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detection compound either 1,1-difluoroethane or isopropyl alcohol will be placed in the vicinity of <br /> the borehole seal and the connection between the plastic tubing from the probe and the Summa <br /> canister regulator. The leak detection compounds are not associated with the LNC Site and <br /> therefore provide a means of leak detection. <br /> Once the soil gas sample has been collected the sampling rod will be withdrawn and the hollow <br /> stem augers will be backed out for five feet to allow the bentonite slurry seal to be punched out <br /> of the augers. Once drilling is resumed soil samples will be collected until the next interval <br /> where soil gas is to be collected is reached. The soil gas sample will then be collected as <br /> outlined above. <br /> Soil gas samples shall be transported to the laboratory under chain-of-custody procedures using <br /> the containers supplied by the laboratory or in clean plastic coolers with packing materials. Ice <br /> cooling is not required, and sample holding time is 30 days. <br /> Quality control samples shall include one ambient air sample per day and one duplicate sample. <br /> One trip blank shall be included with each batch of samples sent to the laboratory. Trip blanks <br /> are to be submitted to the laboratory on hold pending the results of the accompanying samples. <br /> If no anomalies are found in the samples accompanying the trip blank, the trip blank will not be <br /> analyzed. All samples including quality control samples will be analyzed by USEPA Test <br /> Method TO-15 for the list of analytes given in Section 3.1. <br /> The shallow soil borings will be sampled at depths immediately above the "A" Clay(25 to 27 <br /> feet bgs) at the site. Only one soil gas sample per shallow soil boring will be collected and <br /> analyzed. The collection procedures will be the same as for the deep soil borings. <br /> M ain\D:AEnvironmenta1\LN CV\10152007.wpd 36 <br />