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I <br /> I6. Sample Collection Procedures <br /> Groundwater samples are collected as follows <br /> • A 1-liter Teflon bailer is lowered and partially submerged into the well water to <br /> collect a groundwater sample <br /> • If visible PSH is present in the sample bailer, PSH thickness is recorded on the <br /> field log,and no sample is collected for laboratory analysis <br /> • For volatile organic analyses,groundwater samples are collected in chilled, <br /> 40-milliliter,VOA vials having Teflon-lined caps Hydrochloric acid preservative <br /> Iis added to all vials by the laboratory to lower sample pH to 2 Samples are held <br /> at 2 to 4°Celsius while in the field and to transit to the laboratory Other <br /> appropriate containers, preservatives, and holding protocols are used for <br /> Inon-volatile analyses <br /> • VOA vials are filled completely so that no headspace or air bubbles are present <br /> within the vial Care is taken so that the vials are not overfilled and the <br /> I preservative is not lost <br /> • Sample containers are immediately labeled and sealed after collection to prevent <br /> confusion For VOA vials,the label is placed to overlap the edge of the cap as a <br /> custody seal, unless a separate custody seal is being used <br /> • Samples are stored in a cooler while on site and in transport to the laboratory or <br /> office The cooler has sufficient ice to maintain appropriate temperature prior to <br /> I collecting samples The VOA vials are kept cool both prior to and after filling <br /> Hot or warm containers are not used when volatile compounds are the target <br /> analytes <br /> lie 7. Decontamination Procedures <br /> Decontamination of monitoring and sampling equipment is performed prior to all <br /> monitoring and sampling activities. Decontamination procedures utilize a three—step process as <br /> described below <br /> The initial decontamination is performed using a non-phosphate soap, such as <br /> Simple Green or Alconox, in tap water in a 5-gallon bucket A soft-bristle <br /> bottlebrush is used to thoroughly 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 detonized water is used as a final rinse <br />' The brush is used in the first bucket only; it does not travel from bucket to bucket <br /> with the equipment This minimizes any transport of the contaminants that should <br /> stay in the first bucket <br /> I <br /> 1 <br /> i <br /> 1 <br />