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t Final Remedial Plan - Geweke <br /> 2 January 1992 <br /> Page 10 of 15 <br /> .5) Monitor auger returns for the presence of organic vapors using <br /> a photo-ionization detector (PID) . <br />' 6) Log auger returns in accordance with the Unified Soil <br /> Classification system. <br />' 7) To avoid cross-contamination, steam-clean auger flights prior <br /> to drilling each boring. <br /> 8) Obtain discrete soil samples using a split-tube sampler at 5- <br /> foot intervals starting from a depth of 10 feet in each of the <br /> borings. <br />' 9) Wash sampling equipment in tri-sodium phosphate (TSP) solution <br /> and rinse twice with water prior to each sampling run. <br />' 10) Transport soil samples in a chilled container to a State <br /> certified laboratory within 24 hours. <br /> 11) Analyze selected soil samples for total petroleum hydrocarbon <br /> (TPH) in accordance with the DHS approved method for gasoline <br /> and for purgeable aromatic hydrocarbons (BTE&X) in accordance <br />' with EPA method 8020 . The number of soil samples to be <br /> analyzed is subject to discussion with, and final approval of <br /> the SJEHD. <br /> 12) Convert the borings into extraction wells. The design of the <br /> extraction wells is depicted on Figure 5 . <br />' 13) Prepare a report detailing the findings in a format to be <br /> submitted. to the SJEHD <br />' 3 . 7 . 3 . INSTALLATION OF VACUUM EXTRACTION SYSTEM <br /> 1) Construct a lockable station in the area that would not impact <br />' the operation on the site. <br /> 2) Extend the existing natural gas line and provide a proper <br /> connection to the vacuum extraction unit. This item is <br /> conducted by PG&E personnel. <br /> 3 . 7 . 4 . INSTALLATION OF VAPOR EXTRACTION LINES <br /> 1) Connect a 2-inch diameter PVC (Schedule 40) line to the <br />' extraction wells. Install ball valve at each line for <br /> individual or manifold extraction selection. <br />