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Nwe <br /> 12 February 1996 <br /> AGE-NC Project No.95-0106 <br /> Page 4 of 6 �(L� <br /> 3.4. BACKFILLING OF EXCAVATION <br /> The subsurface investigation of the site indicated that hydrocarbon impacted soil/iaterally extensive, <br /> but only within the saturated zone. Therefore, clean backfill material, withatrix, will be <br /> placed into the excavation over a rock base with a geotextile material cover. Any standing water in <br /> the former UST excavation will be removed and drummed on-site prior to the backfilling procedures. <br /> The remaining excavated soil, stockpiled on-site, will be disposed at a licensed landfill facility. <br /> 4.0. PROCEDURES <br /> 4.1. INSTALLATION OF GROUND WATER MONITORING WELLS <br /> The following procedures will be performed 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 four soil borings, using a truck-mounted drill rig, and 8.25-inch diameter hollow <br /> stem augers. Four borings will be advanced to depths of 15 feet. 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 soil from each boring, beginning at 3 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 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 /> 9. Log borings in accordance with the Unified Soil Classification System. <br /> 10. Selected soil samples will be analyzed for TPH-g, BTE&X, MTBE and TOC in accordance <br /> with the appropriate EPA methods. Selected soil samples will be released to a State-certified <br />