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05 February 1996 <br /> AGE-NC Project No. 95-0135 _ <br /> Page 4 of 5 - <br /> 10. Collect three ground water samples. Ground water samples will be collected from selected <br /> probings using a Geoprobe water sampling assembly. Samples will be collected in 40-m1 <br /> VOA vials, labeled and placed in a chilled container. <br /> 11. Backfill each probing using a concrete-bentonite slurry in the entire depth of the probing. <br /> 12. Selected soil and ground water samples will be transported to a State-certified laboratory and <br /> analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g) and volatile <br /> aromatics (benzene, toluene, ethyl benzene and total xylenes: BTE&X) in accordance with <br /> the appropriate EPA methods. <br /> 4.2. INSTALLATION OF GROUND WATER MONITORING WELLS <br /> If hydrocarbon-impacted ground water is encountered during the probininvestigation, the PHS- <br /> Z.,EHD will require the installation of a ground water monitoring wells to determine site-specific ground <br /> water conditions. The following procedures will be perforated for the installation,of monitoring wells: <br /> 1. Notify the PHS-EHD 48 hours prior to commencement of any work, while securing proper <br /> city/county soil boring permits. <br /> 2. 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 /> 3. Advance three soil borings using a truck-mounted drill rig equipped with 8.25-inch diameter <br /> hollow stem augers. The borings will be advanced to depths of approximately 55 feet. The <br /> boring locations and well design will be approved by the PHS-EHD prior to drilling. <br /> 4. Decontaminate all sampling equipment ut an alconox solution and rinse twice with water prior <br /> to each sampling run. Steam-clean auger flights before advancement of each boring. <br /> 5. Sample each boring at five foot intervals, beginning at 5 feet bsg, utilizing a California split- <br /> spoon sampler and pre-cleaned 2-inch by 64rich brass sleeves. <br /> 6. Preserve soil in the brass sleeve by covering both ends with Teflon sheets, capping, and <br /> sealing with tape. <br /> 7. Store the samples under ice and transport the samples in a chilled ice chest to a State-certified <br /> laboratory for analysis. <br /> 8. Screen soil sample duplicates for the presence of volatile organics using a photo-ionization <br /> detector (PID) pre-calibrated to isobutylene. <br /> 9. Log borings in accordance with the Unified Soil Classification System. <br /> 10. Selected soil samples will be analyzed for TPH-g and BTE&X in accordance with the <br />