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f <br /> GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> _ CONCERNING WATER SAMPLING METHODOLOGY <br /> SOP 9 <br /> Prior to water Sampling, <br /> Pumping a minimum of four ewell ach wvolumes ell lorbuntulgthe <br /> ed by <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 80% of its initial level. <br /> " Retrieval of ;he water <br /> sample, sample handling and sample � <br /> preservation shall be conducted in accordance with <br /> Groundwater Technology Laboratory Standard Operating <br /> `•` .. I:i Procedure (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 /> 4 e <br /> To insure sample integrity, each vial shall be felled with <br /> the sampled water such that the water stands above the lire <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 prier <br /> r. to labeling of the sample. Label information should <br /> include a sample identification number, job -identification,, ' <br /> & date, tithe, 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 Il) concerning Chain of Custody. <br /> The vials should be immediately placed in high g quality <br /> I _ coolers: for shipment to the laboratory. Thecoolers <br /> 9k-i 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 /> �F above I0 C. will be considered substandard. To miriimize i <br /> y ! �` sample. degradation the prescribed analysis shall` y I1 take <br /> place within seven days of sample collection unless...... <br /> special - - - <br /> r pared acidified vials are used. . <br /> To minimize the <br /> i <br /> 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 Areca'utionary <br /> measure, the welds shall be sampled in order of :increasinq <br /> -.contaminant concentrations as established by previous. <br /> analysis. <br /> GROUNDWA <br /> �' ❑❑❑ECHNOLOGY INC: <br /> CONSULTING GROUNDWATER GEOLOGISTS <br /> i+ : <br /> Eli Im <br />