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12 April 1996 <br /> AGE-NC Project No. 95-0137 <br /> Page 4 of 6 <br /> 10. Log borings in accordance with the Unified Soil Classification System. <br /> 11. Collect ground water samples from selected probings. Each ground water sample will be <br /> collected using a Geoprobe water sampling assembly. The samples will be collected in 40-m1, <br /> EPA approved, VOA vials and amber 1-liter bottles, using a Geoprobe water sampling <br /> assembly. <br /> 12. Backfill each probing using a concrete-bentonite slurry in the entire depth of the probing. <br /> 13, Selected soil samples and ground water samples will be analyzed for total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g), total petroleum hydrocarbons quantified as <br /> diesel (TPH-d) and volatile aromatics (benzene, toluene, ethyl benzene and total xylenes: <br /> BTE&X) in accordance with the appropriate EPA methods. <br /> 4.2. Ir14"STALLATION OF GROUND WATER MONITORING NVELLS <br /> If hydrocarbon-impacted ground water is encountered on the Jimco property during the investigation, <br /> the PHS-EI-?D may require the installation of a ground water monitoring wells. The following <br /> procedures will be performed for the installation of monitoring wells: <br /> I, Notify the PHS-EHD 48 hours prior to commencement of any work, while securing proper <br /> city/county soil boning permits. <br /> 2. Boring locations Mll be marked at least 48 hours in advance for an Underground Service <br /> Alert (USA) check of underground utilities or pipes. <br /> 3. Advance each boring using a truck-mounted drill rig, and 8.25-inch diameter hollow stern <br /> augers. Each boring will be advanced to depths of 30 feet bsg. The boring locations will be <br /> approved by the PHS-EHD prior to drilling. <br /> 4. Decontaminate all sampling equipment in 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, beginning at 10 feet bsg, utilizing a California split-spoon sampler and <br /> pre-cleaned 2-inch by 6-inch brass sleeves. <br /> 6. Preserve soil in the brass sleeve by covering both ends with 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 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 />