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08 January 1997 <br /> AGE-NC Project No. 95-0106 <br /> Page 4 of 5 <br /> laboratory to be analyzed for intrinsic permeability, moisture content and porosity in <br /> accordance with the appropriate ASTM methods. <br /> 14. Develop new monitoring wells utilizing a submersible pump until water is essentially <br /> sediment free. <br /> 15. Survey the top of each well casing to the nearest 1/100th of an inch to determine the <br /> elevation relative to a single well. <br /> 4.2. COLLECTION OF SOIL GAS SAMPLES <br /> For the collection of soil gas samples, the following procedures will be performed: <br /> 1. Prepare a site health and safety plan in accordance with Occupational Safety and Health <br /> Guidance Manual for Hazardous Waste Site Activities (Prepared by National Institute for <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. Install at least six probings, using a van-mounted Geoprobe equipped with a 1.125-inch <br /> diameter probe rods, to depths of approximately 5 feet. Probing locations are illustrated on <br /> Figure 2. <br /> 5. Obtain discrete soil gas samples at the five-feet bsg, using a Geoprobe soil gas sampler. '% `V� <br /> 6. Decontaminate sampling equipment in an Alconox solution and rinse twice with water prior <br /> to each sampling run. <br /> 7. 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 /> A� <br /> 8. Store the samples under ice and transport the samples in a chilled container to a State- <br /> certified laboratory for analysis. `b <br /> 9. Screen soil gas sample duplicates for the presence of volatile organics using a photo- <br /> ionization detector(PID) pre-calibrated to isobutylene. • <br /> 10. Backfill each probing using a concrete-bentonite slurry in the entire depth of the probing. hJ�,'49 <br />