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AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURE RE: GROUNDWATER PURGING AND SAMPLING SOP-7 Prior to water sampling, each well is purged by evacuating a minimurn of three well-bore volumes of groundwater. When required, purging will col-Itinue until either the discharge water temperature, conductivity or pH stabilize, a maximum of ten well-bore volumes of groundwater have been recovered or the well is bailed dry, When practical, the groundwater sample should be taken when the water level[in the well recovers to at least 80 percent of its static level. The sampling equipment consists of either a Teflon bailer, PVC bailer, or stainless steel ling system is dedicated to the well,then bladder pump with a Teflon bladder. If the samp p is PVC with a polypropylene bladder. the bailer is usually Teflon, but the bladder pum 40-milliliter glass, volatile nded laboratory analysis, In general and depending on the inte pie containers. organic analyzer (VOA) vials, with Teflon septa, are used as sam VOA vial in such a manner that there is The groundwater sample is decanted into each I Th no meniscus at the top of the via]. A cap is quickly secured to the top of the via e and gently tapped to see if air bubbles are present. If none are vial is then inverted elivery, under strict chain-of-custody, to rigerated for d present, the vial is labeled and ref ique sample identification aboratory. Label information should include a un the analytical I type of analysis requested, and the number, job identification number, date, time, sampler's name. ample is collected from each well. This For quality control purposes, a duplicate water s sample is put on hold at the laboratory. When required, a trip blank is prepar d at the laboratory and placed in the transport cooler. It is labeled similar to the well samples, remains in the coo!er during transport, and is analyzed by the laboratory along with the groundwater samples. In addition, a field blank may be prepared in the field when a pump or bailer t is not dedicated. The field blank is prepared after sampling equipmen hed, prior to use in the next well, and is -cleaned or properly was has been either steam field blank analysis demonstrates the analyzed along with the other samples. The ss-contamination. effectiveness of the in-field cleaning procedures to prevent cro To minimize the potential for cross-contamination between wells,all well development and ated to a well is either steam-cleaned or properly water sampling equipment not dedic nd precautionary measure, wells are sampled in order washed between use. As a seco previous analyses. of least to highest concentrations as established by available ATTACHMENTISOP-71FEBRUARY 1992