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6. Sample Collection Procedures <br /> Groundwater samples are collected as follows <br /> • A 1-Mer Teflon bailer is lowered and partially submerged into the well water to collect a <br /> groundwater sample <br /> • <br /> If visible PSH is present in the sample bailer, PSH thickness is recorded on the field log, and no <br /> sample is collected for laboratory analysis <br /> • For volatile organic analyses, groundwater samples are collected in chilled, 40-milliliter, VOA <br /> vials having Teflon-lined caps Hydrochloric acid preservative is added to all vials by the <br /> laboratory to lower sample pH to 2 Samples are held at 2 to 4'Celsius while in the field and <br /> in transit to the laboratory Other appropriate containers,preservatives, and holding protocols <br /> are used for non-volatile analyses <br /> • VOA vials are filled completely so that no headspace or air bubbles are present within the vial <br /> Care is taken so that the vials are not overfilled and the preservative is not lost <br /> • Sample containers are immediately labeled and sealed after collection to prevent confusion For <br /> VOA vials,the label is placed to overlap the edge of the cap as a custody seal, unless a separate <br /> custody seal is being used <br /> • Samples are stored in a cooler while on site and in transport to the laboratory or office The <br /> cooler has sufficient ice to maintain appropriate temperature prior to collecting samples The <br /> VOA vials are kept cool both prior to and after filling Hot or warm containers are not used <br /> when volatile compounds are the target analytes <br /> 7. Decontamination Procedures <br /> Decontamination of monitoring and sampling equipment is performed prior to all monitoring and sampling <br /> activities Decontamination procedures utilize a three—step process as described below <br /> • The initial decontamination is performed using a non-phosphate soap, such as Simple Green or <br /> Alconox, in tap water in a 5-gallon bucket A soft-bristle bottlebrush is used to thoroughly <br /> clean the inside and outside of the equipment <br /> • A second 5-gallon bucket of tap water is used as a first rinse <br /> • A third 5-gallon bucket of deiomzed water is used as a final rinse <br /> • The brush is used to the first bucket only, it does not travel from bucket to bucket with the <br /> equipment This minimizes any transport of the contaminants that should stay in the first <br /> bucket <br /> Main11)\Enwonm=W\Pan=Texa.;uacpcdslSAR1203 wpd <br />