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Nftw • 001 <br /> 1 December 1995 <br /> AGE-NC Project No. 95-0106 <br /> Page 4 of 5 <br /> Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental <br /> Protection Agency, 1985). <br /> 2. Notify the PHS-EHD 48 hours prior to commencement of any work, while securing proper <br /> city/county soil boring permits. <br /> 3. Boring locations will be marked at least 48 hours in advance for an Underground Service <br /> Alert (USA) check of underground utilities or pipes. <br /> 4. Notify the PHS-EHD 48 hours prior to commencement of any work. <br /> 5. Install six probings, using a van-mounted Geoprobe equipped with a 1.125-inch diameter <br /> probe rods, to depths of approximately 15 feet. Probing locations are illustrated on Figure 2. <br /> 6. Decontaminate sampling equipment in an Alconox solution and rinse twice with water prior <br /> to each sampling;run. <br /> 7. Obtain discrete soil samples at five-foot intervals, starting at 5 feet, using Geoprobe soil <br /> sampler assembly loaded with pre-cleaned 1.125-inch by 6-inch brass sleeves. <br /> 8. Preserve soil in the second brass sleeve by covering both ends with Teflon sheets, capping, <br /> and sealing with tape. Label and log samples on a chain-of-custody form. <br /> 9. Store the samples under ice and transport the samples in a chilled container to a State- <br /> certified laboratory for analysis. <br /> 10. Screen soil sample duplicates for the presence of volatile organics using a photo-ionization <br /> detector (PID) pre-calibrated to isobutylene. <br /> 11. Log borings in accordance with the Unified Soil Classification System. <br /> 12. Collect three ground water samples. We anticipate collecting one grab ground water sample <br /> from the probing north the former UST excavation, a second grab ground water sample will <br /> be collected from a probing located on the southern most probing. A third sample will be <br /> collected from the probing advanced on the northern boundary of the site. The samples will <br /> be collected in 40-m1, EPA approved, VOA vials, using a Geoprobe water sampling assembly. <br /> 13. Backfill each probing using a concrete-bentonite slurry in the entire depth of the probing. <br /> 14. Selected soil samples and the each water samples will be analyzed for total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g) and volatile aromatics (benzene, toluene, <br /> ethylbenzene and total xylenes: BTE&X) in accordance with the appropriate EPA methods. <br /> 4.2. EXCAVATION BACKFILLING <br /> For backfilling of the excavation, the following procedures will be followed: <br />