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_ <br /> liter amber bottles with Teflon-lined septum caps. The sample bottles contain appropriate pre- <br /> servatives, typically hydrochloric acid. The samples are contained in the containers free of <br /> headspace(i.e.,no air bubbles in the containers). <br /> T he containers containing the samples are labeled with the well number,date,location,sampler's <br /> initials,and preservative in indelible ink,and the sample labels are covered with clear waterproof <br /> tape. <br /> The sample vials are placed in an iced cooler for delivery to a DHS-certified laboratory for <br /> analysis. Standard chain-of-custody procedures are followed. <br /> A.6.5 Blanks <br /> In addition to the groundwater samples,a trip blank and a decontamination blank are analyzed <br /> during each sampling round. A 40-m1 glass VOA bottle with a Teflon septum lid,filled with DI <br /> water at the laboratory,functions as a trip blank. This trip blank travels with the sample kit from <br /> the laboratory to the facility and back to the laboratory again in the sample containing cooler. <br /> The blank is analyzed for the same parameters as the samples to indicate if the samples have <br /> been contaminated,from whatever source,during the trip from the site to the laboratory_ <br /> A decontamination blank is prepared in the field during well sampling. After the first well is <br /> sampled,DI water is poured into the clean,rinsed sampling bailer that is to be used for sampling <br /> the next well. This DI water is then emptied,as a sp mple,into a preserved 40-m1 VOA bottle for <br /> analysis with the samples and trip blank. The decontamination blank indicates if any of the <br /> samples are contaminated from the sampling equipment or decontamination process. <br /> A.6.6 Sample Analysis <br /> All groundwater well samples, the trip blank,and the decontamination blank are analyzed by the <br /> laboratory according to Table 2 of the Tri-Regional Recommendations but typically for total <br /> petroleum hydrocarbons (TPH) by DHS-modified EPA Method 801.5 and for the aromatic <br /> hydrocarbons benzene,toluene,xylenes,and ethylbenzene(BTXE)by DHS Method 8020. <br /> A5 <br />