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1. <br /> WESTF RN 1: o 1. 0 G I C R ESOP; H [ <br /> H i STANDARD OPERA'T'ING PROCEDURES <br /> RE.GROUNDWATER PURGING AND SAMPLING <br /> SOP-4 <br /> Prior to water sampling, each well is purged by evacuating a minimum of three wCHand pH sta . Tic <br /> casing <br /> volumes of groundwater or until the discharge water temperature,conductivity <br /> groundwater sample should be taken when the water level in the well recovers to go ro of its s�atic level <br /> ~ The sampling equipment used consists of either a tenon bailer or a stainless steel bladder pump <br /> with a teflon bladder. If the sampling system is dedicated to the well,(ben LAe bailer is made of teflon, <br /> but the bladder pump is PVC with a polypropylene bladder. Forty milliliter mel <br /> O analysis(VOA)vi )glass olatifc-organic- <br /> ) als,with teflon septa,are used as sor+aple containers. <br /> The groundwater sample is decanted into each VOA vial in such a mane: that there is a <br /> meniscus at the top of the vial. The cap is quickly placed over the top of the vial and securely tightened. <br /> The VOA vial is then inverted and tapped to see if air bubbles are present. If none ara present,the <br /> sample is labeled and refrigerated for delivery under chain-r.;!-custody to (be laboratory. Label <br /> • _ information should include a sample identification number,job identification number,date,time, <br /> Of analysis requested,and the sampler's name, type <br /> For quality control purposes,a duplicate water sample is collected from each well. <br /> ® sample <br /> is put on hold at the laboratory. A trip blank is prepared at the laboratory and placed in the is <br /> cooler. It remains with the cooler and is analyzed by the laboratory along with the groundwater samples, <br /> A field blank is prepared in the field when sampling equipmentis not dediraled. The field blank i <br /> Prepared after a pump or bailer has been steam-cleaned,prior to use in a second well,and is analyzed <br /> along with the other samples. The field blank demonstrates the quality of in-field cleaning procedures <br /> ® to prevent cross-contamination. <br /> To minimize the potential for cross-contamination between wells,all the n;r <br /> a <br /> nt <br /> well-developmee <br /> water-sampling equipment that is not dedicated to a well is steam-cleaned between each wcUt a <br /> second precautionary measure, wells will be sampled in order of]cast to highest coticcntnions as <br /> established by previous analyses. <br /> l �- <br /> SOPS;Nw/89 <br /> t�- <br /> ( <br />