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31 January 1997 <br /> AGE-NC Project No. 97-0298 <br /> Page 4 of 6 <br /> 10. Collect grab ground water samples from selected probe,.borings. Ground water samples will <br /> be collected from each.probe.borings using a Geoprobe water sampling assembly. Samples <br /> will be collected in 40-m1 VOA vials, labeled and placed in a chilled container. <br /> 11. Backfill each probe borings using a.concrete-bentonite slurry in the entire depth of the <br /> probing. <br /> 12. Selected soil and ground Nater samples will be analyzed by an on site State-certified <br /> laboratory. The samples will be analyzed for TPH-g.BTE&X and MTBE 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 at the'site, the PHS-EHD will require the <br /> installation of at least three(3)ground water monitoring wells. Proposed locations of the monitoring <br /> wells will be submitted to the PHS-EHD for review and concurrence prior to.initiation of installation <br /> procedures. <br /> The following procedures will be performed for the installation of ground water.monitoring wells, <br /> if necessary: <br /> 1. Notify the PHS-EHD 72 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 four soil borings using a truck-mounted drill rig, and 8.25-inch diameter hollow <br /> stem augers. Soil boringswill be advanced to depths of approximately 55 feet. Boring <br /> locations will be approved by the PHS-EHD prior to drilling. <br /> 4. Decontaminate all sampling equipment in an alconox solution and rinse twice with water <br /> prior to each sampling run. Steam-clean auger-flights before advancement of each boring. <br /> 5. ' Sample soil from each boring, beginning at five feet bsg,utilizing a California split-spoon <br /> sampler and pre-cleaned 2-inch by 6-inch brass sleeves or using a split barrel continuous core <br /> sampler. <br /> 6. Preserve soil in the brass sleeve by covering both endswith aluminum foil or Teflon tape, <br /> capping, and sealing with tape. <br /> 7. Store the samples under .ice and transport the samples in a chilled ice chest to a State- <br />