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GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> M CONCERhlNG WATER SAMPLING ME'T'HODOLOGY <br /> SOP 9 <br /> Prior to water sampling, each well shall be purged by <br /> pumping a minimum of four well volumes or until the <br /> discharge water Indicates stabilization of temperature, <br /> conductivity,and pH. If the well is evacuated before <br /> four well volumes are removed or stabilization is <br /> achieved, the sample should be taken whan the water <br /> level in the well recovers to 802 of its initial level. <br /> Retrieval of the water sample, sample handling and sample <br /> preservation shall be conducted in accordance with <br /> Groundwat_r Technology Laboratory Standard Operating <br /> Procedure (GTL SOP 10) cots,.erning Sampling For Volatiles <br /> in Water". The sampling equipment used shall consist of <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 shall be filled with <br /> the sampled water such that the water stands above the lip <br /> of the vial. The cap should then be quickly placed on the <br /> vial and tightened securely. The vial should then be <br /> checked to ensure that air bubbles are not present prior <br /> ch <br /> ch labeling o£ the sample. Label information should <br /> include a sample identification number, job identification, <br /> date, time, type of analysis requested and the sampler's <br /> name. Chain-of-Custody forms shall -be completed as per <br /> Groundwater Technology Laboratory Standard Operating <br /> ?rocedure (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 <br /> packed with sufficient ice of froezer packs to <br /> ensure that the samples are kept below 4C. Samples which <br /> are received at the Groundwater Technology Laboratory <br /> above 1'3 C. will be considered substandard. <br /> To minimize <br /> sample degradation the prescribed analysis shall take <br /> place within seven days of sample collection unless <br /> Specially prepared acidified vials are used. <br /> To minimize. the potential for cross contamination between <br /> nt and water sampling equip- <br /> wells, all the well developmethe groundwater shall be cleaned <br /> ment which contacts <br /> between each well sampling. As a second precautionary <br /> measure, the wells shall be sampled in order oYeviausasing <br /> contaminant concentrations as established by p <br /> analysis. <br /> er <br /> 1001011=11E Noll I <br /> �:.' <br />