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WLSTERN RESOURCE- S , INC . <br /> p► - <br /> i - <br /> -, STANDARD OPERATING PROCEDURES <br /> r RE:GROUNDWATER PURGING AND SAMPLING <br /> SOP-4 <br /> Prior to water samp' g,each well is purged by evacuating a minimum of three well-casing <br /> r` volumes of groundwate o til the discharge water temperature,conductivity,and pH stabilize. ThY <br /> rte' groundwater sample should be taken when the water level in the well recovers to Stl%of its static Ievel <br /> The sampling equipment used consists of either a teflon bailer or a stainless steel bladder pump <br /> with a tefloa bladder. If the sampling system is dedicated to the well,then the bailey is made of teflon, <br /> ' but the bladder pump is PVC with a polypropylene bladder. ]Fork;milliliter(ml)glass volatile-nrgeaic- <br /> analysis(VOA)vials,with teflon septa,are used as sample containers <br /> The groundwater sample is decanted into each VOA vial in such a manner that there is a <br /> meniscus at the top of the vial. The rapis quickly plveed over the top of the vial and securely tightened. <br /> r�x The VOA vial is then inverted and tripped to sce if air bubbles are present. If none are present,the <br /> sample is labeled and refrigerated for delivery under chain-of-custody to the laboratory. Label <br /> information should include a sn.-nple identification number„ob identification number,dal;,time,type <br /> of analysis requested,and the sampler's name. <br /> For qualivy control purposes,a duplicate water sample is collected from each well. This sample <br /> is put on hold at the laboratory. A trip blank is prepared at the laboratory and placed in the transport <br /> s 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 equipment is not dedicated. The field blank is <br /> re ared alter r <br /> um o bail <br /> P P bailer <br /> has Leen s <br /> pump team cleave � <br /> d.prior to use in a second we and is <br /> P analyzed <br /> Y <br /> along with the other samples. The field blank demonstrates the quality of L-field cleaning procedures <br /> to prevent cross-contamination. <br /> tl To minimize the potential for crass-contamination between wells,all the well-dcvelapmeet and <br /> water-sampling equipment that is not dedicated to a well is steam-cleaned between each well. As a <br /> second precautionary measure, wells will be sampled in order of least to highest concentrations as <br /> established by previous analyses. <br /> 1� <br /> .......... <br /> - <br /> - SOu4;Nar189 <br />