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0 <br /> .a <br /> AEGIS ENIVIRoMONTAL, INC. <br /> STANDARD OPERATING PROCE'D= <br /> RE: GROUNDWATER PURG17ZG AND BA11PLING <br /> SOP-7 <br /> Prior to water sampling, each well is purged by evacuating a <br /> minimum of three well-bore volumes of groundwater. When required, <br /> pursing will continue until either the discharge water temperature, <br /> conductivity or pH stabilize, a maximum, of ten well-bore volumes of <br /> been recovere <br /> d or the well <br /> groundwater haveis bailed dry. When <br /> practical, the groundwater sample should be taken when the water <br /> level in the well recovers to at least 80% of its static level. <br /> The sampling equipment consists of either a Teflon bailer, PVC <br /> bailer or stainless steel bladder pump with a Teflon bladder. If <br /> the sampling system is dedicated to the well, then the bailer is <br /> usually Teflon, but the bladder pump is PVC with a polypropylene <br /> bladder. In general and depending on the intended laboratory <br /> analysis, forty-milliliter (ml) glass, :►alatile«organic-analysis <br /> (VOA) vials, with Teflon septa, are used as sample containers. <br /> The groundwater sample is decanted into each VOA vial in such a <br /> manner that there is no meniscus at the top of the vial. A cap is <br /> quickly secured to the top of the ubbles are present.vial. The vial is �Tf Wane are <br /> en inverted <br /> 1 tapped to see if air and gently pp <br /> y <br /> g der <br /> present, the vial is labeled and refrigerated far delivery, un <br /> strict chain-of-custody, to the analytical laboratory. Label <br /> information should include a unique sample identification number, <br /> job identification number, date, time, 'type of analysis requested <br /> and the sampler's name. <br /> For quality control purp•:)ses, a duplicate water sample is collected <br /> from each,well. This sample is put on hold at the the <br /> bcrato laboratory. <br /> When required, a trip blank. is pre�aared at laboratory <br /> and <br /> placed in the transport cooler. it is labeled similar to the well <br /> samples, remains in the cooler during transpart and is analyzed by <br /> the laboratory along with the groundwater samples. In addition, a <br /> field blank may be prepared in the field when sampling ecpaor bailer <br /> t is <br /> not dedicated. The Field blank is prepared after a pump <br /> has been either steam cleaned or properly washed, prior to use in <br /> the next well, and is analyzed along with the other samples. The <br /> field blank analysis demonstrates the effectiveness of the in-field <br /> cleaning procedures to prevent cross-contamination. <br /> To minimize the potential for cross-contaminationno a dedicated wlls, <br /> all well developinent and water sampling equip <br /> a well is either steam cleaned or properly washed between use. AS <br /> a secc,nd precautionary measure, wells are sampled in order of least <br /> to hic;hest concentrations as established by available previous <br /> analyses. <br /> —- SOP-7/OCL. 1490 <br /> E <br />