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A ,: M �Z. R � {N C 13 July 1992 (GeoAudit CV 55-59 E2-1.32) Page 2 of 8 3.0 &OIL INVESTIGATION 3.1 BORING LOCRTION5 eight soil borings have been drilled around the A total of g which perimeter of the vault to assess s and other ostructures, il natian. hat a small, The vault is surrounded b4` locations and r be iusedred tfor drilling limited the possible boring SB_ and SB-2 were drilled in January 1992 from the trailer-mounted Soilmaster v0 drilling rig (Figure 2) . vertical to (dig the vault at an angle of 4o degrees from s were north side of beneath the vault. Bath boring e penetrate the soil direct irrrectam augers. Boring SB-1 was drilled to drilled with 8" 22.9 feet true vertical depth) and bottomehe d 19.2 depth of 30 feet ( near the south wall Of t. th of 35 feet (26.8 feet true feet from the surface location, Boring SB-2 was drilled to a dep vertical depth) and bottomed 22.4 feet from the surface location, about 5 feet south of 1991 with 6" hollow- Borings SB-3__through SB-8 were drese borings d in yranged between 15 and stem augers. and were vertical�ogS} . 30 feet in depth (see Boring between borings to prevent cross- The augers were steam-cleaned rater and auger cuttings are contamination, and the decontamination stored in 55-gallon DOT near the vault. 3.2 SAMPLING PROCEDURES were collected ahead of the ubest A 70 - Using Discrete soil samples was used to advance the sampler up a split-tube sampler loaded with three brass sample pound hammer on the drilling rig to 18" into the soil, and thenum intcrva1 waser of recorded on the eboringg tical advance the sampler each samples were collected logs. In borings SB-1 and SB52'and 23 ft; one additional sample was depths of apat 5-fOOt proximately 7, ft. Samples were olth�t�dad tubeLwas collected in SB-2 at 27 in all borings,a portable be was intervals in SB-3 through vapors using to- first screened for hydrocarbon. h aluminum fail, capped, and sealed with duct ionization detector (Thermo Envronmental drandinstruments Model pending ct and then covered wit tape. Samples were then labelled and placed ort for laboratory analysis. �I transpxamined ort the field The second and third tubeswere are r uded shown none the atta chthe boring ---geologistSample descriptions Y logs.