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fl1r.� <br /> Water Sample Labeling and Handling <br /> Water samples are preserved in laboratory-cleaned containers which contain appropriate <br /> preservatives. The water samples are sealed with screw caps with Teflon septa to eliminate air <br /> bubbles. The sample containers are labeled in the field with the site identification, monitoring <br /> well number and depth, and date, and promptly placed in iced storage for transport to the <br /> laboratory. The technician or geologist initiates Chain of Custody Records in the field that <br /> accompany the samples to a laboratory certified by the State of California for the analyses <br /> requested. Samples are transported to the laboratory promptly. Samples in our custody are <br /> properly disposed of after their useful life had expired. <br /> Reporting Results of Analyses <br /> Hydrocarbon constituents in groundwater samples are reported by the laboratory in units of <br /> parts per billion (ppb). The maximum contaminant levels listed in Title 22 of the California <br /> Code of Regulations for benzene, ethylbenzene, and total xylene isomers in drinking water are <br /> G- - 1.0, 680, and 1,750 ppb, respectively. The action level established by the California <br /> Department of Health Services for toluene is 100 ppb. To conform with the laboratory <br /> reports, groundwater chemical data are reported in units of ppb. <br /> SHELLSIGWSAMPL.doc <br />