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c <br /> k .Y <br /> I <br /> GROUNOWATER TECHNOIAGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING WATER SAMPLING YrEIRODOLOGY <br /> SOP 9 <br /> Prior to water sampling, each well shall ioe <br /> purged by <br /> Pumping a minimum of four well volumes or until the <br /> discharge water indicates stabilization of temperature, <br /> ccnductivity,and pH. If the well is evacuated before <br /> four well volumes are removed or stabilizat1o,, is <br /> achieved, th4 sample should be taken when th_ water <br /> level in the well recovers to 8" of its initial level. <br /> preservation shall be conducted in acu;�rdance with <br /> Retrieval of the water sample, sample handling and sample <br /> Groundwater Technology Laboratory Standard Operating <br /> Procedure (GTL Sop 10) concerning Sak9ling For Volatiles <br /> in Water's. The sampling equipment used shall consist ai <br /> } a teflon and/or stainless steel samplers, which meets <br /> EPA regulations. Glass vials with teflon lids should be <br /> used to store the collected samples. <br /> = To insure sample integrity, each vial shell be filled with <br /> the sampled water such that the water stands above the lip <br /> of the vial. The cap should then be <br /> vial and tightened secureZ vshould then quickly placed a the <br /> L. checked to ensure that air securely. <br /> sare notsent pr <br /> to labeling of the sample. Label information eshould4or <br /> include a sample identification Number, job identification, <br /> date, time, type of analysis requested and the samplers <br /> name. Chain-of-Custody forms shall be completed as per <br /> Groundwater Technology Laboratory Standard Operating <br /> Procedure (SOP 11) concerning Chain of Custody. <br /> The vials should be immediately placed in high quality <br /> coolers for shipment to the laboratory. The coolers <br /> should be packed with sufficient ice or freezer. .packs to <br /> ensure that the samples are kept below 4C. Samples which <br /> are received at the Groundwater Technology Laboratory <br /> above 30 C. will be considered substandard. To minimize <br /> sample degradation the <br /> prescribed <br /> place within seven daysofsample collesis ctionhunlesske <br /> specially prepared acidified vials are used. <br /> To minimize the potential for cross contamination between <br /> wells, all the well development and water sampling equip- <br /> tent which contacts the groundwater shall be cleaned _ <br /> between ,each well sampling. As a second precautionary <br /> measure, 'the wells shall be sampled in order of increasing <br /> contaminant concentrations as established by previous <br /> analysis. <br /> i <br /> GRDINDWATER <br /> I <br /> TECH ti ouicy.I�C. <br />