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1 <br /> - <br /> i 1 J <br /> 6 June 1995 <br /> AGE-NC-95-0142 <br /> Page 3 of 4 <br /> 10) Backfill each probing using a concrete-bentorute slurry in the entire depth of the probing <br /> 42 COLLECTION OF SOIL VAPOR SAMPLES - <br /> For the collection of soil vapor samples, the following procedures will be performed <br /> 1 <br /> 1) Install rune probings, using van-mounted, 1 125-inch diameter probe rods to depths of <br /> approxiinately 40 feet The boring locations are depicted on Figure 2 <br /> 2) Collect soil vapor samples, at 10 foot intervals, in Tedlar bags <br /> 3) Store vapor samples in a cool container and transport to a State certified laboratory for <br /> analysis <br /> 4) Field screen soil vapor samples for volatile organics using a PID <br /> • 5) Decontaminate probe strings prior to advancement of each probing to avoid cross <br /> contamination <br /> 6) Label and log vapor samples on a chain-of-custody form <br /> 7) Selected vapor samples may be analyzed for total petroleum hydrocarbons (TPH as gasoline) <br /> and volatile aromatics (BTE&X), in accordance with EPA methods 5030/8015 and 8020, <br /> respectively <br /> 8) Backfill each probing using a concrete-bentonite slurry in the entire depth of the probing <br /> 43 REPORTING <br /> A report detailing the results of the work will be prepared The reportwill be in a format acceptable <br /> to the PHS-EHD and Central Valley Regional,Water Quality Control,Board The report will be <br /> reviewed"and signed by a California Registered Geologist <br />