NC Project No. 99-0646 Page 2 of 4 3.1. PROBING AND SAMPLING On 15 December 1999, four soil probe borings (probings) were 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 diameter soil sampling assembly. Probings B1, B2 and B4 were advanced to depths of 30 feet bsg while probing B3 was advanced to a depth of 22 feet bsg where refusal was encountered. The probe boring locations are shown on Figure 2. Soil samples were collected at 5-foot intervals, beginning at a depth of 5 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 probe rods and sampling tools used for sample collection were thoroughly rinsed with clean water after washing with a solution of Alconox between each sampling run. All probings were backfilled over their 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 logs. 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 (TPH-g) in accordance with EPA Methods 5030A; and • Volatile aromatics (benzene, toluene, ethylbenzene and xylenes: BTEX) with methyl tert- butyl ether(MTBE) in accordance with EPA method 8020 or 8260. Three soil samples were also analyzed for: Advanced GeoEnvironmental,Inc.