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i. - The vials containing the samples will be labeled with the well <br /> number, date, location, sampler' s initials, and preservative in <br /> indelible ink, and label covered with clear waterproof tape. <br /> The sample vials will be placed in an iced cooler for courier <br /> delivery to a DHS-certified laboratory for analysis, under chain <br /> of c.astody. <br /> 4 .6.5 Blanks <br /> In addition to the groundwater samples, a trip blank and decon- <br /> tamination blank will be collected during each sampling round. A <br /> 40-m1 glass VOA bottle, filled with DI water at the laboratory, <br /> will function as a trip blank. This trip blank will travel- with <br /> the sa.nple kit from the laboratory to the facility and back to <br /> the laboratory again in the cooler containing the samples. The <br /> blank will be analyzed for the same parameters as the samples, <br /> and will indicate if the samples have been contaminated, from <br /> whatever source, during the trip from the site to the laboratory. <br /> A decontamination blank will be prepared in the field during well <br /> -- sampling. After a well is sampled, DI water will be poured into <br /> the clean, rinsed sampling bailer to be used for sampling the <br /> next well. This DI water will then be emptied, as a sample, in-r_o <br /> a preserved 40-m1 VOA bottle for analysis with the samples and <br /> trip blank. The decontamination blank will indicate if there has <br /> been contamination of the samples from the sampling equipment. <br /> 4 . 6.6 Sample Analysis <br /> .� The groundwater samples, trip blank, and decontamination blank <br /> will be analyzed by a DHS-certified laboratory for total petro- <br /> leum hydrocarbons (TPH) by DHS-modified EPA MEthod 8015 and for <br /> aromatic hydrocarbons benzene, toluene, xylenes, and ethylbenzene <br /> ( BTXE) by DHS Method 8020. - <br /> c51 /97780/6-90/tx 12 <br />