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JUN 25 196 11:22AN SMITH ENVIRONMENTAL TECH CORP P.7 <br /> groundwater purged from the wells is temporarily stored in 55-gallon liquid waste drums <br /> approved for this use by the Department of Transportation (DOT)- <br /> Hydrochloric acid (or other appropriate chemical) Is added to the sample vials as a <br /> paresmNative. A sample of the formation water is then collected from the surface of the water <br /> in each of the wells with a clean disposable bailer and slowly transferred to laboratory-cleaned <br /> sample contaiftm. <br /> e be ndl' <br /> Wates 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,identificadon, 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 /> �portirrg Results ofi AnalY� <br /> Hydrocarbon constituents in groundwater samples axe reported by the laboratory in units of ; <br /> parts per biUion (ppb). The, maximum contaminant levels listed in Title 22 of the California <br /> Cbde of Regulations for benzene, ethylbenzene, and total xylene isomers in drinldng water are <br /> 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 /> repasts, groundwater chemical data are reported in units of ppb. <br /> *rW1122Na2gWMdp W <br />