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ice"" N-W.`'=s„:. <br /> � z <br />,� is .N •.r• <br /> l <br /> GROUNDWATER TECHNoLoGY <br /> STANDARD OPERATING PROCEDURE <br /> L'ONCERNING WATER SAMPLING METHODOLOGy <br /> SOP 9 <br /> Prior to water sampling, <br /> Pumping a minimum of fourewellach wvolumesell lorbuntilgthebY <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 when the water <br /> level in the well recovers to Sol of its initial level. <br /> Retrieval of the water rumple, sample handling and sample <br /> preservation shall be conducted it accordance with <br /> il Groundwater Technology Laboratory Standard Operating <br /> Proced:are (GTL Sop 10) concerning 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, <br /> ed <br /> the sampled water such that thehwater stands vial shall babove ltheWith lip <br /> of the vial. The cap should then btu 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 of the sample. Label information should <br /> include a sample identification number, job identification, <br /> date, timetype of analysis requested and the sampler's <br /> name. Chain-of-Custody forms shall be completed as per <br /> Groundwater Technology Laboratory <br /> r, Procedure (SOP 11) concerning CaintofdCustodyard rating <br /> ,.. The vials should be immediately in high quality <br /> coolers for shipment to the la <br /> �. ry• The coolers <br /> should be <br /> 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 10 C. will be considered substandard. 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 /> wells, all the well development and water sampling equip- <br /> ment 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 /> .a. �� Gs�1t\E)1laTEH <br /> L ��_ TECN\UL0GS,k( <br />