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.�� R'4�" , r :ua. ` du$- � Lw �''`'w:� k_ F.:=. '_s _ 4" _ •�,y ��a x <br /> I <br /> GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING WATER SAMPLING METHODOLOGY <br /> SOP 9 <br /> - Frior to water samplingr each well. Uhall be purgPd by <br /> pumping a minimum of four well volumes .or until the <br /> discharge water indicates stabilization of temperature, <br /> conductivity,and pli. If the well is evacuated before <br /> four well volumes are re-roved or stabilization is <br /> achieved, the sample should be taken when the water <br /> level in the well recovers to 80% of its initial level. <br /> Retrieval of the water sample, sample handling and sample <br /> preservation shall be conducted in accordance with <br /> Groundwater Technology Laboratory standard Operating <br /> Procedure (GTL SOP 10) concerning sampling For Volatiles <br /> in water". The sampling equipment used shall consist of <br /> a teflon and/or stainicss 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 /> to labeling.,-Df 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 /> 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. simples which <br /> are received at the Groundwater Technology Laboratory <br /> above 10 C. ,will be considered substandrard. 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 ased. <br /> To minimize the potential. for cross contamination between <br /> wells, all the well development and nater sampling equip- <br /> mcnt which contactc the groundwater shall be cleaned <br /> between each well sampling. As a second precautionary <br /> smpled in measure, the wellstrationseasaestablis�heddby previous <br /> er of asing <br /> contaminant <br /> analysis. ., <br /> iJ GRnt'\rn%-%TCH <br /> I <br /> L Tec►ixou►cv,hr. <br /> B� _ <br />